Alpha Technologies XM3-HP Series - Technical Manual - Manual (Page 11)

Utility Power Connection Notes
Local regulatory authorities may require the use of an approved service entrance and/or service disconnect switch when
the Power Supply is installed in an outdoor enclosure. Alpha enclosures have switch options. The installer may need to
provide these if using a non-Alpha enclosure.
Connecting to the utility should be performed only by qualified service personnel and in compliance with local electrical
codes. Connection to utility power must be approved by the local utility before installing the Power Supply.
ATTENTION:
In order to accommodate the high-inrush currents normally associated with the start-up of ferroresonant
transformers (400 Amp, no-trip, first-half cycle), either a “high-magnetic” or an HACR (Heating, Air Conditioning,
Refrigeration) trip breaker must be used. Do not replace these breakers with a conventional service entrance
breaker. Alpha recommends ONLY Square D breakers because of the increased reliability required in this powering
application. High-magnetic Square D circuit breakers and a BBX option (UL Listed service entrance) are available
from Alpha Technologies.
NOTE:
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
BBX - External Service Disconnect 020-085-10 QO2 -4L70RB
BBX - External Service Disconnect 020-141-10 QO8-16L100RB
In most cases, the following configurations qualify for service entrance use when wiring a duplex receptacle to a service
disconnect. Other codes may also apply. Always contact your local utility to verify the wiring conforms to applicable codes.
ATTENTION:
XM3-HP Connections
When it is required to bond the box to a neutral plate, use the long green bonding screw provided (Alpha P/N
523-011-10, Square D P/N 40283-371-50).
NOTE:
Proper 120VAC 20A service requires the installation site be:
• Equipped with a 120VAC duplex receptacle which provides power to the Power Supply and peripheral
equipment.
• Have a NEMA 5-20R receptacle protected by a single-pole, 20 Amp High Magnetic (HM) circuit breaker inside
the service entrance.
• Checked to NEC/CEC Code or with your local regulatory authority to verify proper wire AWG (suggested wire
gauge is 12AWG).
• Equipped with a grounding clamp on the enclosure to facilitate dedicated grounding.
Alpha enclosures are engineered to properly vent the Power Supply. The Power Supplies have been investigated by
regulatory authorities for use in various Alpha enclosures. If you are using a non-Alpha enclosure, it is your responsibility
to ensure your combination conforms to your local regulatory requirements and the Power Supply remains within its
environmental specifications.
NOTE:
11 017-882-B0-001 Rev. C2 (10/2013)