7
2.3
AC Input Connections
Before beginning any work inside the charger, ensure that all incoming AC supply power is off at the main
breaker box and the charger’s breakers are off. Check that the source voltage and frequency matches the
voltage and frequency listed on the charger nameplate. For chargers with transformer taps, verify that the tap
has been set to the correct AC input (see Section 2.2.1 for instructions on changing the transformer tap). Select
wire size using the table below. This is based on an overload current of 110-115% of the input current listed on
the charger nameplate.
NOTE: Feeder breaker should be sized to match the size of the AC protection used in charger.
Breaker Size/
Fuse Size -
Amps
AWG Minimum Wire
Size Requirement for
Customer Connection
AWG Minimum Wire
Size for Equipment
Grounding
3
#14 #14
5
#14 #14
10
#14 #14
15
#14 #14
20
#12 #12
25
#10 #12
30
#10 #10
40
#8
#10
50
#8
#10
60
#6 #10
70
#6 #8
80
#4 #8
90
#4 #8
100
#4
#8
125
#2 #6
150
#1 #6
175
#1/0 #6
200
#2/0 #6
250
#4/0 #4
300
250 MCM
#4
400
400 MCM
#2
500
600 MCM
#2
Table 6 – AC/DC & Ground Wire Size Minimum Requirements
(All wires specified in the table are rated at 90 °C or 194 °F)
NOTE: These are recommended sizes per La Marche Standards. The National Electrical Code (NEC) and Local
Wiring Codes must be followed.
AC Connection Procedure
First connect an adequate earth ground lead (use table above for sizing) to the terminal marked “GROUND” or
“GND”. Run the input AC wiring to terminals marked L1 and L2 or L3 on the terminal block TB1 inside the
charger (for chargers with transformer taps, use the table on page 7 for input connections).
Summary of Contents for A36D
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