24
031-295-B0-001, Rev. B (11/2018)
2.0 Installation, continued
2.4.1 Installation
Tools required for floor-mounting configuration:
• Masonry drill and bit
• Vacuum for dust removal
• Qty 3, 1/2" x 1-1/2" Masonry anchor bolts
• Hand drill with 5/32" bit
Concrete surface installation:
1. Position the enclosure and use as template to mark drilling locations of 3 mounting holes.
2. Drill holes for anchor bolts, (remove dust as necessary) and install inserts.
3. Position empty cabinet over inserts.
4. Secure cabinet with bolts, lock washers and flat washers.
2.5 Connecting the Utility Power
Utility power enters the enclosure through an 0.875" knockout on the side or rear of the NPS. The enclosure accepts 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 (400A, 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 (heating and air-conditioning) 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.
Description
Alpha Part
Number
Square D Part Number
240V Installation — HACR (15A)
470-224-10
QO215
120V Installation — High-Magnetic (20A)
470-017-10
QO120HM
120V Installation — High-Magnetic (15A)
470-013-10
QO115HM
BBX — External Service Disconnect
020-085-10
QO2-4L70RB
BBX — External Service Disconnect
020-141-10
QO8-16L100RB
• 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.
ATTENTION:
ONLY qualified personal should connect the utility power. Power must be connected in compliance with local
electrical codes, and common safety practices must be observed.
WARNING! ELECTRICAL HAZARD
Table 2-1, Service Entrance Circuit Breaker Requirements
