260533 Raceway and Boxes seismic.pdf

UPGRADE EMERGENCY POWER IN BUILDING 138

VAMC, MARION, IN PROJECT: 610-16-104

01-01-18

26 05 33 - 1

SECTION 26 05 33

RACEWAY AND BOXES FOR ELECTRICAL SYSTEMS

PART 1 - GENERAL

1.1 DESCRIPTION

A. This section specifies the furnishing, installat ion, and connection of conduit, fittings, and boxes, to form complete, coo rdinated, grounded raceway systems. Raceways are required for all wiri ng unless shown or specified otherwise.

B. Definitions: The term conduit, as used in this s pecification, shall mean any or all of the raceway types specified.

1.2 RELATED WORK

A. Section 06 10 00, ROUGH CARPENTRY: Mounting boar d for telephone closets.

B. Section 07 84 00, FIRESTOPPING: Sealing around p enetrations to maintain the integrity of fire rated construction.

C. Section 07 92 00, JOINT SEALANTS: Sealing around conduit penetrations through the building envelope to prevent moisture m igration into the building.

D. Section 09 91 00, PAINTING: Identification and p ainting of conduit and other devices.

E. Section 13 05 41, SEISMIC RESTRAINT REQUIREMENTS FOR NON-STRUCTURAL

COMPONENTS: Conduits bracing.

F. Section 26 05 11, REQUIREMENTS FOR ELECTRICAL IN STALLATIONS: General electrical requirements and items that are common t o more than one section of Division 26.

G. Section 26 05 26, GROUNDING AND BONDING FOR ELEC TRICAL SYSTEMS:

Requirements for personnel safety and to provide a low impedance path for possible ground fault currents.

H. Section 26 05 41, UNDERGROUND ELECTRICAL CONSTRU CTION: Underground conduits.

I. Section 31 20 00, EARTHWORK: Bedding of conduits .

1.3 QUALITY ASSURANCE

A. Quality Assurance shall be in accordance with Pa ragraph, QUALIFICATIONS

(PRODUCTS AND SERVICES) in Section 26 05 11, REQUIR EMENTS FOR

ELECTRICAL INSTALLATIONS.

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1.4 SUBMITTALS

A. Submit in accordance with Paragraph, SUBMITTALS in Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS, and the following requirements:

1. Shop Drawings:

a. Size and location of main feeders.

b. Size and location of panels and pull-boxes.

c. Layout of required conduit penetrations through structural elements.

d. Submit the following data for approval:

1) Raceway types and sizes.

2) Conduit bodies, connectors and fittings.

3) Junction and pull boxes, types and sizes.

2. Certifications: Two weeks prior to final inspec tion, submit the following:

a. Certification by the manufacturer that raceways, conduits, conduit bodies, connectors, fittings, junction and pull boxes, and all related equipment conform to the requiremen ts of the drawings and specifications.

b. Certification by the Contractor that raceways, c onduits, conduit bodies, connectors, fittings, junction and pull box es, and all related equipment have been properly installed.

1.5 APPLICABLE PUBLICATIONS

A. Publications listed below (including amendments, addenda, revisions, supplements, and errata) form a part of this specif ication to the extent referenced. Publications are referenced in t he text by designation only.

B. American Iron and Steel Institute (AISI):

S100-12.................North American Specificatio n for the Design of

Cold-Formed Steel Structural Members

C. National Electrical Manufacturers Association (N EMA):

C80.1-15................Electrical Rigid Steel Cond uit

C80.3-15................Steel Electrical Metal Tubi ng

C80.6-05................Electrical Intermediate Met al Conduit

FB1-14..................Fittings, Cast Metal Boxes and Conduit Bodies for Conduit, Electrical Metallic Tubing and

Cable

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FB2.10-13...............Selection and Installation Guidelines for

Fittings for use with Non-Flexible Conduit or

Tubing (Rigid Metal Conduit, Intermediate

Metallic Conduit, and Electrical Metallic

Tubing)

FB2.20-14...............Selection and Installation Guidelines for

Fittings for use with Flexible Electrical

Conduit and Cable

TC-2-13.................Electrical Polyvinyl Chlori de (PVC) Tubing and

Conduit

TC-3-13.................PVC Fittings for Use with R igid PVC Conduit and

Tubing

D. National Fire Protection Association (NFPA):

70-20...................National Electrical Code (N EC)

E. Underwriters Laboratories, Inc. (UL):

1-05....................Flexible Metal Conduit

5-16....................Surface Metal Raceway and F ittings

6-07....................Electrical Rigid Metal Cond uit - Steel

50-15...................Enclosures for Electrical E quipment

360-13..................Liquid-Tight Flexible Steel Conduit

467-13..................Grounding and Bonding Equip ment

514A-13.................Metallic Outlet Boxes

514B-12.................Conduit, Tubing, and Cable Fittings

514C-14.................Nonmetallic Outlet Boxes, F lush-Device Boxes and Covers

651-11..................Schedule 40 and 80 Rigid PV C Conduit and

Fittings

651A-11.................Type EB and A Rigid PVC Con duit and HDPE

Conduit

797-07..................Electrical Metallic Tubing

1242-14.................Electrical Intermediate Met al Conduit - Steel

PART 2 - PRODUCTS

2.1 MATERIAL

A. Conduit Size: In accordance with the NEC, but n ot less than (0.75-inch) unless otherwise shown. Where permitted by t he NEC, 13 mm (0.5-inch) flexible conduit may be used for tap connecti ons to recessed lighting fixtures.

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B. Conduit:

1. Size: In accordance with the NEC, but not less than (0.75-inch).

2. Rigid Steel Conduit (RMC): Shall conform to UL 6 and NEMA C80.1.

3. Rigid Intermediate Steel Conduit (IMC): Shall c onform to UL 1242 and NEMA C80.6.

4. Electrical Metallic Tubing (EMT): Shall conform to UL 797 and NEMA

C80.3. Maximum size shall not exceed 105 mm (4 inch es) and shall be permitted only with cable rated 600 V or less.

5. Flexible Metal Conduit: Shall conform to UL 1.

6. Liquid-tight Flexible Metal Conduit: Shall conf orm to UL 360.

7. Direct Burial Plastic Conduit: Shall conform to UL 651 and UL 651A, heavy wall PVC or high density polyethylene (PE).

8. Surface Metal Raceway: Shall conform to UL 5.

C. Conduit Fittings:

1. Rigid Steel and Intermediate Metallic Conduit Fi ttings:

a. Fittings shall meet the requirements of UL 514B and NEMA FB1.

b. Standard threaded couplings, locknuts, bushings, conduit bodies, and elbows: Only steel or malleable iron materials are acceptable. Integral retractable type IMC couplings are also acceptable.

c. Locknuts: Bonding type with sharp edges for dig ging into the metal wall of an enclosure.

d. Bushings: Metallic insulating type, consisting of an insulating insert, molded or locked into the metallic body of the fitting.

Bushings made entirely of metal or nonmetallic mate rial are not permitted.

e. Erickson (Union-Type) and Set Screw Type Couplin gs: Approved for use in concrete are permitted for use to complete a conduit run where conduit is installed in concrete. Use set scr ews of case-hardened steel with hex head and cup point to firml y seat in conduit wall for positive ground. Tightening of set screws with pliers is prohibited.

f. Sealing Fittings: Threaded cast iron type. Use continuous drain-type sealing fittings to prevent passage of water v apor. In concealed work, install fittings in flush steel box es with blank cover plates having the same finishes as that of ot her electrical plates in the room.

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2. Electrical Metallic Tubing Fittings:

a. Fittings and conduit bodies shall meet the requi rements of UL

514B, NEMA C80.3, and NEMA FB1.

b. Only steel or malleable iron materials are accep table.

c. Setscrew Couplings and Connectors: Use setscrew s of case-hardened steel with hex head and cup point, to firm ly seat in wall of conduit for positive grounding.

d. Indent-type connectors or couplings are prohibit ed.

e. Die-cast or pressure-cast zinc-alloy fittings or fittings made of

"pot metal" are prohibited.

3. Flexible Metal Conduit Fittings:

a. Conform to UL 514B. Only steel or malleable iro n materials are acceptable.

b. Clamp-type, with insulated throat.

4. Liquid-tight Flexible Metal Conduit Fittings:

a. Fittings shall meet the requirements of UL 514B and NEMA FB1.

b. Only steel or malleable iron materials are accep table.

c. Fittings must incorporate a threaded grounding c one, a steel or plastic compression ring, and a gland for tightenin g. Connectors shall have insulated throats.

5. Direct Burial Plastic Conduit Fittings: Fitting s shall meet the requirements of UL 514C and NEMA TC3.

6. Surface Metal Raceway Fittings: As recommended by the raceway manufacturer. Include couplings, offsets, elbows, expansion joints, adapters, hold-down straps, end caps, conduit entry fittings, accessories, and other fittings as required for com plete system.

7. Expansion and Deflection Couplings:

a. Conform to UL 467 and UL 514B.

b. Accommodate a 19 mm (0.75-inch) deflection, expa nsion, or contraction in any direction, and allow 30 degree a ngular deflections.

c. Include internal flexible metal braid, sized to guarantee conduit ground continuity and a low-impedance path for faul t currents, in accordance with UL 467 and the NEC tables for equip ment grounding conductors.

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d. Jacket: Flexible, corrosion-resistant, watertig ht, moisture and heat-resistant molded rubber material with stainles s steel jacket clamps.

D. Conduit Supports:

1. Parts and Hardware: Zinc-coat or provide equiva lent corrosion protection.

2. Individual Conduit Hangers: Designed for the pu rpose, having a pre-assembled closure bolt and nut, and provisions for receiving a hanger rod.

3. Multiple Conduit (Trapeze) Hangers: Not less th an 38 mm x 38 mm

(1.5 x 1.5 inches), 12-gauge steel, cold-formed, li pped channels;

with not less than 9 mm (0.375-inch) diameter steel hanger rods.

4. Solid Masonry and Concrete Anchors: Self-drilli ng expansion shields, or machine bolt expansion.

E. Outlet, Junction, and Pull Boxes:

1. Comply with UL-50 and UL-514A.

2. Rustproof cast metal where required by the NEC o r shown on drawings.

3. Sheet Metal Boxes: Galvanized steel, except whe re shown on drawings.

F. Metal Wireways: Equip with hinged covers, excep t as shown on drawings.

Include couplings, offsets, elbows, expansion joint s, adapters, hold-down straps, end caps, and other fittings to match and mate with wireways as required for a complete system.

PART 3 - EXECUTION

3.1 PENETRATIONS

A. Cutting or Holes:

1. Cut holes in advance where they should be placed in the structural elements, such as ribs or beams. Obtain the approv al of the COR prior to drilling through structural elements.

2. Cut holes through concrete and masonry in new an d existing structures with a diamond core drill or concrete sa w. Pneumatic hammers, impact electric, hand, or manual hammer-ty pe drills are not allowed, except when permitted by the COR where wor king space is limited.

B. Firestop: Where conduits, wireways, and other e lectrical raceways pass through fire partitions, fire walls, smoke partitio ns, or floors, install a fire stop that provides an effective barr ier against the

26 05 33 - 7 spread of fire, smoke and gases as specified in Sec tion 07 84 00, FIRESTOPPING.

C. Waterproofing: At floor, exterior wall, and roo f conduit penetrations, completely seal the gap around conduit to render it watertight, as specified in Section 07 92 00, JOINT SEALANTS.

3.2 INSTALLATION, GENERAL

A. In accordance with NEC, NEMA, UL, as shown on dr awings, and as specified herein.

B. Raceway systems used for Essential Electrical Sy stems (EES) shall be entirely independent of other raceway systems.

C. Install conduit as follows:

1. In complete mechanically and electrically contin uous runs before pulling in cables or wires.

2. Unless otherwise indicated on the drawings or sp ecified herein, installation of all conduits shall be concealed wit hin finished walls, floors, and ceilings.

3. Flattened, dented, or deformed conduit is not pe rmitted. Remove and replace the damaged conduits with new conduits.

4. Assure conduit installation does not encroach in to the ceiling height head room, walkways, or doorways.

5. Cut conduits square, ream, remove burrs, and dra w up tight.

6. Independently support conduit at 2.4 M (8 feet) on centers with specified materials and as shown on drawings.

7. Do not use suspended ceilings, suspended ceiling supporting members, lighting fixtures, other conduits, cable tray, boxe s, piping, or ducts to support conduits and conduit runs.

8. Support within 300 mm (12 inches) of changes of direction, and within 300 mm (12 inches) of each enclosure to whic h connected.

9. Close ends of empty conduits with plugs or caps at the rough-in stage until wires are pulled in, to prevent entry o f debris.

10. Conduit installations under fume and vent hoods are prohibited.

11. Secure conduits to cabinets, junction boxes, pu ll-boxes, and outlet boxes with bonding type locknuts. For rigid steel and IMC conduit installations, provide a locknut on the inside of t he enclosure, made up wrench tight. Do not make conduit connecti ons to junction box covers.

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12. Flashing of penetrations of the roof membrane i s specified in

Section 07 60 00, FLASHING AND SHEET METAL.

13. Conduit bodies shall only be used for changes i n direction, and shall not contain splices.

D. Conduit Bends:

1. Make bends with standard conduit bending machine s.

2. Conduit hickey may be used for slight offsets an d for straightening stubbed out conduits.

3. Bending of conduits with a pipe tee or vise is p rohibited.

E. Layout and Homeruns:

1. Install conduit with wiring, including homeruns, as shown on drawings.

2. Deviations: Make only where necessary to avoid interferences and only after drawings showing the proposed deviations have been submitted and approved by the COR.

F. Conduit shall be run concealed in all finished a reas of new construction and elsewhere unless specifically indi cated or upon specific permission by the COR. All conduit shall p arallel building lines.

G. Conduit shall be run overhead and shall not be r un below concrete slabs unless specifically indicated on the drawings and i n the legend on the drawings.

H. Contractor shall record carefully on a set of "a s built" prints the exact location of all feeder conduits.

I. Unless noted otherwise on the drawings, a maximu m of 8 conductors shall be installed in a branch circuit conduit. This max imum is a count of all phase and neutral conductors only - ground cond uctors are not counted when determining maximum fill for this purp ose.

3.3 CONCEALED WORK INSTALLATION

A. In Concrete:

1. Conduit: Rigid steel, IMC, or EMT. Do not inst all EMT in concrete slabs that are in contact with soil, gravel, or vap or barriers.

2. Align and run conduit in direct lines.

3. Install conduit through concrete beams only:

a. Where shown on the structural drawings.

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b. As approved by the COR prior to construction, an d after submittal of drawing showing location, size, and position of each penetration.

4. Installation of conduit in concrete that is less than 75 mm (3 inches) thick is prohibited.

a. Conduit outside diameter larger than one-third o f the slab thickness is prohibited.

b. Space between conduits in slabs: Approximately six conduit diameters apart, and one conduit diameter at condui t crossings.

c. Install conduits approximately in the center of the slab so that there will be a minimum of 19 mm (0.75-inch) of con crete around the conduits.

5. Make couplings and connections watertight. Use thread compounds that are UL approved conductive type to ensure low resistance ground continuity through the conduits. Tightening setscre ws with pliers is prohibited.

B. Above Furred or Suspended Ceilings and in Walls:

1. Conduit for Conductors Above 600 V: Rigid steel . Mixing different types of conduits in the same system is prohibited.

2. Conduit for Conductors 600 V and Below: Rigid s teel, IMC, or EMT.

Mixing different types of conduits in the same syst em is prohibited.

3. Align and run conduit parallel or perpendicular to the building lines.

4. Connect recessed lighting fixtures to conduit ru ns with maximum 1.8

M (6 feet) of flexible metal conduit extending from a junction box to the fixture.

5. Tightening set screws with pliers is prohibited.

6. For conduits running through metal studs, limit field cut holes to no more than 70% of web depth. Spacing between hole s shall be at least 457 mm (18 inches). Cuts or notches in flange s or return lips shall not be permitted.

3.4 EXPOSED WORK INSTALLATION

A. Unless otherwise indicated on drawings, exposed conduit is only permitted in mechanical and electrical rooms.

B. Conduit for Conductors Above 600 V: Rigid steel . Mixing different types of conduits in the system is prohibited.

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C. Conduit for Conductors 600 V and Below: Rigid s teel, IMC, or EMT.

Mixing different types of conduits in the system is prohibited.

D. Align and run conduit parallel or perpendicular to the building lines.

E. Install horizontal runs close to the ceiling or beams and secure with conduit straps.

F. Support horizontal or vertical runs at not over 2.4 M (8 feet) intervals.

G. Surface Metal Raceways: Use only where shown on drawings.

H. Painting:

1. Paint exposed conduit as specified in Section 09 91 00, PAINTING.

2. Paint all conduits containing cables rated over 600 V safety orange.

Refer to Section 09 91 00, PAINTING for preparation , paint type, and exact color. In addition, paint legends, using 50 mm (2 inch) high black numerals and letters, showing the cable volta ge rating.

Provide legends where conduits pass through walls a nd floors and at maximum 6 M (20 feet) intervals in between.

3.5 DIRECT BURIAL INSTALLATION

Refer to Section 26 05 41, UNDERGROUND ELECTRICAL CONSTRUCTION.

3.6 HAZARDOUS LOCATIONS

A. Use rigid steel conduit only.

B. Install UL approved sealing fittings that preven t passage of explosive vapors in hazardous areas equipped with explosion-p roof lighting fixtures, switches, and receptacles, as required by the NEC.

3.7 WET OR DAMP LOCATIONS

A. Use rigid steel or IMC conduits unless as shown on drawings.

B. Provide sealing fittings to prevent passage of w ater vapor where conduits pass from warm to cold locations, i.e., re frigerated spaces, constant-temperature rooms, air-conditioned spaces, building exterior walls, roofs, or similar spaces.

C. Use rigid steel or IMC conduit within 1.5 M (5 f eet) of the exterior and below concrete building slabs in contact with s oil, gravel, or vapor barriers, unless as shown on drawings. Condu it shall be half-lapped with 10 mil PVC tape before installation. A fter installation, completely recoat or retape any damaged areas of co ating.

D. Conduits run on roof shall be supported with int egral galvanized lipped steel channel, attached to UV-inhibited polycarbona te or polypropylene blocks every 2.4 M (8 feet) with 9 mm (3/8-inch) ga lvanized threaded

26 05 33 - 11 rods, square washer and locknut. Conduits shall be attached to steel channel with conduit clamps.

3.8 MOTORS AND VIBRATING EQUIPMENT

A. Use flexible metal conduit for connections to mo tors and other electrical equipment subject to movement, vibration , misalignment, cramped quarters, or noise transmission.

B. Use liquid-tight flexible metal conduit for inst allation in exterior locations, moisture or humidity laden atmosphere, c orrosive atmosphere, water or spray wash-down operations, inside airstre am of HVAC units, and locations subject to seepage or dripping of oil , grease, or water.

C. Provide a green equipment grounding conductor wi th flexible and liquid-tight flexible metal conduit.

3.9 EXPANSION JOINTS

A. Conduits 75 mm (3 inch) and larger that are secu red to the building structure on opposite sides of a building expansion joint require expansion and deflection couplings. Install the cou plings in accordance with the manufacturer's recommendations.

B. Provide conduits smaller than 75 mm (3 inch) wit h junction boxes on both sides of the expansion joint. Connect flexible metal conduits to junction boxes with sufficient slack to produce a 1 25 mm (5 inch) vertical drop midway between the ends of the flexib le metal conduit.

Flexible metal conduit shall have a green insulated copper bonding jumper installed. In lieu of this flexible metal co nduit, expansion and deflection couplings as specified above are accepta ble.

C. Install expansion and deflection couplings where shown.

D. Seismic Areas: In seismic areas, provide condui ts rigidly secured to the building structure on opposite sides of a build ing expansion joint with junction boxes on both sides of the joint. Co nnect conduits to junction boxes with 375 mm (15 inches) of slack fle xible conduit.

Flexible conduit shall have a copper bonding jumper installed.

3.10 CONDUIT SUPPORTS

A. Safe working load shall not exceed one-quarter o f proof test load of fastening devices.

B. Use pipe straps or individual conduit hangers fo r supporting individual conduits.

C. Support multiple conduit runs with trapeze hange rs. Use trapeze hangers that are designed to support a load equal t o or greater than

26 05 33 - 12 the sum of the weights of the conduits, wires, hang er itself, and an additional 90 kg (200 lbs). Attach each conduit wit h U-bolts or other approved fasteners.

D. Support conduit independently of junction boxes, pull-boxes, fixtures, suspended ceiling T-bars, angle supports, and simil ar items.

E. Fasteners and Supports in Solid Masonry and Conc rete:

1. New Construction: Use steel or malleable iron c oncrete inserts set in place prior to placing the concrete.

2. Existing Construction:

a. Steel expansion anchors not less than 6 mm (0.25 -inch) bolt size and not less than 28 mm (1.125 inch) in embedment.

b. Power set fasteners not less than 6 mm (0.25-inc h) diameter with depth of penetration not less than 75 mm (3 inch).

c. Use vibration and shock-resistant anchors and fa steners for attaching to concrete ceilings.

F. Hollow Masonry: Toggle bolts.

G. Bolts supported only by plaster or gypsum wallbo ard are not acceptable.

H. Metal Structures: Use machine screw fasteners o r other devices specifically designed and approved for the applicat ion.

I. Attachment by wood plugs, rawl plug, plastic, le ad or soft metal anchors, or wood blocking and bolts supported only by plaster is prohibited.

J. Chain, wire, or perforated strap shall not be us ed to support or fasten conduit.

K. Spring steel type supports or fasteners are proh ibited for all uses except horizontal and vertical supports/fasteners w ithin walls.

L. Vertical Supports: Vertical conduit runs shall have riser clamps and supports in accordance with the NEC and as shown. Provide supports for cable and wire with fittings that include internal wedges and retaining collars.

3.11 BOX INSTALLATION

A. Boxes for Concealed Conduits:

1. Flush-mounted.

2. Provide raised covers for boxes to suit the wall or ceiling, construction, and finish.

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B. In addition to boxes shown, install additional b oxes where needed to prevent damage to cables and wires during pulling-i n operations or where more than the equivalent of 4-90 degree bends are necessary.

C. Locate pullboxes so that covers are accessible a nd easily removed.

Coordinate locations with piping and ductwork where installed above ceilings.

D. Remove only knockouts as required. Plug unused openings. Use threaded plugs for cast metal boxes and snap-in metal covers for sheet metal boxes.

E. Outlet boxes mounted back-to-back in the same wa ll are prohibited. A minimum 600 mm (24 inch) center-to-center lateral s pacing shall be maintained between boxes.

F. Flush-mounted wall or ceiling boxes shall be ins talled with raised covers so that the front face of raised cover is fl ush with the wall.

Surface-mounted wall or ceiling boxes shall be inst alled with surface-style flat or raised covers.

G. Minimum size of outlet boxes for ground fault ci rcuit interrupter

(GFCI) receptacles is 100 mm (4 inches) square x 55 mm (2.125 inches) deep, with device covers for the wall material and thickness involved.

H. Stencil or install phenolic nameplates on covers of the boxes identified on riser diagrams; for example "SIG-FA J B No. 1."

I. On all branch circuit junction box covers, ident ify the circuits with black marker.

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