Alpha Technologies LPE Enclosure - Manual (Page 19)

031-302-B0-001 Rev A
19
• Connection to utility power must be approved by the local utility before installing the power supply.
• Electrical codes require that a service disconnect switch be connected between the utility power source and
the Alpha power supply.
• Connection to the power supply must include an appropriate service entrance weather head.
ATTENTION
ONLY qualified personnel should connect the utility power. Power must be connected in
compliance with local electrical codes, and common safety practices must be observed.
WARNING!
2.0 Installation, continued
2.5 Connecting the Utility Power
Utility power enters the enclosure through an .875" knockout on the side or rear of the LPE. The
enclosure accepts a standard electrical fitting.
A “high-magnetic” trip circuit breaker must be used in order to accommodate the high-inrush currents
associated with the start-up of transformers (400A, no-trip, first-half cycle). Do not replace this circuit
breaker with a conventional service entrance circuit breaker. 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.
Description Alpha Part Number Square D Part Number
120V Installation — High-Magnetic (20A) 470-017-10 QO120HM
120V Installation — High-Magnetic (15A) 470-013-10 QO115HM
US BBX — External Service Disconnect 744-656-20 QO2-4L70RB
CAN BBX — External Service Disconnect 744-656-21 QO2-L70RB