8
2.2
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 match the voltage and
frequency listed on the charger front nameplate specifications. Also, confirm if charger is multi or single input by
referring to charger nameplate. If charger is confirmed to be a multi-input charger, refer to corresponding charger
schematic or AC input wiring chart inside charger for transformer tap settings. 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
Table 5 – 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. Install
the input AC cables to the AC input terminals of the charger.
