Alpha Technologies PWE-6FT - Manual (Page 24)

24 031-259-B0-001, Rev A
2.0 Installation, continued
2.5 Connecting the Utility Power
The following 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.
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.
2.5.1 Wiring the Utility Service
Utility power enters the enclosure through a 1-1/8" opening at the bottom or rear of the
PWE series, or through an optional breaker box. The enclosures accept a standard
electrical fitting.
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 for 120V installations, and HACR breakers for 240V installations .
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.
Table 2-1, Service Entrance Circuit Breaker Requirements
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