Utility Power Connection Notes
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.
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 active load
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
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 that the wiring
conforms to applicable codes.
ATTENTION:
XM2-300HP Connections
When bonding the box to a neutral plate is required, 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 is protected by a single-pole, 20 Amp High Magnetic (HM) circuit
•
breaker inside the service entrance.
Checked NEC CODE to verify proper wire AWG (suggested wire gauge is 12AWG).
•
Equipped with a grounding clamp, on the enclosure, to facilitate dedicated grounding.
•
9
017-877-B1-001 Rev. A
