5
2.3
Making the AC Connections
Before making any connections to the AUPS, ensure that the AC power is off at the main breaker box and the
AC Bypass line. Check that the source voltage and frequency matches the voltage and frequency listed on the
AUPS nameplate. For systems with transformer taps, verify that the tap has been set to the correct AC input.
(See Section 2.2.1 for instructions on changing the transformer tap). Select wire size, using the table below,
based on the input protection - breaker/fuse size.
NOTE:
Feeder breaker should be sized to match the size of the AC protection used in unit. For systems with
120/240/208V Rectifier AC input:
•
120 VAC input arrangement has breaker poles wired in
parallel
o
Example: ACB = 40 amp. Input protection = 80 amps.
•
240/208 VAC input arrangement has breaker poles wired in
series
o
Example: ACB = 40 amp. Input protection = 40 amps.
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.
Summary of Contents for 7.5K-A1-BD3-125V100A
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