GUIDE SPECIFICATION SECTION 230511 - 1
Revised 16 February 2016 Electrical Provisions for HVAC Work
//INCLUDE THIS SECTION FOR PROJECTS IN WHICH THE MECHANICAL CONTRACTOR IS REQUIRED TO PROVIDE ALL ELECTRICAL WORK REQUIRED FOR HVAC EQUIPMENT. ALL ELECTRICAL WORK REQUIRED UNDER DIVISION 23 MUST BE PERFORMED BY A LICENSED ELECTRICAL CONTRACTOR.//
SECTION 230511 - ELECTRICAL PROVISIONS FOR HVAC WORK
PART 1 - GENERAL
RELATED DOCUMENTS
Drawings and general provisions of Contract, including General and Supplementary Conditions and Division1 Specification sections, apply to work of this section.
QUALITY ASSURANCE
For electrical equipment and products, comply with applicable National Equipment Manufacturers Association (NEMA) standards and refer to NEMA standards for definitions of terminology herein.
Comply with National Fire Protection Agency (NFPA) 70, National Electrical Code (NEC) for workmanship and installation requirements.
Comply with NFPA 70E, Standard for Electrical Safety in the Workplace, while performing any electrical work. NFPA 70E is referenced in OSHA 29CFR Part 1910, Subpart S, Appendix A, and is considered by OSHA as the industry practice for electrical safety.
//DELETE THE FOLLOWING REQUIREMENTS IF THERE ARE NO NEW PANELBOARDS REQUIRED.//
Panelboards shall be in accordance with the following:
Comply with applicable requirements of UL Standard 67, "Electric Panelboards," and Standards 50, 869, 486A, 486B, 489, and 1053 pertaining to panelboards, circuit breakers, accessories and enclosures. Provide units that are Listed and Labeled.
Comply with NEMA Publications No.250, Enclosures for Electrical Equipment (1000 Volts Maximum), No.PB 1, Panelboards, and No.PB 1.1, Instructions for Safe Installation, Operation and Maintenance of Panelboards Rated 600 Volts or Less.
All electrical work provided under Division 23 shall be performed by an Electrical Contractor duly licensed by the state in which the project is located. Submit name and license number of Electrical Contractor with the Schedule of Values required by the General Conditions.
SUBMITTALS
General: Submittals shall demonstrate compliance with technical requirements by reference to each subsection of this specification. Where a submitted item does not comply fully with each and every requirement of the Specifications, the submittal shall clearly indicate such deviations. Identification requirements for non-complying features of items are very specific. See Section 230210 for exact requirements.
Manufacturer's Data: Submit manufacturer's technical product data and installation instructions for electrical materials and products.
Source Limitations: Provide motor starters, combination motor starters, and disconnects through one source from a single manufacturer.
DESCRIPTION OF WORK
Work includes, but is not necessarily limited to the following:
Provide electrical wiring, raceway, starters, disconnect switches, etc. to serve all Division 23 equipment and components provided. All electrical work must be accomplished by a licensed Electrical Contractor.
Starters shall be sized in accordance with the latest edition of the NEMA standard ratings for magnetic starters and the NEC.
NEMA Starter Sizes for Motors /NEMA
Starter Size / Maximum HP for System Voltage (V)/ Phase (PH) /
120V/1PH / 240V/1PH / 208V/3PH / 240V/3PH / 480V/3PH /
00 / 1/3 / 1 / 1-1/2 / 1-1/2 / 2
0 / 1 / 2 / 3 / 3 / 5
1 / 2 / 3 / 7-1/2 / 7-1/2 / 10
2 / 3 / 7-1/2 / 10 / 15 / 25
3 / 7-1/2 / 15 / 25 / 30 / 50
4 / - / - / 40 / 50 / 100
Provide disconnect switches for all equipment under this Division. Disconnect switches shall be sized in accordance with the latest edition of the NEC for single motor applications as follows:
Disconnect Switch Sizes for Motors /Switch Rating Amps (A) / Maximum HP at System Voltage (V))/ Phase (PH) /
120V/1PH / 208V/1PH / 240V/1PH / 208V/3PH / 240V/3PH / 480V/3PH /
30A / 1-1/2 / 3 / 3 / 5 / 7-1/2 / 15
60A / 3 / 7-1/2 / 10 / 15 / 15 / 30
100A / 5 / 10 / 10 / 25 / 25 / 60
200A / - / - / - / 50 / 60 / 100
400A / - / - / - / 100 / 125 / 250
600A / - / - / - / 150 / 200 / 400
Disconnect switches shall be sized for all other applications based on total kW rating of the equipment as follows:
Disconnect Switch Sizes for EquipmentSwitch Rating / Maximum kW at System Voltage (V)/ Phase (PH)
Amps (A) / 120V/ 1PH / 208V/
1PH / 240V/ 1PH / 277V/ 1PH / 208V/ 3PH / 240V/ 3PH / 480V/ 3PH
30A / 2.8 / 5.0 / 5.8 / 6.6 / 8.6 / 10.0 / 19.9
60A / 5.8 / 10.0 / 11.5 / 13.3 / 17.3 / 19.9 / 39.9
100A / 9.6 / 16.6 / 19.2 / 22.2 / 28.8 / 33.2 / 66.4
200A / 19.2 / 33.3 / 38.4 / 44.3 / 57.6 / 66.4 / 132.9
400A / 38.4 / 66.6 / 76.8 / 88.6 / 115.1 / 132.9 / 265.7
600A / 57.6 / 99.8 / 115.2 / 133.0 / 172.7 / 199.3 / 398.6
Dual element fuses shall be provided with disconnect switches. Fuses shall be sized based on the nameplate rating for the equipment.
Equipment enclosures for disconnect switches, starters, variable frequency drives, control panels and any other panel enclosures housing electrical equipment shall be rated based on NEMA standard ratings. Panel enclosures shall be suitable for the environment in which they will be installed. Unless noted otherwise, provide NEMA rated enclosures based on the following environment conditions:
NEMA Enclosure Ratings for Electrical Equipment /NEMA Type / Environment Condition /
1 / Indoors only, dry, low dust, and non-corrosive environment
3R / Outdoors, weatherproof and rainproof
4 / Outdoors, watertight and raintight
4X / Same as 4 plus corrosion resistant
7 / Hazardous locations Class I, Groups A, B, C, or D
9 / Hazardous locations Class II, Groups E, F, or G
12 / Indoors subject to circulating non-hazardous dust, or dripping non-corrosive liquids
Provide all single phase interlock and control wiring required for sequenced operation of mechanical devices provided for mechanical systems under Division 23.
Provide all power wiring for mechanical equipment as recommended by the equipment manufacturer, in accordance with the NEC.
Provide duct smoke detectors indicated on the Drawings and incorporate smoke detectors into interlock and control wiring.
Provide appropriate access doors at each duct smoke detector in accordance with Section 232116.
PART 2 PRODUCTS
MOTOR STARTERS
Motor Starters: Provide surfacemounted, heavy duty, steel enclosed motor starters with NEMA size rating, voltage rating, and current rating based on the tables provided in Part 1 of this specification.
Motor starters are three pole types. Starters shall be rated as follows unless otherwise specified:
For 480Y/277 V: Use 600 volt type
For 208Y/120 V: Use 250 volt type
For 120/240 V: Use 250 Volt type
Provide full voltage, non-reversing magnetic motor starters with auxiliary control devices as indicated.
Provide units with RMS symmetrical fault withstand rating suitable for application, but no less than 22,000 amps. Design of units shall ensure that faults will be contained within the starter enclosure.
// EDIT FOLLOWING PARAGRAPH AS REQUIRED FOR PROJECT. THERMAL OVERLOAD PROTECTION IS STANDARD.//
Running Overload Protection: Equip with //solid state electronic//thermal overload protection// device for each motor circuit.
Auxiliary Contacts: Provide two sets of normally open auxiliary contacts and two sets of normally closed auxiliary contacts.
Provide additional sets of normally open and/or normally closed auxiliary contacts is such are required to accomplish control functions as defined by the drawings or required by specified control and interlock sequence(s).
Provide additional sets of contacts as required to operate pilot lights as described elsewhere. Contacts required to operate pilot lights are not shown on the Drawings. Contacts required to operate pilot lights are to be furnished at no additional cost.
Accessories on Cover: Provide the following accessories on the combination starter cover.
Reset Pushbutton
Hand-Off-Automatic (HOA) Switch
Push to Start Switch
Pilot Lights on Cover: Pilot lights are to be transformer types, configured to operate from the same voltage as the motor starter coil. Provide the following pilot lights on the starter cover.
Red Pilot Light, illuminated when starter is energized
Green Pilot Light, illuminated when starter is not energized
Disconnect Auxiliary Contacts: Provide 2 pole disconnect auxiliary contacts for control circuits where control circuits are provided from a separate electrical source.
Coils: Provide starters with operating coils for 120 volts.
Control Transformer: Provide control transformer having a primary voltage rating to match the line-to-line voltage of the motor supplied by the starter and a secondary voltage to match the voltage of the starter coil. Size control transformer to supply the starter and all pilot devices supplied with a 25% reserve capacity for additional pilot devices.
Provide NEMA-rated enclosure type suitable for its environment as required by Section 230511.
COMBINATION MOTOR STARTERS
General: Combination starters may be used in lieu of separate disconnect and motor starter. Provide surfacemounted, heavy duty, steel enclosed combination motor starters meeting requirements described for motor starters. Provide combination motor starters with NEMA size rating, voltage rating, current rating, and number of poles indicated on the Drawings.
Circuit Breakers: Provide factoryassembled, moldedcase circuit breakers with permanent instantaneous magnetic trips in each pole, with faultcurrent interrupting rating suitable for application and ampere ratings as indicated. Circuit breaker ratings must be clearly visible when the compartment door is open without the necessity of removing operating mechanisms or similar items to obtain visibility. Where adjustable circuit breakers are provided, such adjustments must be also be readily accessible once the compartment door is opened. Provide pushtotrip feature for testing and exercising circuit breaker trip mechanism. Construct breakers for mounting and operating in any physical position and in ambient temperature of 40°C. Provide with AL/CU rated screw type removable connector lugs. Field coordinate all circuit breaker sizes with equipment nameplate ratings prior to purchase.
Disconnect Operators: Provide external operator handles for circuit breakers. Design handle with updown motion and with down position indicating “OFF." Combination Motor Starters with rotary type circuit breaker operators are not acceptable. Construct handles which permit locking handle in “ON” or “OFF” position with a hasp-type padlock.
Provide two-pole interlock switches for all disconnects that are used with utilization equipment requiring control connections provided from separate electrical sources. The interlock switch is to be configured such that when the disconnect is open the interlock switch is open.
Provide additional interlock switches, auxiliary contacts, plumbing key interlocks, or other accessories as may be described by the Drawings.
Provide NEMA-rated enclosure type suitable for its environment as required by Section 230511.
CIRCUIT AND MOTOR DISCONNECTS
Safety Switches: Provide surfacemounted, heavy duty, steel enclosed safety switches, of types, voltage rating, current rating, and number of poles indicated in this Section.
Switches with no drawing indication of number of poles are three pole types. Switches shall be fusible type, rated as follows unless otherwise specified:
For 480Y/277 V.: Use 600 Volt type, with neutral and grounding bus.
For 208Y/120 V.: Use 250 Volt type, with neutral and grounding bus.
For 120/240 V.: Use 250 Volt type, with neutral and grounding bus.
Where a neutral is not provided to the specific utilization equipment served, the neutral bus can be bonded to the enclosure and used as a grounding bus.
Provide horsepower rated switches incorporating quickmake, quickbreak type switches constructed so that switch blades are visible in OFF position with door open. Equip with operating handle which is integral part of enclosure base and whose operating position is easily recognizable. Internal current carrying components shall be high conductivity copper; switch contacts shall be silvertungsten type. Fuse holders shall have positive pressure type reinforced fuse clips. Where non-fused disconnect switches are indicated, provide solid copper bus bars in lieu of fuses.
Provide NEMA-rated enclosure type suitable for its environment as required above.
Provide switches that may be locked in either the “ON’ or ‘OFF’ condition with a 1/4" shackle hasp-type lock. Safety switches shall have door interlocks that prevent the door from opening when the operating handle of the switch is in the “on” position. Manual defeat mechanisms shall be provided for the interlocks.
Provide two-pole interlock switches for all disconnects that are used with utilization equipment requiring control connections provided from an alternate power source. The interlock switch is to be configured such that when the disconnect is open the interlock switch is open.
Provide additional interlock switches, auxiliary contacts, mechanical key interlocks, or other accessories as described by the Drawings.
For all outdoor equipment, provide a fused weatherproof disconnect switch, sized and fused in accordance with manufacturer's requirements.
Fuses shall be furnished by the Contractor. Fuses shall be current limiting type with a minimum AIC rating of 100,000 AMP. The contractor shall furnish Owner with one complete set of spare fuses at the completion of the project.
VARIABLE FREQUENCY DRIVES
Install and coordinate electrical requirements for variable frequency drives in accordance with Section 230514.
PANELBOARDS AND CIRCUIT BREAKERS
Branch Circuit Panelboards: Provide factory assembled, dead front safety constructed, branch circuit panelboards of the circuit breaker type, in sizes and ratings indicated. Provide panelboard switching and protective devices in quantities, ratings, types, characteristics and with arrangement indicated. Panelboards shall be equipped with anti-turn solderless pressure type main lug connections approved for use with copper conductors. Construct panelboards with rectangular shaped bus bars of solid copper, with conductivity not less than 98%, which are securely mounted and braced, and with solderless lugs bolted to main bus bars. Panelboards specified with dual lugs for sub-feed shall include dual lugs for each phase at the point of termination. Feed-through bus arrangements are not acceptable.
Panelboards shall have full sized neutral bus and bare un-insulated ground bus suitable for bolting to enclosures. Panelboards shall have voltage ratings suitable for service voltage at which they will be used. Provide suitable lugs on neutral bus for outgoing feeders requiring neutral connections. Provide molded case main and branch circuit bolt-on breaker types for each circuit, with toggle handles that indicate when tripped. Branch circuit breakers for switching lighting circuits shall be Type “SWD”’ those used for switching high intensity discharge lighting circuits, Type “HID”.”