MNL- 0345
Page 106 Section A Base Edition
A.4.2.3 Electrical Installation
A.4.2.3.1 Electric Drive
When making the electrical connections to the system, the following instructions are mandatory:
• Comply with all local, state and federal regulations concerning electrical installation.
• Arrange for the electrical connections to be made by a certified electrician only.
• Ensure that the motor voltage, control unit voltage, and frequency conform with the main voltage
and frequency. Do not connect the compressor unit to a voltage other than the one specified on the
nameplate.
• Provide all necessary cables and main fuses and a master disconnect switch. The fusing of the
compressor must be carried out in compliance with local, state and national electrical regulations.
A.4.2.3.2 Electrical Supply
The machine is factory wired according to order. If the voltage is to be changed, consult the factory for
instructions and necessary parts.
For standard models the only customer wiring necessary is from the customer supplied disconnect switch
to the compressor unit’s electrical enclosures All wiring should be done by a licensed electrician familiar
with national, state and local electrical codes.
The use of improperly sized wire can result in sluggish operation, unnecessary tripping of overload relays
and/or blowing of fuses. The following tables are provided as a guide for proper wire size.
1 PHASE
Motor
hp
Full Load Amps
Fuse Amps
a
a. Dual element time delay fuse amps.
Minimum Wire Size
b
b. Normal copper wire with THW, THWN, or XHHW insulation.
120V 208V 230V 120V 208V 230V 120V 208V 230V
2 24 13.2 12 30 20 17.5 10 --- 14
3 34 18.7 17 50 30 25 8 10 10
5 56 30.8 28 80 50 40 4 8 8
7.5 80 44 40 100 70 60 3 8 8
10 --- 55 50 --- 90 60 --- 6 6
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