B08_System_Analysis_-_DENA.pdf

670 W. Fireweed Ln, Ste 200 Anchorage, AK (907) 276-0521 l www.rsa-ak.com

Mechanical & Electrical Engineers

September 19, 2022

United States Department of the Interior National Park Service Denver Service Center 12795 W. Alameda Parkway P.O. Box 25287 Denver, CO 80225-0287

ATTENTION: Simon Evans

Dear Simon, REFERENCE: NPS Arc Flash Evaluation - DENALI Trip Report

On 4/18/22 through 4/21/22 and 6/13/22 through 6/15/22 Billy Comer, with Consolidated Contracting, Connor Zietlow, with RSA Engineering, and Caleb Kopp with RSA Engineering travelled to Denali National Park and the National Park Service facilities in Talkeetna to investigate the electrical distribution systems. Connor also travelled back to Denali National Park on 8/9/22 to finalize the data gathering for this report. The intent of the site visits were to gather enough information on the equipment to provide an accurate arc flash calculation and provide warning labels for the equipment and determine any code deficiencies. Any equipment which is single phase and 240V, or less, an arc flash calculation is not required. See one-line diagrams for further information on site electrical systems. The following report will address any code issues we discovered as part of our investigation.

Concessions A-Frames Units 1-6:

The Concessions A-Frame Units 1-6 consist of (6) A-Frame cabins fed from a pad mounted distribution panel, ‘MDP3’, see below B530. Located on MDP3 are (3) 100A 2-Pole Circuit Breakers.

Each of these breakers we assume feeds a 200A 3-Pole fused disconnect with 200A fuses. These fused disconnects are mounted on a plywood backboard located between building B530 and the Concession Condos. The farthest left disconnect feeds each of the Concessions Cabin Units 1-5, see below. The central-Left disconnect feeds each of the A-Frame Units 1-6. The central-right disconnect, we assumed feeds each of the Concession Condo Units 1-32 & NPS Condo Units 33- 48, see below, due to lack of readable markings on the disconnect housing and that it was unable to be opened. The feeds from the disconnects Concessions Condos and Cabins are distributed via multiple splice cabinets mounted at a variety of heights on 4’x4’ wooden posts distributed throughout the concession area. The feed to the A-Frame Units from the fused central-left disconnect goes into a 4’x4’ wooden post mounted panel, denoted panel ‘A-Frame DP’. Panel ‘A-Frame DP’ we assume, due to warn out labeling, is a 200A, Square D type NQ panelboard with a 200A 3-Pole MCB. Through

(2) 100A, 2-Pole and (4) 125A 2-Pole breakers, panel ‘A-Frame DP’ feeds directly into A-Frame units 3 and 5, and units 1,2,4, and 6 respectively to a single recess-mounted 100A, 120/208V, 1Ø Panel mounted on the interior of the cabin that is on the left side of the front door. The panels in units 1-3 have a 100A 2-Pole main circuit breaker (MCB) each, and the panels in units 4-6 are main lug only

(MLO).

The following are issues we noted with the distribution system:

1. ‘A-Frame Dist’ Units 1-3 all have a staircase within the working clearance of the panel. If the buildings are not going to be demolished, the panels must be relocated to provide 3’ in front of the panel.

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2. Units 2 and 3 have no ground bar and the equipment grounding conductors (EGC) are terminated on Neutral Bar. Recommend providing ground bar in panel and moving all ground wire on neutral bar to new ground bar.

3. Units 2-6 are not bonded to the ground rod located outside of the units. Recommend bonding ground bar to ground rod driven into the ground.

4. Units 4-6 have no disconnecting means. Recommend intercepting incoming feed to panels and providing 100A, 2-pole circuit breaker or fused disconnect in line with incoming service conductors. The bond required in item 3 will need to be done within the ground lug of this disconnect.

5. The panel ‘A-Frame DP’ is old, dented, and missing panel information. Breakers for units 1,2,4 and 6 are rated at 125A and using #2 AWG Cu to feed each cabin. With a 100A 2-Pole disconnect on each of these cabins. Recommend replacing panel with similar style of panel, and breakers for cabins 1,2,4 and 6, with 100A 2-Pole breakers rated for use in the panel.

6. Fused disconnects for units are mounted on an unstable backboard. Recommend resetting or stabilizing backboard to prevent it from collapsing in the future.

7. Fused disconnect mounted farthest to the right is not in use but has hot conductors entering the line side of the disconnect. Recommend providing lockout for the disconnect to prevent unwanted access.

Concessions Area Bus Barn/Shop B530:

Behind the Concessions Area Bus Barn/Shop building is GVEAs primary distribution line to a Utility Distribution transformer rated at 300KVA, 277/480V, 3Ø which feeds the concessions area of the park. The service entrance equipment for the Employee Dining Hall B546 is located behind the Concession Area Bus Barn/Shop and consists of a CT cabinet with separate meterbase and a 200A, 3-pole fused disconnect with 175A fuses feeding a 112.5kVA, 480V:120/208V, 3Ø pad-mounted transformer designated, 'Employee Dining Hall Transformer’, see B546 below. The service entrance equipment for the main distribution panel, ‘MPD1’, a 277/480V, 600A, 3Ø Square D type I-Line panel with main lugs, consists of a CT cabinet with meterbase and a 600A 3-Pole fused disconnect with 600A fuses. The fused disconnect feeds ‘MDP1’. 'MDP1’ feeds a 225kVA, 480V:120/208V, 3Ø transformer, for ‘MDP3’, see B526 below, the ‘Bus Dispatch Transformer’ see B583 below, and the 225kVA, 480V:120/208V, 3Ø ‘Bus Barn/Shop Transformer’. The ‘Bus Barn/Shop Transformer’ feeds a surface-mounted 600A, 120/208V, 3Ø Square D type I-Line distribution panel for the Bus Barn/Shop with a 600A 3-Pole MCB. Panel ‘MDP’ feeds a 30A Eaton unlabeled safety switch feeding the air compressor in the mechanical room which was unable to be opened, which was assumed to be unfused based on location of switch and upstream breaker, via a 60A 3-Pole breaker; Panel ‘A’ a surface-mounted 120/208V, 225A, 3Ø Square D type NQOD with main lugs, with a 225A, 3-pole breaker; panel ‘B’, a surface-mounted 120/208V, 100A, 3Ø Square D type NQOD with main lugs, with a 100A, 3-pole breaker; panel ‘C’, a surface-mounted 120/208V, 225A, 1Ø Cuttler Hammer type PB with a 225A 2-Pole Main Circuit Breaker (MCB), and panel ‘D’, a surface-mounted 120/208V, 125A, 3Ø Siemens type A-series 2 with main lugs, with 70A, 3-pole breaker; and panel ‘E’, a surface-mounted Square D 120/208V, 225A, 3Ø type NQ with main lugs, with 225A, 3-pole breaker. Panel ‘A’ sub feeds a 30A Square D floor exhaust safety switch that was unable to be opened. Based on similar equipment in the area, the safety switch is assumed to be fused with 30A fuses. Panel ‘C’ sub-feeds panel designated ‘Sub D’, which we will refer to as Panel ‘Sub C’, with a 100A 2-Pole breaker. Panel ‘Sub C’ is a 120/208V, 125A, 1Ø Cutler Hammer type PB with main lugs. Located in the mechanical room are (2) 30A, 3Ø Square D safety switches with 20A fuses which are abandoned in place, labeled CP-1 and CP-2.

1. In Panel ‘A’ there are (3) #12 AWG Cu wires landed on a breaker in space 18. Type QO breakers are not rated for terminating more than 2 #12 AWG Cu wires per lug. Recommend intercepting and splicing incoming circuits to terminate a single #12 AWG Cu pig tail conductor on the breaker.

2. Panel ‘D’ is fed using (3) #6 AWG Cu wires which are rated for only 55A and are undersized for 70A breaker. Replace feeders to Panel 'D' with wire rated for 70A or greater. Alternately do a load data log and determine if a 60A breaker would be adequate for the load.

8. Panel ‘C’ has no ground bar and the EGC’s are terminated on Neutral Bar. Recommend providing ground bar in panel and moving all ground wire on neutral bar to new ground bar.

3. Panel ‘Sub D’ is fed from the panel C. Recommend relabeling panel as ‘Sub C’ to avoid confusion.

4. Fused disconnects in mechanical room are abandoned in place. Recommend removing and salvaging them for later use.

Concessions Bus Dispatch Building B583:

The Concession Bus Dispatch building consists of a 600A 3-Pole fused disconnect with 400A fuses mounted on a plywood backboard located outside of the Concessions Dispatch building fed from the ‘Bus Dispatch Transformer’, a 150kVA, 480V:120/208V, 3Ø transformer located outside the Concession Bus Dispatch Building, see B530 above. The fused disconnect feeds the surface-mounted 120/208V, 400A, 3Ø Square D type HCN Bus Dispatch distribution panel, denoted ‘Bus Dispatch MDP’. From the ‘Bus Dispatch MDP’ a 150A breaker feeds the ‘Bus Dispatch Panel’, a recess-mounted 120/208V, 225A, 3Ø Square D type QO Load Center with main lugs, located inside of building B583. The other 225A 3-Pole breaker on ‘Bus Dispatch MDP’ feeds the Concession Maintenance building, see below B639.

1. The ground bonding tap for the 600A, 3-Pole fused disconnect is not fastened to the disconnect enclosure. Recommend reattaching the tap to the housing of the disconnect.

Concessions Cabin Units 1-5:

The Concessions Cabin Units 1-5 consist of (5) cabin units fed from (1) 200A 3-Pole fused disconnect with 200A fuses, via multiple splice cabinets mounted on 4’x4’ wooden posts distributed throughout the area. From the splice cabinets near the cabin units, the incoming feed from the associated disconnect is tapped off and use to feed (1) surface-mounted 120/208, 100A, 1Ø Square D type QO Load Center with main lugs mounted on the exterior of each cabin.

1. Cabin Units 1-5 all have no ground bar, and the EGC are terminated on Neutral Bar and are missing a ground rod to bond panel ground to earth ground. Recommend providing new ground bar in panel, moving all ground wire on neutral bar to new ground bar, and bonding new ground bar in panel to new ground rod with #4 bare copper ground.

2. Cabin Unit 5 incoming feed to its panel has been broken. The panel is now being fed with S.O. cord slightly buried underground from a nearby splice cabinet. Recommend replacing Cabin Unit 5’s incoming feed with new conduit and conductors, (3)#2 AWG Cu and (1)#8 AWG Cu ground in 1.25” conduit.

3. Cabin Unit 2 has a breaker located on the main bus bar that is off set from the bus bar.

Recommend replacing breaker or rerouting conductors in panel to allow breaker to sit flush on bus bar.

4. Splice box outside of Cabin Units 3 & 4 is a splice cabinet that has been crushed and is unusable. Recommend replacing cabinet with new enclosure rated NEMA 3R and remounting on a new 4”x4” post in the ground.

Concessions Condo Units 1-32:

The Concessions Condo Units 1-32 consist of 8 buildings with (4) condos each, fed from (1) 200A 3-Pole fused disconnect with 200A fuses, via multiple splice cabinets mounted on 4”x4” wooden posts distributed throughout the area. From the splice cabinets near the condo buildings, the incoming feed from the associated disconnect is tapped off and use to feed (1) surface-mounted 120/208, 100A, 1Ø Square D type QO Load Center with main lugs mounted on the exterior of each condo. The panel located on the exterior of condo units 1-8 and 13-32 all had (1) 100A 2-Pole MCB located in the panel, while units 9-12, had (1) 200A 2-Pole MCB located in the panel.

1. The panels for all the units have the same issues. For each panel there are neutral designated wires used as current carrying conductors, the panels are mounted above 6’7” to highest breaker position, and the panels are all heaved off center from the incoming feeder conduit. Recommend designating neutral conductors as current carrying conductors on each end, using approved means and methods. To fix working height recommend bringing in of gravel or dirt to bring ground level 6” up to make the height of the highest breaker position within 6’7” AFG, building 1' tall platform beneath panel, or relocating panel to bring height of highest breaker position within 6’7” to AFG or AFF and replace incoming conduit with approved liquid tight conduit to avoid future issues. Recommend releveling each panel after working height issue is rectified.

2. The panels located on the exterior of Condo Units 5-8 have been badly damaged and need to be replaced.

3. The panels located on the exterior of Condo Units 29-32 have been heaved off the exterior wall. Recommend refastening panel and associated incoming conduit to wall.

Concessions Employee Dining Hall B546:

The Concessions Employee Dining Hall building consists of a surface-mounted, 120/208V, 400A, 3Ø Square D type I-Line distribution panel with main lugs, designated ‘Dining Hall Disconnects’ and fed from the ‘Employee Dining Hall Transformer’, mentioned previously, see B530 above. Two 150A 3-Pole circuit breakers feed panels ‘DB’ and ‘K1’, both 120/208V, 225A, 3Ø Square D type NQOD panels. Two 100A 3-Pole circuit breakers feed panels ‘DA’ and ‘K2’, both 120/208V, 225A, 3Ø Square D type NQOD panels.

1. Panels ‘DB’ and ‘K2’ have circuits sharing neutrals. Recommend providing breaker ties for all circuits sharing neutrals.

Concessions Erratic Bathhouse B526:

The Concessions Erratic Bathhouse building consists of a 400A 3-Pole fused disconnect with 300A fuses mounted on the exterior of the bathhouse, fed from the 120/208V, 600A, 3Ø Square D type I-line with a 600A 3-Pole MCB, panel ‘MDP3’ located in front of the Midnight Sun and Northern Lights dorms. ‘MDP3’ in turn is fed from the 225kVA 480V:120/208V, 3Ø transformer, for ‘MDP3’, see B530 above. The Erratic Bathhouse disconnect feeds a surface-mounted 120/208V, 400A, 3Ø Square D type NQOD with main lugs, designated panel ‘MDP Erratics’. Panel ‘MDP Erratics’ in turn sub feeds

(2) surface-mounted panels in the same room, panel ‘Erratics 1’, a 120/208V, 125A, 3Ø GE type A Series 2 with 60A, 2-Pole MCB, and panel ‘Erratics 2’, a 120/208V, 1Ø Square D Load Center with no bus rating noted. We assume Panel ‘Erratics 2’ is the same rating as ‘Erratics 1’.

1. Panel ‘Erratics 2’ had no disconnecting means, no ground bar, no grounding in the panel, and was missing general labeling. Recommend replacing panel with new similar panel with ground bar and MCB rated to protect panel feeders, as well as provide proper grounding wire to panel and circuits.

2. Panel ‘MDP3’ has bare copper in enclosure. Recommend demolishing copper back to source.

Concessions Horseshoe Creek Pizza B126:

The Concessions Horseshoe Creek Pizza building consists of a 112.5kVA 480V:120/208V, 3Ø pad mounted transformer located in front of the bus lot, designated ‘Bus Lot Transformer’. We assume that this transformer is fed from, based on maintenance personnel information and no visible disconnects or feeders directly to this transformer, a tap on the primary side of the ‘Bus Dispatch Transformer’, see B530 and B583. The ’Bus Lot Transformer’ feeds a 200A 3-Pole fused disconnect with 200A fuses, mounted to a plywood back board in front of the bus lot, a Square D type NQOD panel feeding the lighting in the bus lot, designated panel ‘EXT’, and an MTS located in front of the Bus Barn B530, see above. The 200A fused disconnect feeds underground to distribution panel located on the exterior of B126, designated panel ‘A’. Panel ‘A’ is a 120/208V, 225A, 3Ø Square D type NQOD with a 200A 3-Pole MCB. Panel ‘A’ feeds (3) panels. Panel ‘Kitchen’, a 120/208V, 100A, 3Ø Square D type NQ panel via a 100A 3-Pole breaker. Panel ‘West’, a 120/208V, 1Ø Square D type QO Load Center with no visible bus rating and main lugs via a 50A 2-Pole breaker. Panel ‘East’, a 120/208V, 1Ø Square D type QO Load Center with no visible bus rating and main lugs is fed from the same 50A, 2-pole breaker in Panel ‘A’. Per information provided to us by NPS, there was a 200A, 120/208V, 3Ø panel board located in the storage room of the building. After talking with site personnel and site investigation this panel was determined to not exist. The MTS is a 100A 1Ø Square D double throw enclosed switch. The emergency side of the MTS is connected to a 50A, 125/250V weatherproof plug mounted near the MTS for connection to a portable generator. The MTS feeds a 125A, 120/240V, 1Ø Square D type QO load center with a 100A MCB, designated panel ‘Fuel’, which in turn feeds a 100A, 120/240V, 1Ø Square D type QO load center with main lugs, designated panel ‘Fuel Shut Off’. Panel ‘Fuel Shut Off’ has an emergency fuel shut off button connected to a 20A 2-Pole breaker located on its bus which shuts off power to the fueling pump located in front of the bus barn.

1. Near ‘Bus Lot Transformer’ is an abandoned feeder stubbed from underground. Recommend demolishing cabling to source and capping conduit to prevent ingress of water or debris.

2. Panel ‘East’ and ‘West’ do not have ground bars or EGC to circuits. Recommend providing ground bar and ground wires to downstream devices.

3. Panel ‘EXT’ needs a means of disconnect and needs its neutral and ground bars bonded together. Recommend intercepting feed and providing 3-Pole disconnect rated for use in the panel and trip rating greater than or equal to amperage draw required for panel.

4. Fuel panel MTS and Panel ‘Fuel’ is fed with #6 AWG Cu. Conductors are not rated for the ampacity of the breaker. Replace feeders to panel 'Fuel' with wire rated for 100A or greater.

Alternately do a load data log and determine if a 60A breaker would be adequate for the load.

Concession Maintenance Building B639:

The Concessions Maintenance building service terminates at a modular metering system rated at 120/208V, 1200A Bus Rating, 400A Branch Rating, 3Ø Siemens Meter Stack with a 250A 3-Pole breaker fed from ‘Bus Dispatch MDP’, see B583 above. The Meter Stack feeds Panel ‘A’, a 120/208V, 225A, 3Ø Siemens type Indoor Load Center with a 225A, 3-Pole MCB, and a 200A 3- Pole fused disconnect with 125A fuses, denoted Panel ‘C’ Disconnect. Panel ‘A’ sub feeds panel ‘B’, a 120/208V, 100A, 3Ø Siemens type Indoor Load Center with a 100A 3-Pole MCB. The fused disconnect feeds a 45kVA 208V:277/480V, 3Ø pad mounted Eaton Dry-Type Distribution step-up transformer providing a higher voltage to the exterior surface mounted panel ‘C’, a 277/480V, 100A, 3Ø Eaton type PRL2a panel with 70A 3-Pole MCB.

1. Panel ‘A’ has no ground bar, and the EGC are terminated on Neutral Bar. Recommend providing new ground bar in panel and moving all ground wire on neutral bar to new ground bar.

Concession Meadows Men/Women’s Bathroom B525:

The Concessions Meadows Men/Women’s Bathroom was unable to be accessed during this study, as it was inaccessible due to snow during the first site visit and being used for a covid quarantine zone during the second.

1. About 150’ away from the Men’s and Women’s bathrooms in the woods is an abandoned junction box with abandoned wires and conduit. Recommend demolishing wire and junction box and providing conduit caps for underground conduit.

Concession Midnight Sun Employee Dorm Building S523:

The Concessions Midnight Sun Employee Dorm building is fed from a 125A 2-Pole circuit breaker located on ‘MDP3’, see B526 above. The feed goes to panel ‘MS’, a surface-mounted 120/208V, 225A, 1Ø Square D type QO Load Center with a 225A 2-Pole MCB with no make or type markings visible, located on the exterior of the dorm.

1. Panel ‘MS’ enclosure cover is dented, misshaped and has branch circuits sharing neutrals.

Recommend replacing enclosure cover and providing breaker ties to branch circuits sharing neutrals in accordance with the NEC.

Concession Northern Lights Employee Dorm Building S522:

The Concessions Northern Lights Employee Dorm building consists of a 125A 3-Pole Square D Thermal-Magnetic Circuit Breaker located on ‘MDP3’, see B526 above, feeding to (1) surface-mounted 120/208V, 225A, 1Ø Square D type QO Load Center with a 225A 2-Pole MCB with no make or type markings visible, located on the exterior of the dorm.

1. Thermal-Magnetic Circuit Breaker located on panel ‘MDP3’ is a 3Ø breaker feeding a 1Ø panel. Recommend replacing circuit breaker on ’MDP3’ with a 125A 2-Pole Square D Thermal-Magnetic Circuit Breaker.

Denali Bus Depot B91 Concessions:

The Denali Bus Depot building service entrance equipment consists of a GVEA utility feed to a pad mounted transformer. The transformer feeds a 120/208V 400A 3-Pole GE service disconnect via a utility CT cabinet, remotely metered. The service disconnect feeds a 70A 2-Pole combo meter disconnect (CMD) which is monitored by a NPS meter feeding an exterior building near the Bus Depot that feeds the BIC building, see below, and Panel ‘P’ 120/208V, 400A, 3Ø panel board, assumed 400A based on service disconnect size and lack of clear labeling on panel. Panel ‘P’ feeds panel ‘PB’ a 120/208V, 125A, 3Ø GE type A series, via a 90A 3-Pole circuit breaker. Panel ‘P’ also feeds panel ‘N’ a 120/208V, 125A 3Ø, GE type A series 2. Panel ‘N’ is fed via a 100A 3-Pole circuit breaker. Panel ‘P’ also feeds panel ‘M’ a 120/208V, 225A 3Ø, GE type Q panelboard, assumed 225A from breaker size and lack of clear panel labeling. Panel ‘M’ is fed via a 200A 3-Pole circuit breaker.

Panel ‘M’ subfeeds a 15A 3-Pole enclosed circuit breaker for AHU-1 located in the mechanical room from what appears to be a 70A 3-Pole breaker based off signage on front of AHU-1’s disconnect.

Panel ‘PB’ feeds subpanel ’PB’ a 120/208V, 3Ø Square D type QO load center, panelboard. Panel ‘PB’ is fed via a 50A 3-Pole circuit breaker. Located in the mechanical room are (2) fused disconnects with 20A fuses for pumps #3A and 3 which are abandoned in place.

1. Panel ‘PB’ has no ground bar. EGC’s are terminated on neutral bar. Provide ground bar in panel. Move all ground wires to new ground bar.

2. The enclosed circuit breaker directly feeding the disconnect for AHU-1 has the label “ELECTRIC UNIT HEATER M-44”. Further site investigation is required to determine if this is fed from the panel ‘M’ and circuit 44. If so, the circuit breaker located on panel ‘M’ is oversized for the conductors that it is feeding and needs to be replaced with a 30A 3-Pole breaker rated for use in the panel. If panel ‘M’ circuit 44 is not feeding the enclosed circuit breaker, then the signage on said breaker must be replaced with signage to accurately reflect installation.

3. Fused disconnects in mechanical room are abandoned in place. Recommend removing and salvaging them for later use.

Backcountry Information Center (BIC):

The BIC building consists of an exterior mounted CMD with a 70A 2-Pole circuit breaker surface-mounted on the exterior of B91, see above. The CMD feeds a splice box adjacent, which is fed through to another splice box located outside of the BIC building, which in turn feeds a surface-mounted 100A, 120/240V, 1Ø Square D type QO load center with main lugs, designated ‘BIC Storage’, building disconnect located in the storage area of the building. ‘BIC Storage’ feeds a panel with no visible bus rating, assumed to be a 100A, 120/240V, 3Ø Square D type QO load center with main lugs, designated ‘BIC Office’ from a 60A 2-Pole MCB.

1. Panel ‘BIC Storage’ has a ground wire terminated on (2) lugs of the grounding bar.

Recommend providing new reducer to allow for ground wire to be terminated on only one lug of the ground bar.

2. Panel ‘BIC Office’ is fed with 3 legs of power. Further site investigation is required to determine where the third leg is fed from. Recommend replacing panel with 100A, 120/240V, 1Ø Square D type QO load center.

3. Panel ‘BIC Office’ is missing breaker blanks at each third space. A work order was submitted during the site visit to rectify this issue.

4. Panel ‘BIC Office’ has a wall mounted desk violating the working clearance of the panel and has no visible markings of panel ratings. Recommend removing desk and relocating across the room from its original location and providing new designation as to clarify panel bus rating.

5. Outside of the BIC is a splice box with a welded hole in the cover from an unprotected conductor splice and a broken PVC conduit feeding the panel ‘BIC Storage’. Provide Polaris connectors or approved equal splice connectors for all connections in splice cabinet and replace splice cabinet enclosure cover. Also replace broken PVC conduit underneath building for feeders to ‘BIC Storage’ panel.

Denali Visitor Center B548:

The Denali Visitor Center building consists of the Powerhouse building B140 where a GVEA service transformer brings power to a 277/480V, 1200A, 3Ø Siemens type SB3 switchboard with a 1000A MCB, and a surface-mounted exterior meterbase for building B550, see below. The main switchboard has a 600A 3-Pole breaker and a 500A 3-Pole breaker, that have no identifiable markings, and sub feed the Power House Area (A.R.A.) ATS and the HQ. CCC Camp ATS respectively. GVEA meters power usage in this main switchboard for the Power House Area and the HQ. CCC Camp here. The Power House Area ATS and the HQ. CCC Camp ATS are both 600A, 277/480V, 3Ø Cummins Onan model OT automatic transfer switches which have their emergency side fed by the emergency switchboard designated ‘Emer Power Dist SWBD’, a 277/480V, 1200A, 3Ø Siemens type SB3 switchboard with a 1000A 3-Pole Siemens Sentron Series type ND6 MCB.

The ’Emer Power Dist SWBD’ has a 500A 3-Pole breaker and a 600A 3-Pole breaker feeding the HQ. CCC Camp ATS and the Power House Area ATS, respectively. ‘Emer Power Dist SWBD’ is fed by a 750kVA, 277/480V, 3Ø Cumming Onon Gen Set. From the two ATS’s, emergency power is provided for C-Camp, HQ, A.R.A., Denali Visitor Center, the MSLC, and the MTA Telecom Hut, mentioned later. Providing power to the Denali Visitor Center is a surface-mounted, 200A 3-Pole Square D fused disconnect with 200A TRS200R fuses, on the exterior of the powerhouse building designated ‘Visitor Center Main Disconnect’. We assume that this fused disconnect is fed from a tap on the primary side of the 300kVA, 480V:12470V, 3Ø transformer designated, ‘HQ and C-Camp transformer’, which is pad mounted outside of the powerhouse, based on maintenance personnel information and lack of visible connection points or feeders directly to this disconnect. ‘HQ and C- Camp transformer’ then distributes power at medium voltage to all of C-Camp and HQ. The ‘Visitor Center Main Disconnect’ feeds the Visitor Center transformer, a 112.5kVA, 480:120/208V, 3Ø Square D pad mounted step-down transformer. The Visitor Center transformer feeds a 400A 3-Pole building disconnect, surface-mounted on the exterior of the visitor center and denoted ‘Visitor Center Service Disconnect’. The ‘Visitor Center Service Disconnect’ feeds the panel ‘MDP’, a 120/208V, 400A, 3Ø Square D type NF panelboard with (3) breakers sub feeding to Panels ‘CS’, ‘BS’, and ‘VS’.

Panel ‘CS’ is fed by a 50A 3-Pole breaker, Panel ‘BS’ is fed by a 40A 3-Pole breaker, and Panel ‘VS’ is fed by a 250A 3-Pole breaker via a CT cabinet with a remote meter. For Panels ‘CS’ and ‘BS’ see below, B549 and B552, respectively. Panel ‘VS’ is a 120/208V, 400A, 3Ø Square D type NQOD sub feeding panels ‘V1’, ‘V2’, and ‘V3’, all of which are 120/208V, 225A, 3Ø Square D type NQOD panelboards with main lugs. A 100A 3-Pole breaker is feeding panel ‘V1’, a 90A 3-Pole breaker is feeding panel ‘V2’, and a 60A 3-Pole breaker is feeding panel ‘V3’.

The are no issues we noted with the distribution system.

Denali Visitor Center Baggage Storage B552 Concessions:

The Denali Visitor Center Baggage Storage building consists of Panel ‘BS’, a 120/208, 90A, 3Ø Square D type NQOD panelboard with a 90A 3-Pole MCB, fed by Panel ‘MDP’ located in the Denali Visitor Center, see above B548.

1. Panel ‘BS’ has a 90A/3P MCB. The next upstream disconnect on panel ‘MDP’ is 40A/2P.

Recommend replacing MCB on panel ‘BS’ with breaker closer to amperage of disconnect on upstream panel.

Denali Visitor Center Comfort Station B549:

The Denali Visitor Center Comfort Station consists of Panel ‘CS’, a 120/208V, 40A, 3Ø Square D type NQOD panelboard with a 3-Pole MCB, fed by panel ‘MDP’ located in the Denali Visitor Center, see above B548.

1. Panel ‘CS’ is labeled 120/240V on the panel schedule located in the panel. Recommend altering the panel schedule to ‘120/208V, 3Ø, 4W to reflect 3Ø nature of panel.

Front Country Buildings B641, B642 and B634:

The Front Country Wastewater buildings consist of the Chlorination and De-Chlorination buildings, B641 and B642 which both have both with surface-mounted 120/240V, 125A, 1Ø Square D type QO Load Center panels with 50A 2-Pole MCB’s located on the exterior of each building assumed to be fed by GVEA service equipment consisting of utility transformer ‘XFMR 240’, a 25 KVA utility distribution voltage:120/240V, 1Ø transformer, near the entrance to the facility, due to no visible connection points outside of the panels. The Chlorination and De-Chlorination buildings are remotely metered from surface-mounted meter located adjacent each panel. ‘XFMR 240’ also feeds panel ‘A’, a surface-mounted 120/240V, 250A, 1Ø Siemens type S1 panelboard with a 225A MCB located near the service transformer ‘XFMR 240’ and is remotely metered by a GVEA meterbase. Panel ‘A’ feeds a panel designated, ‘Temp Power’, a 125A 120/240V, 1Ø Square D type QO load center with a 50A 2-Pole MCB, from a 50A 2-Pole breaker, and the ‘Generator Control Panel’, a 120/240V, 50A, 1Ø Square D type QO load center with main lugs, with a 60A 2-Pole breaker. B634 is the Front Country Wastewater System Lab building which consists of a 120/240V, 125A, 1Ø Square D type NQ panelboard with integral surge protection and a 125A MCB, panel ‘B’, which is fed from the building we denoted ‘Power Distribution Complex’ via a 25 KVA, 480V:120/240V transformer located adjacent to the panel, and a 100A knife blade disconnect. In the ‘Power Distribution Complex’ is another for the transformer for panel ‘B’ with an unidentifiable size and pole number. Since the utility transformer feeding ‘Generator Switchboard’, designated ‘XFMR 480’ is a 112.5KVA, utility distribution voltage:277/480V, 3Ø transformer, we assumed that the disconnect for the panel ‘B’ transformer located in the power distribution connex was 100A 3-Pole due to the transformers 3Ø nature. The ‘Power Distribution Conex’ is metered from a meterbase located on the exterior of the building. ‘XFMR 480’ also feeds a surface-mounted 277/480V, 250A, 3Ø Siemens type S2 panelboard with a 100A 3-Pole MCB, designated Panel ‘480’ via a remote mounted GVEA meterbase.

Based on conversations with site personnel Panel ‘A’ distribution system is backed up by generator, however during site investigation no evidence of any equipment to make this possible was found.

Further investigation is required to make sure no code deficiencies are present.

There were no issues we noted with this distribution system.

HQ Steam Plant B54 & B262:

The HQ Steam Plant buildings consist of a pad mounted 12470V:120/208V, 3Ø transformer designated ‘Steam Plant transformer’, fed via the medium voltage overhead distribution lines from the power house, see B548. The ‘Steam Plant transformer’ supplies power to a 120/208V, 400A, 3Ø Square D type NQOD panelboard with a 400A 3-Pole MCB, designated Panel ‘P’ and 125A 3-Pole Easton Cutler Hammer disconnect for exterior RV pads designated, ‘RV Disconnect’, metered from an upstream CT cabinet. Panel ‘P’ feeds panels ‘L’, ‘A’, and ‘B’ via a 100A 3-Pole, a 50A 3-Pole, and a 100A 3-Pole breaker respectively. Panel ‘L’ is a 120/208V, 225A, 3Ø GE type NLTO panelboard with a 125A MCB. Panel ‘A’ is a 120/208V, 100A, 3Ø Skyline type NLAB panelboard with main lugs.

Panel ‘B’ is a 120/208V, 225A, 3Ø Square D type MHC panelboard with main lugs with a 30A 2-Pole breaker feeding the ATCO Remote Trailer, B262. B262 consists of a 120/240V, 100A, 1Ø Square D type QO Load Center designated ‘ATCO Remote Trailer’ with main lugs. The ‘RV Disconnect’ feeds

(6) individually metered Eaton CMD with 50A 2-Pole disconnects designated Pads 1-6. Each Pad consists of a 120/240V, 100A, 1Ø Square D Service Pak RV Power Outlet Pedestal Mounted with

(3) receptacles.

1. ‘RV Disconnect’ is using 125A 3-Pole breaker as a disconnect for a 1Ø panel. Recommend replacing 125A 3-Pole breaker with a 125A 2-Pole breaker rated for use in the enclosure.

2. Panel ‘A’ has no ground bar. EGC’s are terminated on neutral bar. Provide a ground bar in the panel. Move all ground wire to new ground bar.

JV Campus Condo Units 33-48, B698, & B699:

The JV Campus Condo Units 33-48 consist of (4) condo buildings fed from a 200A 3-Pole central right disconnect via multiple splice cabinets mounted at a variety of heights on 4’x4’ wooden posts distributed throughout the concession area, see Concessions A-Frames Units 1-6. Each of the (4) condo units consisted of an exterior surface-mounted 120/240V, 1Ø Square D CMD with a 100A 2- Pole MCB. Also fed from the central right disconnect are new cabin units, labeled B698 and B699 which consist of a 120/240V, 1Ø Square D CMD with a 100A 2-Pole MCB. We are assuming based on maintenance personnel information, and lack of access to the interiors of the cabins, that each cabin CMD feeds directly to a 120/240V, 100A, 1Ø Square D type QO Load Center with a 100A 2- Pole MCB.

1. Units 33-40: Condo panels are using neutral denoted wires as conductors and the incoming conduit into the panel is sleeved with a larger conduit. Neutral designated conductors terminating on breakers shall be designated hot on both ends using approved means and methods. Intercept incoming conduit and replace with liquid tight conduit or approved equal to avoid future issues.

2. Units 41-44: Splice cabinet enclosure and backboard is dented and rotten. Replace splice cabinet enclosures with enclosure rated for external use in area. Replace plywood backboard and remount splice cabinet.

3. Units 44-48: Condo Panel is using neutrals denoted wires as conductors, and the incoming conduit into the panel is sleeved with a larger conduit. From this panel is a plug-in extension cord feeding a nearby yurt. Neutral designated conductors terminating on breakers shall be designated hot on both ends using approved means and methods. Intercept incoming conduit and replace with liquid tight conduit or approved equal to avoid future issues. Replace yurt power cord with direct burial cord with locking plugs.

4. B699: Meter base combination disconnect located about +8' AFG. Relocate meterbase combination disconnect down so that disconnect breaker handle does not exceed 6'7" in its highest position.

5. B698: Meter base combination disconnect located about +8' AFG. Relocate metebase combination disconnect down so that disconnect breaker handle does not exceed 6'7" in its highest position.

McKinley Airstrip Fire Management Building B614:

The McKinley Airstrip Fire Management building consists of GVEA service entrance to a pad-mounted service transformer which feeds a backboard mounted 120/240V, 200A, 1Ø Square D Combination Service Entrance Device, denoted ‘NPS Airstrip’ with a 200A 2-Pole breaker for panel designated ‘West Airstrip’. There is a fused disconnect rated 200A, 2Pole, 120/240V, 1Φ fed from this breaker. Panel ‘West Airstrip’ is 120/240V, 200A, 1Ø Square D type QO load center with a 200A 2-Pole MCB, with a 100A 2-Pole breaker feeding a Cuttler Hammer type Circuit Breaker Enclosure with a 100A 3-Pole disconnect designated ‘Emergency Fuel Shutoff’. The ‘Emergency Fuel Shutoff’ disconnect feeds an unmarked panel, designated panel ‘Fuel’ assumed to be a 100A, 120/240V, 1Ø Square D type QO Load Center with main lugs based off breaker types located in panel.

1. ‘Fuel’ panel has no ground bar and is back feeding a conductor back through the disconnect upstream. Recommend demolishing back feeder conductors to source, providing ground bar for panel, moving all EGCs to new ground bar, and replacing the 3-Pole bus connector with a 2-Pole bus connector after removing feeder conductors.

2. ’Emergency Fuel Shutoff’ disconnect is a 3Ø breaker serving a 1Ø panel. Recommend replacing building disconnect with a 100A 2-Pole breaker.

3. Panel ‘West Airstrip’ has either missing insulation or splicing of it’s neutral in the panel.

Recommend cutting cable at splice or insulation gap and splicing using Polaris connector or other approved means and methods.

4. ‘West Airstrip’ Panel has no ground bar and is back feeding a conductor back through the disconnect downstream. Remove feeder conductors back to source. Provide ground bar in panel. Move all ground wire to new Ground bar. Replace 3-Pole bus connector with 2-Pole bus connector after removing feeder conductors back to source.

5. South NPS Fused Disconnect Conductors in and out of 200A/2P fused disconnect are 2/0 Cu which are undersized for OCPD size. Neutral fed to Fuel Pro building disconnect has section of insulation removed and taped over in panel enclosure. Replace incoming and outgoing conductors with (3) #3/0 Cu, and (1) #6 GND Cu. Cut wire where insulation is missing and provide extension to neutral bar using a Polaris connector or other approved means and methods.

6. Junction box adjacent to ‘West Airstrip’ Panel has (3) #2/0 Cu, incoming and outgoing not connected and hot. Disconnect Hot conductors and pull back to source or provide acceptable caps for both sets of conductors.

Marino Grill Food Court & Denali Visitor Center Book Store B550:

The Marino Grill Food Court and Denali Visitor Center Book Store building consists of a GVEA CT cabinet and meterbase, and a 400A, 3Ø Square D disconnect with 250A fuses, designated ‘B550 Disconnect’ located on the exterior of the Power House B140, see Denali Visitor Center B548 above.

The ‘B550 Disconnect’ feeds, what is assumed to be, a pad mounted 200kVA 277/480V:120/208V, 3Ø transformer, denoted ‘Marino Service Transformer’, based off relative size of the MCB on the next downstream panel. The ‘Marino Service Transformer’ feeds a 120/208V, 600A, 3Ø Square D type I-Line panelboard with a 600A 3-Pole MCB, denoted panel ‘FCA’. Panel ‘FCA’ has (3) 100A 3- Pole and (2) 200A 3-Pole circuit breakers feeding panels ‘FCK3’, ‘S’, ‘FCB’, ‘FCK1’, and ‘FCK2’ respectively. All of these are 120/208V, 225A, 3Ø Square D type NQOD with main lugs panelboards, besides panel ‘S’. Panel ‘S’ is located in the Denali Visitor Center Book store and is a 120/208V, 100A, 3Ø Square D type NQOD with a 100A 3-Pole MCB.

1. Panel ‘FCK1’ and ‘FCB’ have circuits sharing neutrals. Recommend providing breaker ties for all circuits sharing neutrals or providing dedicated neutrals for each single pole circuit.

MTA Hut Near Powerhouse:

The MTA hut near the powerhouse was unable to be accessed during this study, as it was the locked off as property of MTA.

RCCG Caribou East & West Comfort Stations B607 & B606:

The Riley Creek Campground Caribou consists of (2) comfort stations fed from a GVEA utility transformer entrance to a 120/240V, 125A, 1Ø with a 110ACMD. The CMD feeds a 25KVA, 240V/600V, 1Ø transformer. From this transformer, power is distributed to comfort stations B607 and B606. In each of these comfort stations, the incoming power feeds into a junction box and directly to a Square D Circuit Breaker Enclosure with a 20A 3-Pole breaker for Caribou West, and a 20A 2-Pole for Caribou East, designated, 'Building Disconnect’. The ‘Building Disconnect’ feeds a 7.5kVA, 600V:120/240V, 1Ø transformer, designated ‘BR Transformer’, to the building panel, ‘West’ or ‘East’, a 120/240V, 100A, 1Ø Square D panelboard with a 60A 2-Pole MCB.

1. Disconnect for transformer feeding panel ‘WEST’ is using one 20A 3-Pole breaker feeding a 1Ø transformer. Panel ‘WEST’ is located above 6’7” AFG to the highest breaker position.

Recommend replacing 20 3-Pole disconnect with a 20A 2-Pole disconnect, rated for use in the enclosure, and relocating panel ‘West’ to a height within 6’7” to the highest breaker position.

2. Splice box upstream of transformer feeding Panel 'East' has live bare conductors arcing to cover plate of enclosure and panel 'East' Is located above 6'7" AFG to the highest disconnect breaker. Recommend demolishing unused, hot, bare conductors back to source, or provide approved insulated wire caps to avoid similar issue in future and relocating panel 'East' to a height within 6’7” to the highest breaker position.

RCCG Bear East Comfort Station B541:

The Riley Creek Campground Bear Comfort Station consists of a 120/240V, 1Ø Square D panelboard with a 60A 2-Pole MCB, assumed to be fed from ‘Cogen Disconnect’, see below.

Assumptions were made due to the lack of evidence of any other power systems in the area. Based on site personnel knowledge of the power systems it is assumed to be operating at a nominal voltage of 120/240V, 1Ø. .

No deficiencies we noted with this system.

Riley Creek Campground Laundry/Shower B531 Concessions:

The Riley Creek Campground Laundry/Shower building consists of GVEA service entrance to pad-mounted transformer denoted ‘Mercantile Transformer’. We assumed the ‘Mercantile Transformer’ to be a 75kVA, 12470V:120/240V, 1Ø transformer due to lack of information shown on transformer.

‘Mercantile Transformer’ feeds a 120/240, 100A, 1Ø Square D General Duty Safety Switch denoted, ‘Cogen Disconnect’, and (2) surface-mounted CMD on the exterior of building B386, see below, denoted ‘Meter B531’ and ‘Meter B386’, see below. Meter ‘B531 has a 100A 2-Pole MCB feeding Panel ‘B’, a 120/240V, 100A, 1Ø panelboard with a 100A 2-Pole MCB. Panel ‘B’ feeds a 30A Cutler- Hammer heavy duty safety switch located in the mechanical room that was unable to be opened without cutting power.

There are no issues we noted with the distribution system.

Riley Creek Mercantile B386 Concessions:

The Riley Creek Mercantile B386 Concessions building consists of a combination meter/disconnect, ‘Meter B386’, see above, which has a 200A 2-Pole MCB feeding panels designated ‘A1’ and ‘A2’, both are 120/240V, 225A, 1Ø panelboards with main lugs. Panel ‘A2’ then feeds panel ‘C’, located near the RV dump station, a 100A, 120/240, 1Ø panelboard with main lugs. Panel ‘A2’ feeds (3) 30A Cutler-Hammer heavy duty safety switches located in the mechanical room and backroom that were unable to be opened without cutting power to the heater, boiler, and walk-in freezer.

1. Panel ‘A2’ has no disconnecting means in panel. If feeder conductors are fully rated for the 200A 2-Pole overcurrent protection device on ‘Meter B386’ then installation is compliant. If not, then we recommend demolishing feed to ‘A2’ and providing new feeder conductors that are fully rated for the overcurrent protection device on ‘Meter B386’ (3#3/0 Cu, 1#4 Cu ground).

Rock Creek Reservoir Building B350:

The Rock Creek Reservoir building consists of an NPS transformer, assumed to be a 75kVA, 120/208V, 3Ø, due to size of equipment being fed and lack of identifiable markings on the transformer. The NPS transformer feeds a pad mounted 120/208V, 600A, 3Ø General Electric 8000 Line Control Center with a 200A 3-Pole main disconnect, denoted ‘B350 MDP’. ‘B350 MDP’ feeds Panel ‘W’ located in a sub compartment of the switchboard protected by a 100A 3-Pole MCB.

1. Conductors feeding Panel ‘W’ are rated for 70A and are undersized for a 100A breaker.

Recommend replacing feeders to Panel ‘W’ with (3) #2Cu.

C Camp Cabins S532, 533, 548-556, 571-574, 584, 585, 588-600, 663-665, 674, and 675:

The C Camp Cabins consist of 5 typical power distribution systems. Group 1 consists of Buildings S674, S675, S590, S589, S588, S591. Group 2 consists of buildings S572, S571, S533, S599, S594, S596, S597, S598, S592, S553, S554, S664. Group 3 consists of buildings S574 and S585. Group 4 consists of S550, S551 and S556. Group 5 consists of S595, S593, S592.

Buildings S532, S600, S552, S555, S549, S548 have no deficiencies that were noted. Assume power distribution system consists of a 12470V:120,1Ø pad mounted transformers located near the cabins which are fed from the powerhouse, see B548. Pad mounted transformers feed a 120/240V,1Ø Square D type M01 surface-mounted CMD with a 100A 2-Pole disconnect. CMD feeds an interior cabin panel, ‘A’, a 120/240V, 100-125A, 1Ø Square D panelboard with a 100-125A 2-Pole MCB or main lugs.

Group 1’s power distribution system consists of a 12470V:120,1Ø pad mounted transformers located near the cabins which are fed from the power house, see B548. Pad mounted transformers feed a 120/240V,1Ø Square D type M01 surface-mounted CMD with a 100A 2-Pole disconnect. CMD feeds an interior cabin Panel ‘A’, a 120/240V, 125A, 1Ø Square D panelboard with a 125A 2-Pole MCB.

Group 2’s power distribution system consists of a 12470V:120,1Ø pad mounted transformer located near the cabins which are fed from the power house, see B548. Pad mounted transformers feed a 120/240V,1Ø Square D type M01 surface-mounted CMD with a 100A 2-Pole disconnect. CMD feeds cabin Panel ’A’ 120/240V, 125A, 1Ø Square D panelboard with main lugs.

Group 3’s power distribution system consists of a 12470V:120,1Ø pad mounted transformer located near the cabins which are fed from the power house, see B548. Pad mounted transformers feed a 120/240V, 1Ø Square D type M01 surface-mounted CMD with a 100A 2-Pole disconnect. CMD feeds cabin Panel, ‘A’, a 120/240V, 125A, 1Ø Square D panelboard with a 100A 2-Pole MCB.

Group 4’s power distribution system consists of a 12470V:120,1Ø pad mounted transformer located near the cabins which are fed from the power house, see B548. Pad mounted transformers feed a 120/240V,1Ø Square D type M01 surface-mounted CMD with a 125A 2-Pole disconnect. CMD feeds cabin Panel ’A’a 120/240V, 125A, 1Ø Square D panelboard with a 125A 2-Pole MCB.

Group 5’s power distribution system consists of a 12470V:120,1Ø pad mounted transformer located near the cabins which are fed from the power house, see B548. Pad mounted transformers feed 120/240V,1Ø Square D type M01 surface-mounted CMD with a 125A 2-Pole disconnect. CMD feeds cabin Panel, ‘A’, a 120/240V, 125A, 1Ø Square D panelboard with main lugs.

The following building is an exception to these categories:

S663’s power distribution system consists of a 12470V:120,1Ø pad mounted transformer located near the cabins which are fed from the power house, see B548. Pad mounted transformers feed 120/240V,1Ø Square D type M01 surface-mounted CMD with no disconnect. CMD feeds cabin Panel, ‘A’, a 120/240V, 125A, 1Ø Square D panelboard with main lugs.

1. Panel CMD on exterior of S589 is mounted +7’ AFG to the highest breaker position.

Recommend relocating panel so highest breaker position is less than 6’7” AFF.

2. Building S663 has no disconnecting means on cabin. Recommend intercepting incoming feed and installing 100A 2-Pole disconnect rated for use in the CMD.

3. Building S594 Panel ‘A’ located inside the cabin is fed with #4 AWG Cu off a 100A 2-Pole disconnect in the CMD. #4 AWG wire is rated for 70A. Recommend providing (3) #2 AWG Cu wires and conduit as required to refeed panel.

4. Building S664 CMD was not able to be opened during the site visit as it was covered in snow.

C Camp Shower House B163:

The C Camp log Cabin consists of 12470V:120/240V,1Ø pad mounted transformers located near the C Camp cabins which are fed from the power house, see B548. The transformer feeds a 120/240V, 1Ø GE CTL Meter Socket Load Center with a 200A 2-Pole breaker. The CMD feeds a panel designated ‘A’, assumed to be a 120/240V, 125A 1Ø Square D type QO load center with main lugs through a 200A, 2-Pole fused disconnect with fuses of indiscernible size due to their installation in the disconnect. Based on the size of the upstream breaker and the enclosure rating, these fuses were assumed to be 200A.

5. Panel ‘A’ is mounted +7’ AFF to the highest breaker position. Recommend relocating panel so highest breaker position is less than 6’7” AFF.

C Camp Log Cabin S203:

The C Camp log Cabin consists of 12470V:120/240V,1Ø pad mounted transformers located near the C Camp cabins which are fed from the power house see B548. The transformer feeds a 120/240V, 100A, 1Ø Square D QO type M01 CMD with a 100A 2-Pole breaker. The CMD feeds Panel ‘A’ a 120/240V, 125A 1Ø Square D type QO load center.

There were no issues we noticed with the distribution system.

C Camp Recreation Hall B121:

The C Camp Recreation Hall consists of 12470V:120/240V,1Ø pad mounted transformers located near the C Camp cabins which are fed from the power house see B548. The transformer feeds a 120/240V, 1Ø Square D combo meter/disconnect (CMD) with a 100A 2-Pole MCB. The CMD feeds Panel ‘A’, a 120/240V, 225A 1Ø Square D type QO load center with a 200A 2-Pole MCB.

6. Panel ‘A’ MCB is 200A 2-Pole fed by a 100A 2-Pole disconnect. While this acceptable per code, recommended replacing 200A 2-Pole MCB on panel ‘A’ with a 100A 2-Pole MCB.

Maintenance Auto Shop B164:

The Maintenance Auto Shop consists of a 12470V:120/208V, 3Ø pad mounted transformer, assumed to be 300kVA based off site personnel information and lack of labels on transformer.

Transformer is fed from an underground line which goes to the overhead distribution above the pole mounted transformer by C-Camp. The transformer feeds the following (4) surface-mounted circuit breaker enclosures (CBE). CBE ‘F & H’ is a 120/208V, 225A, 3Ø, Square D type Q2 CBE, with a 200A 3-pole disconnect. CBE ‘G’ is a 120/208V 225A, 3Ø, Square D type Q2 CBE with a 200A 3-pole disconnect. CBE ‘A, B & E’ is a 120/208V 225A, 3Ø Square D type Q2 CBE with a 200A 3-pole disconnect. CBE panel ‘C & D’ is a 120/208V 225A, 3Ø Square D type Q2 CBE with a 200A 3-pole disconnect. CBE ‘F & H’ feeds panel ‘F’ a 120/208V 200A, 3Ø GE type NLTQ panelboard, with a 200 A 3-pole MCB. Panel ‘F’ feeds panel ‘H’ a 120/208V 100A, 3Ø Square D type NQOD panelboard, which in turn feeds a heat trace control panel with a 2-Pole 20A breaker. CBE ‘G’ feeds panel ‘G-1’ a 120/208V 22A, 3Ø Square D type NQOD panelboard. Panel ‘G-1’ feeds panel ‘G-2’ a 120/208V 225A Square D type NQOD panelboard. CBE ‘A, B &E’ feeds to a splice cabinet where the feed is tapped off of to feed to Panel ‘A’ and an unlabeled CBE with a 150A 2-Pole circuit breaker. Panel ‘A’ is a 120/208V 200A 3Ø, Square D type QO load center with a 200A 3-pole MCB. Panel ‘A’ feeds

Panel ‘B’ a 120/208V 200A 3Ø, Square D…