10
2.2
Making the AC Input Connections
Before beginning any work inside the charger, ensure that all incoming AC supply is de-energized. Verify that no
voltage is present inside the case by using a voltmeter at all input and output terminals. Check that the source
voltage and frequency match 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)
Minimum Wire Size
Requirement for
Customer Connection
Equipment
Grounding
Conductor Minimum
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 4 – 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.
