8
1.3
Making the AC Input Connections
Before making any connections to the A77 ensure that the AC Power is off at the main breaker box and that
both of 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 1.2 Changing Transformer Taps
). Select wire size, using the table below,
based on an overload current of 110-115% of the input current listed on the charger nameplate.
BREAKER WIRE
SIZE
EQUIPMENT
SIZE REQUIREMENT
GROUNDING
(AMPS) FOR
CUSTOMER
CONDUCTOR
CONNECTION MINIMUM
3
#14 #14
5
#14 #14
10
#14 #14
15
#12 #12
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 - Wire Size Minimum Requirements
NOTE: These are recommended sizes. All National 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. Run
the input AC wiring to terminals marked
L1
and
L2
in the charger (for chargers with transformer taps use the
table on the previous page for input connections).
Summary of Contents for A77
Page 7: ......
