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2 utility power connection, Installation description, Alpha part number square d part number – Alpha Technologies CESC User Manual

Page 11

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2.2

Utility Power Connection

CAUTION:

The “Utility Power Connection” procedure must ONLY be performed by qualified
service personnel and in compliance with local electrical codes and common safety
practices. Connection to utility power must be approved by the local utility before
installing the power supply.

NOTE:

UL and NEC require that a service disconnect switch (UL listed) be provided by the
installer and be connected between the power source and the ALPHA power supply.
Connection to the power supply must include an appropriate service entrance weather
head.

Wiring the Utility Service

NOTE:

A “high-magnetic” trip circuit breaker must be used in order to accommodate the
high-inrush currents normally associated with the start-up of ferroresonant
transformers (400 Amp, no-trip, first half cycle). Do not replace this circuit breaker
with a conventional service entrance circuit breaker. Alpha recommends Square D
circuit breakers ONLY, because of increased reliability in this powering application.

Alpha Technologies offers a high-magnetic Square D circuit breaker and a BBX option (a UL Listed

service entrance). Contact your local sales representative for more information.

In most cases, the following configurations (see next page) qualify for service

entrance use, however, other codes may apply. Always contact your local utility to

verify that the wiring conforms to applicable codes.

11

031-106-C1-001 Rev. A

2. Installation

Description

240V Installation — HACR (15A)

120V Installation — High-magnetic (20A)

120V Installation — High-Magnetic (15A)

BBX — External Service Disconnect

Alpha Part Number

Square D Part Number

470-224-10

470-017-10

470-013-10

020-085-10

QO215

QO120HM

QO115HM

QO2-4L70RB

470-017-10

QO8-16L100RB

BBX — External Service Disconnect

020-141-10

Table 2-1 Service Entrance Circuit Breaker Requirements