26 27 26 Wiring for Low Voltage Devices.doc

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SECTION 26 27 26

WIRING DEVICES

PART 1 ‑ GENERAL

1.1 DESCRIPTION

This section specifies the furnishing, installation and connection of wiring devices.

1.2 RELATED WORK

A.

Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS: General electrical requirements that are common to more than one section of Division 26.

B. Section 26 05 21, LOW-VOLTAGE ELECTRICAL POWER CONDUCTORS AND CABLES (600 VOLTS AND BELOW): Cables and wiring.

C. Section 26 05 26, GROUNDING AND BONDING FOR ELECTRICAL SYSTEMS: Requirements for personnel safety and to provide a low impedance path to ground for possible ground fault currents.

1.3 SUBMITTALS

A.

In accordance with Section 26 05 11, REQUIREMENTS FOR ELECTRICAL INSTALLATIONS, submit the following:

B. Shop Drawings:

1.

Sufficient information, clearly presented, shall be included to determine compliance with drawings and specifications.

2.

Include electrical ratings, dimensions, mounting details, construction materials, grade and termination information.

C.

Manuals: Two weeks prior to final inspection, deliver four copies of the following to the Resident Engineer: Technical data sheets and information for ordering replacement units.

D.

Certifications: Two weeks prior to final inspection, submit four copies of the following to the Resident Engineer: Certification by the Contractor that the devices comply with the drawings and specifications, and have been properly installed, aligned, and tested.

1.4 APPLICABLE PUBLICATIONS

A.

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

B.

National Fire Protection Association (NFPA):

70-02 National Electrical Code (NEC)

C.

National Electrical Manufacturers Association (NEMA):

WD 1-99

General Color Requirements for Wiring Devices

WD 6-02

Wiring Devices – Dimensional Requirements

D.

Underwriter’s Laboratories, Inc. (UL):

5-96 Surface Metal Raceways and Fittings

20-00 General-Use Snap Switches

231-98 Power Outlets

467-93 Grounding and Bonding Equipment

498-01 Attachment Plugs and Receptacles

943-03 Ground-Fault Circuit-Interrupters

PART 2 ‑ PRODUCTS

2.1 RECEPTACLES

A.

General: All receptacles shall be listed by Underwriters Laboratories, Inc., as hospital grade (green dot identification) and conform to NEMA WD 1. (EXCEPTION ‑ Receptacle types which have no listing as hospital grade but are listed by UL in their respective categories or receptacles indicated on the drawings as “not hospital grade”).

1.

Mounting straps shall be plated steel, with break-off plaster ears and shall include a self-grounding feature. Terminal screws shall be brass, brass plated or a copper alloy metal.

2.

Receptacles shall have provisions for back wiring with separate metal clamp type terminals (four min.) and side wiring from four captively held binding screws.

B.

Duplex receptacles shall be single phase, 20 ampere, 120 volts, 2‑pole, 3‑wire, and conform to the NEMA 5‑20R configuration in NEMA WD 6. The duplex type shall have break‑off feature for two-circuit operation. The ungrounded pole of each receptacle shall be provided with a separate terminal.

1.

Bodies shall be ivory in color.

2.

Switched duplex receptacles shall be wired so that only the top receptacle is switched. The remaining receptacle shall be unswitched.

3.

Duplex Receptacles on Emergency Circuit:

a.

Bodies shall be red in color. Wall plates shall be red with the word "EMERGENCY" engraved in 6 mm, (1/4 inch) white letters.

4.

Ground Fault Interrupter Duplex Receptacles: Shall be an integral unit suitable for mounting in a standard outlet box.

a.

Ground fault interrupter shall be hospital grade and consist of a differential current transformer, solid state sensing circuitry and a circuit interrupter switch. It shall be rated for operation on a 60 Hz, 120 volt, 20-ampere branch circuit. Device shall have nominal sensitivity to ground leakage current of five milliamperes and shall function to interrupt the current supply for any value of ground leakage current above five milliamperes (+ or – 1 milliamp) on the load side of the device. Device shall have a minimum nominal tripping time of 1/30th of a second. Devices shall meet UL 943.

5.

Safety Type Duplex Receptacles:

a.

Bodies shall be gray in color.

b.

Shall be hospital grade, as above with the following additional requirements.

1) Shall permit current to flow only while a standard plug is in the proper position in the receptacle.

2) Screws exposed while the wall plates are in place shall be the tamperproof type.

6.

Isolated Ground Type Duplex Receptacles:

a.

Bodies shall be orange in color.

b.

Shall be hospital grade and UL listed as “Isolated Ground”.

7.

Duplex Receptacles (not hospital grade): Shall be the same as hospital grade duplex receptacles except for the "hospital grade" listing and as follows.

a.

Bodies shall be brown phenolic compound supported by a plated steel mounting strap having plaster ears.

b.

Shall be NEMA WD 1 heavy duty type.

C.

Receptacles; 20, 30 and 50 ampere, 250 volts: Shall be complete with appropriate cord grip plug. Devices shall meet UL 231.

D.

Weatherproof Receptacles: Shall consist of a duplex receptacle, mounted in box with a gasketed, weatherproof, cast metal cover plate and cap over each receptacle opening. The cap shall be permanently attached to the cover plate by a spring-hinged flap. The weatherproof integrity shall not be affected when heavy duty specification or hospital grade attachment plug caps are inserted. Cover plates on outlet boxes mounted flush in the wall shall be gasketed to the wall in a watertight manner.

E.

Lamp Receptacles for Outlet Box Mounting:

1.

For use on standard 75 mm (3 inch) and 100 mm (4 inch) outlet boxes.

2.

Keyless, porcelain body and skirt supporting a medium screw shell socket, and integral 3‑wire grounding receptacle shall have screw terminals and a minimum rating of 600 watts.

3.

Porcelain neck shall have shade holder groove.

2.2 TOGGLE SWITCHES and dimmers

A.

Toggle switches shall be totally enclosed tumbler type with bodies of phenolic compound. Toggle handles shall be ivory in color unless otherwise specified. The rocker type switch is not acceptable and will not be approved.

1.

Switches installed in hazardous areas shall be explosion proof type in accordance with the NEC and as shown on the drawings.

2.

Shall be single unit toggle, butt contact, quiet AC type, heavy‑duty general-purpose use with an integral self grounding mounting strap with break-off plasters ears and provisions for back wiring with separate metal wiring clamps and side wiring with captively held binding screws.

3.

Shall be color coded for current rating, listed by Underwriters Laboratories, Inc., and meet the requirements of NEMA WD 1, Heavy‑Duty and UL 20.

4.

Ratings:

a.

120 volt circuits: 20 amperes at 120-277 volts AC.

b.

277 volt circuits: 20 amperes at 120-277 volts AC.

5.

The switches shall be mounted on the striker plate side of doors.

6.

Incorporate barriers between switches with multigang outlet boxes where required by the NEC.

7.

Switches connected to isolated type electrical power systems shall be double pole.

8.

All toggle switches shall be of the same manufacturer.

B.

Dimmers: Incandescent modular dimming systems.

1.

Incandescent dimming system shall be 2000 watt modular type, with capability for "slaving" larger loads from the "master". System shall have capability of adding additional "slaves", controlled from the original basic dimmer "master". All units shall track with "master". Dimmers shall have low and intensity adjustment and built‑in transient voltage protection and fused on the load side. All remote mounted units shall be completely enclosed in integral metal housing. "Master", "Slaves" and controls shall be of the same manufacturer. All dimmers shall be listed by Underwriters Laboratories, Inc.

C.

Dimmers: Incandescent lamp loads. Wall‑mounted incandescent dimmers shall be specification grade with capability of raising and lowering the lighting from completely off at extreme counter‑clockwise rotation, to full intensity. Dimmers shall include an “off” position. Dimmers shall maintain full load rating even when two or more units are installed adjacent to one another. All wall‑mounted dimmers shall be of the same manufacturer.

D.

Dimmers: Fluorescent lamp loads. Wall‑mounted fluorescent lamp dimmers shall be specification grade with large control knob and shall be capable of raising and lowering the lighting from completely off at extreme counter‑clockwise rotation, to full intensity. Dimmers shall include an “off” position. Dimmers shall have low end intensity adjustment and maintain full load rating even when two or more units are installed adjacent to one another. All wall‑mounted dimmers shall be of the same manufacturer. Dimming ballast shall be provided for each F32 rapid start lamp or pair of lamps. Dimmers shall have adequate capacity for the load served and the environment in which installed.

2.3 WALL PLATES

A.

Wall plates for switches and receptacles shall be type smooth nylon. Oversize plates are not acceptable.

B.

Color shall be ivory unless otherwise specified.

C.

Standard NEMA design, so that products of different manufacturers will be interchangeable. Dimensions for openings in wall plates shall be accordance with NEMA WD1.

D.

For receptacles or switches mounted adjacent to each other, wall plates shall be common for each group of receptacles or switches.

E.

In psychiatric areas, wall plates shall have tamperproof screws and beveled edges.

F.

Wall plates for data, telephone or other communication outlets shall be as specified in the associated specification.

2.4 SURFACE MULTIPLE-OUTLET ASSEMBLIES

A.

Assemblies shall conform to the requirements of NFPA 70 and UL 5.

B.

Shall have the following features:

1.

Enclosures:

a.

Thickness of steel shall be not less than 1 mm (0.040 inch) steel for base and cover. Nominal dimension shall be 40 by 70 mm (1‑1/2 by 2‑3/4 inches) with inside cross sectional area not less than 2250 square mm (3.5 square inches). The enclosures shall be thoroughly cleaned, phosphatized and painted at the factory with primer and the manufacturer's standard baked enamel or lacquer finish.

2.

Receptacles shall be duplex, hospital grade. See paragraph 'RECEPTACLES' in this section. Device cover plates shall be the manufacturer's standard corrosion resistant finish and shall not exceed the dimensions of the enclosure.

3.

Unless otherwise shown on drawings, spacing of the receptacles along the strip shall be 600 mm (24 inches) on centers.

4.

Wires within the assemblies shall be not less than No. 12 AWG copper, with 600 volt ratings.

5.

Installation fittings shall be designed for the strips being installed including bends, offsets, device brackets, inside couplings, wire clips, and elbows.

6.

Bond the strips to the conduit systems for their branch supply circuits.

PART 3 ‑ EXECUTION

3.1 INSTALLATION

A.

Installation shall be in accordance with the NEC and as shown as on the drawings.

B.

Ground terminal of each receptacle shall be bonded to the outlet box with an approved green bonding jumper, and also connected to the green equipment grounding conductor.

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