Attachment_8_Miscellaneous_Electrical_Requirements_and_Notes.pdf

B343 Structural Repairs B343

Miscellaneous Electrical Requirements and Notes;

Introduction:

This electrical standard has been prepared to promote consistency in design and construction, and to establish preferred wiring methods and materials used in electrical installations. The intent is to not reproduce the content of the various codes and standards that apply to Navy electrical installations. However, areas that have been identified as recurring issues in the design and construction of electrical systems have been included to avoid further confusion, and to eliminate the appearance of arbitrary decisions that can compound frustration to both the Navy and contractors in the execution of various contracts.

This document is not intended to contradict the requirements of the various UFCs, industry standards and codes governing the installation of efficient, cost effective, and safe electrical installations. With few exceptions, all the requirements indicated herein are in compliance with those various codes and standards. The electrical systems on the Portsmouth Naval Shipyard and AOR sites have evolved over many decades and under the supervision of many fine engineers, technicians and electricians from the past. To the greatest extent possible, this document attempts to respect the design rationale which resulted in the present state of the electrical distribution equipment on the shipyard.

This is a living document which will be subject to periodic revisions.

Changes are not meant to constrain, confuse, or trap contractors and engineers who perform the vital work on the shipyard electrical systems.

This document is meant to level the playing field for all stake holders as well as respond to situations and changing conditions in the electrical industry. As with other such documents, engineers and contractors will not be held responsible for retroactive corrections due to new requirements and revisions to this standard as long as contract requirements are met for prior work.

Electrical

I. DESIGN

a. Comply with

i. UFC 1-200-01 General Building Requirements

ii. UFC 3-501-01 Electrical Engineering

iii. UFC 3-520-01 Interior Electrical Systems

iv. UFC 3-530-01 Design: Interior and Exterior Lighting and

Controls

v. NFPA 70, NEC

vi. NESC, National Electrical Safety Code, ANSI Standard C2, by IEEE. Note: NESC will generally not apply to “small projects” covered by this standard. However, Designer should be aware of it and consider NESC in Design.

b. Although intended to be simplified specifications for “small projects”, these standards are not universal. In addition to Engineering the system components , layout and determination of sizing, etc. based on loads, distances, etc., the Designer must consider such aspects as listed below, edit and add text to this standard as appropriate, and show on drawings :

i. A Requirement for PVC Coated RMC, conduit bodies, straps, etc. and stainless steel for generally all exterior work at PNSY and other marine location vs. the use of standard galvanized for non-marine (inland) locations.

ii. Condition of Use of EMT vs. RMC. The decision to use EMT within a particular building should be based on the use of the building, i.e. industrial/ commercial, e.g. in Bldg 300 office areas EMT is appropriate, whereas in the high bay areas RMC is in order. Existing materials is perhaps the best guide to stick with it for consistency, or to make an upgrade/change.

iii. Hazardous or other special locations that require anything other than NEMA 1 or 4X enclosures.

iv. Lighting Fixtures

v. Requirements for expansion joints in long runs or where crossing structural joints.

vi. Specialties such as crane conductor bar systems, cords and cord caps, etc.

II. CONSTRUCTION

1. General

a. Comply with current edition of NFPA 70, NEC

b. Comply with current edition of NFPA 70E, Standard for Electrical

Safety Requirements for Employee Workplaces

c. Comply with NECA 1-2006, Standard for Good Workmanship in

Electrical Construction

d. Provide submittals for all electrical materials

e. Provide as-built drawings showing any changes from design/contract drawings.

f. Materials and Fasteners

i. Devices containing mercury shall not be used.

ii. UL Listing for the intended purpose is required for any material categories where UL listings are available.

iii. Corrosion resistant –

1. Stainless steel for all exterior locations where NEMA 4X, stainless steel or PVC coated items are required

iv. Zinc die-cast, Zamac, and similar “pot metal” materials and components are not allowed.

v. Fasteners shall be removable – Nails and other similar “drive in” type fasteners that cannot be unscrewed are not allowed

g. Abbreviations:

i. AFF Above Finished Floor

ii. Ckt Circuit

iii. KAIC Kilo Amperes Interrupting Capacity

iv. NEC National Electrical Code

v. NECA National Electrical Contractors Association

vi. NEMA National Electrical Manufacturer’s Association

vii. PP Power Panel

viii. PVC Polyvinyl Chloride

ix. RMC Rigid Metal Conduit, Galvanized

x. Sch Schedule

xi. STR Stranded

xii. UNO Unless noted Otherwise

h. Multi-wire branch circuits shall be avoided.

2. Conductors

a. Copper only

b. Insulation shall be THHN/THWN. Type TW is acceptable for grounds.

c. Minimum #12 AWG, Except Control Wiring is minimum #14 AWG

d. #12 AWG & Larger - Stranded

e. #14 and smaller – Solid

i. Exception: Stranded wire as allowed in UFGS 26 20 00

f. Twist on connectors (wire nuts) shall be suitable for both stranded and solid wire terminations. Coordinate with manufacturer’s tables and recommendations.

g. Standards & Specifications:

i. UFC 3-520-01

ii. UFGS 26 20 00

h. Color code

i. > 240 V: A Brown B Orange C Yellow

ii. 240 V & below: A Black B Red C Blue

iii. Neutral: White

iv. Ground: Green or bare copper

3. Wiring Devices:

a. Wiring devices shall be “Spec” or “Commercial” grade as a minimum.

b. General purpose toggle switches shall be 120/277 volt rated.

c. Ground fault receptacles shall be side wired or screw clamp back wired type. Provide receptacles with through wire protection via the ground fault circuit.

d. Cage clamp terminations on wiring devices are prohibited.

e. Wiring devices shall be screw clamp back wire type when terminating with stranded wire. Side wire termination of stranded wire is prohibited.

i. Exception: side wiring of stranded wire is acceptable if terminated with crimp-on connectors.

f. Standards & Specifications:

i. UFC 3-520-01

ii. UFGS 26 20 00

4. Conduit & Raceway

a. Minimum ¾ “ trade size

b. RMC – Shall be used

i. In all exterior locations

ii. Where exposed to impact/damage from traffic, stored materials, or work processes, and all areas that are subject to crane load traffic.

c. PVC Coated RMC, as well as PVC coated fittings, conduit bodies, Junction boxes, etc. is required in all exterior locations along/under bridges, piers/berths, dry docks, and similar marine areas that are subject to salt water immersion or wetting by wind action or spray.

d. Liquid tight flexible conduit –

i. Provide where required to achieve a flexible, vibration isolating connection.

ii. Use Steel Core, UL listed Type only

iii. Length of flexible conduit shall be minimized, to only the amount required for flexibility, generally less than two feet

5. Panel Boards:

a. Adding new circuits to existing panel boards that have been in service in excess of 30 years shall be coordinated with the PWD ME Electrical Engineering Branch.

i. Under no circumstances will new work be allowed on Federal Pacific panel boards and switchboards without prior coordination with and authorization from the PWD ME Electrical Engineering Branch.

b. Series rated circuit breakers are prohibited.

i. In high fault current installations it may be impractical to select circuit breakers with equivalent or greater withstand ratings. In such cases, installation of a properly sized current limiting fuse ahead of the downstream breaker may be considered. Coordinate with PWD ME Electrical Engineering Branch.

c. Standards & Specifications:

i. UFC 3-520-01

ii. UFGS 26 20 00

6. Lighting

a. Exterior Lighting

i. Standards & Specifications:

1. UFC 3-530-01

2. UFGS 26 56 00

7. Connectors, Couplings, etc.

a. Pvc coated Steel, galvanized or plated

b. Connectors to be insulated throat,

c. Bushings shall be steel, with insulating insert

d. Conduit hubs shall be used for all exterior work when attaching to non – threaded devices e.g. Junction boxes, panelboards

8. Enclosures

a. Exterior Locations shall be NEMA 4X, stainless steel or Pvc coated cast malleable iron, galvanized.

9. Boxes

a. Steel galvanized, except in damp/wet locations.

b. Damp/wet locations require cast, malleable iron or stainless steel, with gasketed covers

c. Minimum 4 11/16” square

d. Plates

i. For interior surface mounted work and all exterior locations – SS or Galvanized

ii. Weather proof receptacle covers shall be “weather proof in use”

10. Conduit Bodies – Pvc coated Cast malleable iron or stainless steel, with gasketed covers

11. Circuit Breakers

a. When adding to an existing panel, match the same brand within the panel.

b. Provide circuit breaker KAIC equal to or in excess of the rating of the panel and/or the existing breakers.

12. Clamps & Straps and Mounting

a. Use malleable iron straps on GRC.

b. Use clamp back spacers with each strap in exterior and damp wet locations.

c. Attach straps with screws, bolts or other threaded fasteners, do not use “snap on” conduit supports.

d. Fasten only directly to structure, not to other conduit, pipe, ductwork, etc.

e. Where backboards are required use SS or galvanized steel support frame. Plywood or other wooden materials shall not be used to support electrical equipment in any wet, damp or exterior location.

13. Identification and Markings

a. When adding to an existing panel the entire circuit directory shall be reprinted and reinstalled under a protective clear plastic sheet.

b. Interior Junction Boxes

i. Mark circuit and voltage on cover in 1” high block lettering with indelible marker.

ii. Identifier/name, Voltage, source and destination where applicable

iii. e.g. JB 1, 240 V, Ckt 17 from PP-6 to EF-3

c. Toggle switches & Convenience receptacles.

i. Printed tape, black lettering on clear or background color to match plate

ii. Include source and circuit

iii. e.g. PP-6, Ckt 13

d. Panels, Safety Switches, and similar enclosures

i. Engraved laminated plastic label

ii. Minimum ¼ “ white lettering on black background

iii. Fastened with screws, adhesive alone is not sufficient.

iv. Include Identifier/name, Voltage, and source

v. e.g. PP-6, 240V, 4W 3 Phase, Fed from T-2 in Room 112

vi. Provide NFPA 70E Warning labels if enclosure is not already labeled.

14. Contractor Requirements

Considerations:

a. Operation of circuit breakers, switches and other energy regulating components of the utility systems on the shipyard shall be coordinated through the Back Shift Rep via a formal outage request. Under normal circumstances, all switching shall be the responsibility of the PWD ME utility operators.

i. Operation of electrical devices under the contractor’s control may be operated by qualified contractor personnel.

The contractor shall establish the line of demarcation between contractor control and PWD ME utility control prior to the start of each project.

b. Standards and Specifications:

i. USACE EM 385-1-1

15. SAFETY

a. Contractor shall be responsible for maintaining a work site compliant with EM 385-1-1 Safety and Health Requirements Manual (2008 Edition) and all other OSHA regulations associated with the completion of the work.

b. Contractor shall ensure all work completed meets the requirements specified in EM 385-1-1 (2008 Edition).

c. The contractor shall prepare a project specific Accident Prevention Plan (APP) and Activity Hazard Analysis (AHA) for this work.

End