Maximum Current Draw Of Racks; Short Circuit Current Rating (Sccr) - ETC DRd6-12-120 Installation Manual

M a x i m u m C u r r e n t D r a w o f R a c k s
Rack Type
DRd6
AX6
DRd12
AX12
AX12X
N o t e :
S h o r t C i r c u i t C u r r e n t R a t i n g ( S C C R )
DRd6
DRd6 with AX6 rack (MCB)
DRd12
DRd12 with AX12 Main Lug rack
DRd12 with AX12X (cross-bussed) Main Lug rack 22,000A
DRd12 with AX12 Main Circuit breaker
DRd12 with AX12X Main Circuit breaker
6
Phase Type
Single Phase (1Ø)
Three Phase (3Ø)
Single Phase (1Ø)
Three Phase (3Ø)
Single Phase (1Ø)
Three Phase (3Ø)
Single Phase (1Ø)
Three Phase (3Ø)
Single Phase (1Ø)
Three Phase (3Ø)
1
Connected to DRd rack enclosure with a full complement of 20A modules.
2
Connected to two DRd rack enclosures with a full complement of 20A modules.
3
Installed in a main circuit breaker (MCB) model auxiliary rack.
4
Wire bending space limits the feed to the AX12X-MCB rack to 400A maximum.
ETC installs a 100% rated two pole breaker (or two poles from a three pole
breaker) in the AX12X-MCB, for a total deliverable current of 400A in a single
phase (split phase) configuration.
Rack Configuration
Maximum Suggested
Current Draw Breaker Rating
120A 150A
80A 100A
1
120A 150A
1
80A 100A
240A 300A
160A 200A
1
240A 300A
1
160A 200A
2
480A 400A
2
320A 400A
SCCR at
100-120
VAC
22,000A
100,000A
22,000A
22,000A
100,000A
100,000A
®
Unison DRd Rack Enclosure Installation Manual
3
3
3
3
4
3
SCCR at
240 & 277
VAC
22,000A
65,000A
22,000A
22,000A
22,000A
65,000A
65,000A