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YORK INTERNATIONAL

FORM 150.62-NM7 (103)

ELECTRICAL NOTES AND LEGEND

NOTES:

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 circuit, per N.E.C. Article 430.33. If the Factory-mounted
Control Transformer is provided, add the following to the system MCA values in the electrical tables for the
system supplying power to the optional transformer. -50, add 1.75 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 440.12 (A) 1.

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 ap pli ca tions where brown outs, frequent starting and stopping of the unit, and/or op er a tion at
ambient tem per a tures in excess of 95°F is anticipated.

4. Maximum fuse size is based upon 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, per N.E.C. Article 440.22.

5. Circuit breakers must be U.L. listed and CSA certifi ed 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. Ex cep tion:
YCAL0043 and YCAL0057 must have the optional factory overloads installed to use a standard circuit breaker.
Oth er wise, an HACR-type circuit break ers must be used. Maximum HACR circuit break er 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 indicates the number of ter mi na tion points available per phase
of the wire range specifi ed. Actual wire size and number of wires per phase must be determined based on the
National Elec tri cal Code, using copper con nec tors only. Field wiring must also comply with local codes.

7. A ground lug is provided for each compressor system to accommodate a fi eld grounding con duc tor per N.E.C.

Table 250.122. A control circuit grounding lug is also supplied.

8. The supplied disconnect is a “Disconnecting Means” as defi ned in the N.E.C. 100.I, and is intended for iso lat ing

the unit for the available power supply to perform maintenance 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 and Local Codes.

VOLTAGE CODE

-50 = 380/415-3-50

LEGEND

ACR-LINE ACROSS -THE-LINE START

C.B. CIRCUIT BREAKER

D.E. DUAL ELEMENT FUSE

DISC SW DISCONNECT SWITCH