3837Service Equipment

3837.1SCOPE

Provide service equipment for controlling and distributing electrical power, providing over-current protection, and a means to cut-off power to items of electrical Equipment as part of a traffic control signal system, Lighting System, automatic traffic recorder system, or other electrical system.

3837.2REQUIREMENTS

A Service Equipment A.1 General For the service, provide and install as specified in the Contract and the following:

In addition, for wood poles, provide and install conduit risers and weather head as specified in the Contract. For installations on wood poles, size the service conductors that run above the disconnecting means and through the meter socket to the weather head for the rating of the service disconnect. Ensure these service conductors meet the requirements of the elec tric utility company and extend beyond the weather head for connection to the service conductors from the source of power. Provide parts of the service Equipment that use copper conductors and have connections that are NRTL listed for use with copper conductors. Refer to NEC , Article 100 for the definition of the term “Listed.” A.2 Meter Socket Use a commercial-type meter socket with the following:

the lugs without cutting

The electric utility company will provide and install the meter. A.3 Circuit Breaker Load Center Unless otherwise specified in the Contract, provide a disconnecting means meeting the following:

Use a load center with a front cover and inner dead front cover capable of easy removal for installation, maintenance, and wiring. Ensure the front cover is hinged at the top with a slip-hinge arrangement that allows the cover to be left in an open position, and a snap closure at the bottom. Provide lugs for service conductor connections in the load center that are NRTL -listed for use with copper wire. Provide solder-less, set screw-type lugs, sized for the conductors assigned to each lug. Provide the circuit breaker load center with an isolated, bondable neutral bar with the capacity to accept the number and size of neutral and grounding conductors as specified in the Contract or the NEC. Ensure neutrals bond in accordance with NEC. Provide and install circuit breakers in the load center as specified in the Contract. Label the circuit breakers with the “on” and “off” positions and with the load carried. Provide circuit breakers and load center enclosures from the same manufacturer. A.4 General Duty Safety Switch Use a general duty safety switch with an isolated, bondable neutral bar capable of accepting the numbers and sizes of neutral and grounding conductors as specified in the Contract or the NEC. Ensure bonding of the neutral in accordance with NEC. If specified in the Contract, provide a disconnecting means with the following:

Ensure lugs contained in the safety switch are sized for the conductor Material and size assigned to each lug. Provide the required fuses. A.5 Heavy Duty Safety Switch Install a safety switch to turn off power to the sign lights. Provide a safety switch with the following:

zinc-coated with a gray finish

240/480 V sign Lighting System

may use 4-wire, 3-pole Install the safety switch in a vertical upright position. A.6 Enclosed Main Circuit Breaker If specified in the Contract, provide and install an enclosed main circuit breaker as shown on the Plans for cutting power to the electrical system or systems. Mount the circuit breaker in a NEMA 3R rain-tight enclosure for outdoor use. Provide a circuit breaker with the following:

carrying If lugs are needed to connect the feeder conductor to the breaker, provide NRTL -Listed, solder-less, set screw-type lugs for use with copper wire. Include provisions for a padlock on the rain-tight enclosure. A.7 Signal Service Cabinet Type SSB Provide a signal service cabinet with the following:

Use signal service cabinets Type SSB listed on the APL, Signals. Provide uninterrupted power supplies for signal service cabinets listed on the APL, Signals. Use batteries for uninterrupted power supplies listed on the APL, Signals. For signal service cabinets Type SSB, use the anchor rods and hardware supplied with the cabinets. B Transformer and Circuit Breaker Assembly B.1 Transformer Provide an outdoor, general purpose, dry-type transformer meeting the following:

Provide transformers and related wiring compartments that are NRTL-listed for indoor-outdoor applications, and meeting the requirements of relevant NEMA and IEEE standards. Mount the transformer on the Equipment pad as specified in the Contract and as approved by the Engineer. B.2 Enclosed Circuit Breaker To protect the transformer provide the following:

use

needed for feeder conductor connections to the breaker

approved by the Engineer

3837.3SAMPLING AND TESTING

Submit six sets of manufacturer’s drawings and Specifications for the proposed transformer and circuit breaker assembly to the Engineer for approval. After approval, the Engineer will distribute the drawings to the following: