4
1.2.2 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 105%
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
Table 2 –
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.
1.2.3 Output Connections
Before connecting the battery and/or DC loads, it is recommended to apply AC power and set the configuration
for the correct output. See section 2.3 for the configuration instructions. Once the configuration is set, remove
AC power from the main breaker to the charger.
Select proper size for the DC wiring from the wire size table above (Table 4). If the distance between the
charger’s DC output and the DC load exceeds 10 feet, use the Power Cabling Guide on the next page to
minimize the voltage drop across the wire distance.