SECTION 26 27 02

EQUIPMENT WIRING SYSTEMS

BASED ON DFD MASTER ELECTRICAL SPEC DATED 03/01/21

 
PART 1 - GENERAL

 
SCOPE

The work under this section includes electrical connections to equipment specified under other Divisions and/or Sections, or furnished by Owner, including, but not limited to:

-Misc. Equipment

-HVAC and Plumbing motors, VFDs, and panels

-Coolers & Freezers

-Kitchen, Dishwashing and Laundry Equipment

Included are the following topics:

 

PART 1 - GENERAL

              Scope

              Related Work

              Submittals

              Coordination

PART 2 - PRODUCTS

              Cords and Caps

              Other Products

PART 3 - EXECUTION

              Inspection

              Preparation

              Installation

              Miscellaneous Connections

              HVAC and Plumbing Connections

              Cooler and Freezer Wiring

              Kitchen, Dishwashing and Laundry Equipment Connections

              Equipment Connection Schedule

 

SUBMITTALS

Product Data:  Provide data for cord and wiring devices.

 

COORDINATION

Coordinate all equipment requirements with the various contractors and the Project/Construction Manager.  Review the complete set of drawings and specifications to determine the extent of wiring, starters, devices, etc., required.

 

PART 2 - PRODUCTS

 

CORDS AND CAPS

Straight‑blade Attachment Plug: NEMA WD 1.

Locking‑blade Attachment Plug: NEMA WD 5.

Attachment Plug Configuration: Match receptacle configuration at outlet provided for equipment.

Cord Construction: Oil‑resistant thermoset insulated multi-conductor flexible cord with identified equipment grounding conductor, suitable for hard usage in damp locations.

Cord Size: Suitable for connected load of equipment and rating of branch circuit overcurrent protection.

 
OTHER PRODUCTS

Refer to related sections for other product requirements.

 

PART 3 - EXECUTION

 

INSPECTION

Verify that equipment is ready for electrical connection, wiring, and energizing.

Working space for equipment shall be provided that is likely to require examination, adjustment, servicing or maintenance per NEC 110.26(A)(1) table.

 
PREPARATION

Review equipment submittals prior to installation and electrical rough‑in.  Verify location, size, and type of connections.  Coordinate details of equipment connections with supplier and installer.

 
INSTALLATION

Use wire and cable with insulation suitable for temperatures encountered in heat‑producing equipment.

Provide a green equipment ground conductor for all installed equipment wiring.

Make conduit connections to equipment using flexible PVC-coated metal conduit.

Requirements of NEC Article 300.22 shall apply for boxes, conduit, conduit connections to equipment, devices and luminaire located in Mechanical Plenum spaces.

Install pre‑finished cord set where connection with attachment plug is indicated or specified, or use attachment plug with suitable strain‑relief clamps.

Provide suitable strain‑relief clamps for cord connections to outlet boxes and equipment connection boxes.

Make wiring connections in control panel or in wiring compartment of pre‑wired equipment in accordance with manufacturer's instructions.  Provide interconnecting wiring where indicated.

Install disconnect switches, controllers, control stations, and control devices such as limit switches and temperature switches as indicated.  onnect with conduit and wiring as indicated.

All 120V single phase motor operated equipment such as fan coil units, unit heaters, door operators, shall be provided with a SSY, 2 gang combination plug fuse holder/ switch mounted adjacent to equipment.

HVAC AND PLUMBING CONNECTIONS

Provide all power wiring including all circuitry carrying electrical energy from panelboard or other source through starters, variable frequency drives (VFDs), controller overcurrent protection and disconnects to motors or to packaged control motor protection panels. 

Packaged control motor protection panels may include disconnects and starters and overcurrent protection.  Provide all wiring between source and packaged control  motor protection panel and motors. Install panel on exterior wall or adjacent to AHU’s.

Contractor shall verify with mechanical contractor the electrical requirements including voltages, horsepower, disconnecting means, starters and variable frequency drives for motors and equipment prior to ordering circuit breakers, disconnects, controller overcurrent protection devices and starters.

VFD Installations: Input power wiring shall be installed in a separate conduit, output power wiring shall be installed in a separate conduit and control wiring shall be installed in a separate conduit. Do not mix input power, output power, or control wiring in a common conduit. Separate conduits for input and output power wiring shall be provided for each motor.

VFD Installations: Output power wiring for more than one motor shall not share a common conduit.  

Provide 120 volts to each temperature control panel. Coordinate quantity and exact locations with HVAC/DDC contractors.

Unless otherwise specified, all electrical  control devices such as aqua-stats, float and pressure switches, fan powered VAV boxes, switches, electro-pneumatic switches, solenoid valves and damper motors requiring mechanical connections shall be furnished and installed and wired by the Contractor supplying the devices.

Provide 120V, single phase 20 ampere combination lighting and convenience outlet circuit and switching means to serve  field installed receptacles and interior lighting within each HVAC unit. Each access section shall contain a minimum of one marine grade light fixture/ luminaire.  Sections wider than 6 feet shall have multiple LED light fixtures/luminaire with maximum spacing of 6 feet. Provide separate junction box at exterior of air handling unit.

All conduit penetrations to AHU’s shall be sealed by electrical contractor. See Casing Penetrations in 23 73 13, 23 73 23 and 23 73 24 for exact requirements.

Each motor terminal box shall be connected with a minimum 12", maximum 36" piece of flexible PVC-coated metal conduit to a fixed junction box. When connections are located in Mechanical Plenum spaces located within Mechanical equipment, flexible metal conduit shall be utilized.  Conduit must be installed perpendicular to direction of equipment vibration to allow conduit to freely flex.

Provide separate junction box for each engineered supply, return/relief/exhaust system at exterior of air handling unit for [208V][480V], 3-phase source.

All wiring shall be routed in conduit and a minimum of 12 AWG wire shall be used for all luminaires, switches and convenience outlets.  All lighting, switches and convenience outlet circuits shall be a minimum of 20 amperes.    

Provide local disconnect within each walk-in HVAC units to serve as line-of-site local motor disconnect. Disconnect enclosure shall be NEMA 4X stainless steel.

Check for proper rotation of each motor.

All heating, air conditioning and refrigeration equipment installed on the exterior of the building or rooftop shall have a 120V, single phase, 20 ampere rated outlet at an accessible location within 25 feet of the equipment.


COOLER AND FREEZER WIRING

Provide rigid metal conduit or IMC for all surface wiring in coolers and freezers.  Whenever possible avoid the use of surface wiring and run conduit in space behind or above insulated panels. PVC shall not be routed exposed inside units.

Coolers and Freezers: Cut and seal conduit openings in freezer and cooler walls, floor, and ceilings.

Provide RMC, IMC or non-metallic nipple and sealing fittings whenever conduit pierces wall of cooler or freezer.  Provide grounding conductor.

All openings cut in walls of cooler or freezer shall be patched and insulation integrity shall be maintained.  Patching shall be approved by freezer or cooler installer.

Install all wiring for lighting, switches, evaporator, coil fans, compressors, interlocks, defrost heaters, door heaters, drain heaters, alarms, or any other electric devices supplied with unit.

Freezer and refrigeration drain lines with freeze protection wrap (heat trace) shall be served from a dedicated circuit protected with a Ground Fault Protection (GFP) circuit breaker with a protection level of 30 milliamps and higher.

Seal all conduits entering and leaving temperature-controlled areas.


KITCHEN, DISHWASHING AND LAUNDRY EQUIPMENT CONNECTIONS

Check loose equipment delivered to job by equipment installer against approved shop drawings or other required Drawings. Delivered equipment shall be listed by a Nationally Recognized Testing Laboratory.

Loose electrical equipment including disconnects, starters, thermostats, controls, local and remote switches furnished by equipment contractor shall be installed by electrical contractor.

 

Review dimensioned equipment layouts, detailed shop drawings of equipment, wiring, control and final connection diagrams available from the equipment supplier.

 

Provide non-fused disconnect switches serving equipment. Equipment installed in damp or wet locations shall be provided with NEMA 4X enclosures.

 

Provide Rigid Metal Conduit (RMC) or Intermediate Metal Conduit (IMC) for all surface conduit and fittings in these spaces.

 

Equipment contractor will receive all equipment and position in place.

 

Electrical Contractor shall rough in for equipment only from approved equipment shop drawings.

 

Rough in location shall be within three inches of equipment.  If direct connection is required, use liquid-tight flexible conduit.  If receptacle connection is required, verify proper receptacle configuration with equipment installer.

 

Final connections shall include extension of all service to each piece of equipment.  All labor and material required to completely connect the equipment ready to operate shall be included in the final connections.  All control wiring not integral with equipment shall be included.

 

Provide all required power and control wiring.  This may include (but is not limited to) the following:

 

Provide switch in hood and branch circuit for integral light fixtures.

 

Provide pushbutton switch or manual starter for exhaust fan.

 

Provide emergency branch circuit for fire suppression system (if applicable).  Wire automatic heat detectors or manual station so, when activated, valve of dry chemical bottle opens, gas solenoid valve shuts down, all dampers close, and make-up fans shut down, electrical power contactor opens (integral in equipment), and building fire alarm system is activated.  Provide all required wiring, conduit and final connections.  Refer to wiring diagrams supplied with equipment.

 

Provide wash-down system wiring; refer to schematic wiring diagrams supplied with hoods.  Interconnect fire prevention system with wash-down system so wash-down system is activated upon alarm.

 
EQUIPMENT CONNECTION SCHEDULE

See Approved MEP Drawings

As indicated on the drawings.

 

END OF SECTION