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Electrical Notes - Quantech 3070TSE Manual

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Electrical Notes

QUANTECH
1. Minimum Circuit Ampacity (MCA) is based on 125% of the rated load amps for the
largest motor plus 100% of the rated load amps for all other loads included in the cir-
cuit, per N.E.C. Article 430-24. If the optional Factory Mounted Control Transformer
is provided, add the following MCA values to the electrical tables for the system
providing power to the transformer: -17, add 2.5 amps; -28, add 2.3 amps; -40, add
1.5 amps, -46, add 1.3 amps; -58, add 1 amps.
2. The minimum recommended disconnect switch is based on 115% of the rated load
amps for all loads included in the circuit, per N.E.C. Article 440.
3. Minimum fuse size is based upon 150% of the rated load amps for the largest motor
plus 100% of the rated load amps for all other loads included in the circuit to avoid
nuisance trips at start-up due to lock rotor amps. It is not recommended in applica-
tions where brown outs, frequent starting and stopping of the unit, and/or operation
at ambient temperatures in excess of 95ºF (35ºC) is anticipated.
4. Maximum fuse size is based upon 225% of the rated load amps for the largest mo-
tor plus 100% of the rated load amps for all other loads included in the circuit, per
N.E.C. Article 440-22.
5. Circuit breakers must be UL listed and CSA certified and maximum size is based
on 225% of the rated load amps for the largest motor plus 100% of the rated load
amps for all other loads included in the circuit. Otherwise, HACR-type circuit break-
ers must be used. Maximum HACR circuit breaker rating is based on 225% of the
rated load amps for the largest motor plus 100% of the rated load amps for all other
loads included in the circuit.
6. The "INCOMING WIRE RANGE" is the minimum and maximum wire size that can
be accommodated by the unit wiring lugs. The (2) preceding the wire range indi-
cates the number of termination points available per phase of the wire range speci-
fied. Actual wire size and number of wires per phase must be determined based on
the National Electrical Code, using copper connectors only. Field wiring must also
comply with local codes.
7. A ground lug is provided for each compressor system to accommodate a field
grounding conductor per N.E.C. Table 250-95. A control circuit grounding lug is also
supplied.
8. The supplied disconnect is a "Disconnecting Means" as defined in the N.E.C. 100,
and is intended for isolating the unit for the available power supply to perform main-
tenance and troubleshooting. This disconnect is not intended to be a Load Break
Device.
9. Field Wiring by others which complies to the National Electrical Code & Local Codes.
FORM QTC3-EG6 (1118)
39

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