7
2.2
AC Input Connections
Before beginning any work inside the charger, ensure the following:
•
Verify 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.
•
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. If multi-tap charger
is set for 120VAC input configuration, feeder breaker should be double the size of the AC protection. 120VAC
configured multi-tap chargers use both breaker poles in parallel.
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 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. Refer to the schematic diagram for AC input
connections.
