114201I – System Installation Manual
10
Service Panel Voltage = _____________ Input Voltage ___
Yes /
___No
•
Does the output voltage on the ID label match the voltage your loads (protected equipment)
need?
Load Voltage = ______________ Output Voltage ___Yes/___No
If you answered NO to either of the preceding questions,
call SERVICE
.
4.
Now, use the information you wrote down in Step 2 to find the correct circuit breaker for the
service panel that is for your system.
Table 5.1 Recommended Circuit Breaker for Maximum Input Current
System
Input Voltage (Vac)
Max. Current
Recommended
Circuit Breaker
16.7 KW
120 / 208
58
70
16.7 KW
277 / 480
25
35
24 KW
120 / 208
84
100
24 KW
277 / 480
36
45
33 KW
120 / 208
115
150
33 KW
277 / 480
50
60
40 KW
120 / 208
139
175
40 KW
277 / 480
60
80
50 KW
120 / 208
174
225
50 KW
277 / 480
75
90
** WARNING: THE EXTERNAL INPUT CIRCUIT BREAKER PROTECTING THE SYSTEM MUST
BE A “MOTOR START”, DELAYED TRIP TYPE. THIS IS DUE TO MAGNETIC INRUSH
CURRENT DRAWN DURING APPLICATION OF AC POWER. PLEASE NOTE THAT
THIS APPLIES TO ANY UNIT THAT HAS A DIFFERENCE BETWEEN THE INPUT AND
THE OUTPUT VOLTAGES.
5.
Write down the circuit breaker value that applies to your system from Table 5.1:
6.
Now, look at Table 5.2 below, and use the notes below to find the proper gauge wire or the
recommended circuit breaker recorded in step 5.
Table 5.2 Recommended Minimum Wire Sizes
Read These Important Notes!
For this Input
Circuit Breaker
Size...
Use this Size 90°C
Copper Wire
This table lists the AWG and mm2 wire size for each circuit breaker size.
The minimum recommended circuit breaker sizes for each model and
voltage application are listed in Table 5.1. The temperature rating of
conductor must not be less than 90° C wire. Based on the ampacities
given in Tables 310-16 of the National Electrical Code, ANSI/NFPA 70-
1993 (Table 2 of the CEC), and NEC article 220 (CEC Section 4). Circuit
conductors, must be the same size (ampacity) wires and equipment-
grounding conductors must meet Table 250-95 of the National Electrical
Code. Code may require a larger wire size than shown in this table
because of temperature, number of conductors in the conduit, or long
service runs. Follow local code requirements.
AWG
mm
2
10, 15, 20
12
3.31
25, 30
10
5.26
35, 40, 45
8
8.36
50, 60
6
13.30
70, 80
4
21.15
90, 100
2
33.62
110 1
42.11
125 1/0
53.49
150, 175
3/0
67.43
225 4/0
74.40
