SECTION 16170 MOTOR AND CIRCUIT DISCONNECTS

This spec was part of the Des Plaines, IL River WRF project that bid Feb 26, 2015.


SECTION 16170

MOTOR AND CIRCUIT DISCONNECTS



PART 1 GENERAL

1.1 RELATED REQUIREMENTS

A. Applicable requirements of Division 0 and Division 1 shall govern work in this Section.

1.2 SCOPE

A. Provide disconnect switches for the safe disconnection of motorized equipment and other equipment as required by the national and state electrical codes, O.S.H.A., and as specified herein.

1.3 SHOP DRAWING SUBMITTALS

A. Enclosure dimensions nameplate nomenclature, electrical ratings, and fuse and breaker type listing.

B. Field quality control test results.

1.4 PRODUCT DELIVERY, STORAGE AND HANDLING

A. Do not store exposed to weather.

B. Protect against damage from work of other trades.


PART 2 PRODUCTS

2.1 ACCEPTABLE MANUFACTURERS

A. General Electric

B. Siemens

C. Square D

D. Cutler-Hammer\Eaton

2.2 DISCONNECT RATINGS

A. UL listed short circuit rating. 200,000 RMS amps with Class R fuses.

2.3 SAFETY SWITCH CONSTRUCTION

A. Twenty amp, one pole, non-fusible.
1. Toggle type operator.
2. Toggle guard capable of locking switch in the on or off position.
3. Rated 1HP at 120 volts AC.

B. Switches other than twenty amp, one pole.
1. NEMA heavy duty Type HD.
2. Dual cover interlock.
3. Visible blades.
4. Provisions for control circuit interlock (aux. contacts). Once Form C set of aux. contacts is required for each disconnect associated with a VFD-driven load.
5. Pin type hinges.
6. Tin plated copper current carrying parts.
7. Quick make and break operator mechanism.
8. Handle attached to box, not cover.
9. Handle position indication, ON in up position and OFF in down position.
10. Padlock provisions for up to three padlocks in OFF position.
11. UL listed lugs for type and size of wire specified.
12. Spring reinforced fuse clips for Type R fuses where fusible disconnect is indicated or required.
13. Provisions for insulated or grounded neutral.

2.4 ENCLOSED CIRCUIT BREAKER CONSTRUCTION

A. Dual cover interlock.

B. External trip indication.

C. Provisions for control circuit interlock.

D. Padlock provisions for up to three padlocks in OFF position.

E. Handle attached to box, not cover.

F. Handle position indicates ON, OFF, or TRIPPED.

G. Provisions for insulated or grounded neutral.

2.5 ENCLOSURES

A. Indoor dry areas. NEMA 1 code gauge steel with rust inhibiting primer and baked enamel finish.

B. Indoor damp or below grade. NEMA 3R.

C. Indoor wet.  NEMA 4.

D. Outdoor. NEMA 4.

E. Corrosive Area.  NEMA 4X Type 304 stainless steel with brushed finish.

F. Hazardous Area. NEMA 7/9 cast, copper free, aluminum alloy.

2.6 NAMEPLATES

A. Engraved laminated plastic type.

B. Letters 1/2 in. high.

C. Black letters on white background.

D. Identify per equipment controlled.


PART 3 EXECUTION

3.1 GENERAL

A. Provide a disconnect switch for each motorized load and for each electrical heating load, whether indicated on the drawings or not.  Each local disconnect switch shall be located within line-of-sight of the associated load, and shall be suitably rated. The Contractor shall provide a pedestal in each case where there is no suitable vertical surface for mounting a disconnect switch. Some equipment is furnished with an integral or loose disconnect switch, so the Contractor shall review all specifications to determine what equipment is furnished with a disconnect switch. The Contractor shall include in their bid all disconnect switches required whether indicated on the drawings or not.

3.2 INSPECTION

A. Examine area to receive disconnect to assure adequate clearance for installation.

B. Start work only after unsatisfactory conditions are corrected.

3.3 INSTALLATION

A. Install in accordance with manufacturer's written instructions, applicable requirements of NEC and NECA's "Standard of Installation," and in accordance with recognized industry practices.

B. Locate disconnect switches as shown on drawings or as required by NEC.

C. Install on equipment support where feasible, or anchor firmly to wall or structural surface.

D. Provide control circuit interlock as required by NEC.

E. For each disconnect switch associated with an ASC, provide two #12 wires in a ¾” conduit back to the ASC.

3.4 ADJUSTMENT

A. Adjust covers and operating mechanism for free mechanical movement.

B. Verify overcurrent protection to provide proper operation and compliance with NEC.

C. Tighten wire and cable connections.

D. Clean interior of enclosure.

E. Touch up scratched or marred surfaces to match original finish.



END OF SECTION