Rockwell Automation Allen-Bradley Kinetix 6000, User Manual

Page: 177 / 268

Publication 2094-UM001A-EN-P — September 2006
Specifications and Dimensions 177
Circuit Breaker/Fuse Specifications
While circuit breakers offer some convenience, there are limitations
for their use. Circuit breakers do not handle high current inrush as
well as fuses. The Kinetix 6000 needs to be protected by a device
having a short circuit interrupt current rating of the service capacity
provided or a maximum of 100,000 A.
If an upstream circuit protection device is rated for the overload
current and short circuit rating, a supplementary circuit protection
device (such as the 1492 product) can be used as the only
Kinetix 6000 branch circuit protection device. The upstream fully rated
device let-through must be less than or equal to the 10 kA interrupt
rating of the 1492 circuit protection device.
The wiring interconnection in the figures below provide examples of
the needed protection and follows UL and NEC codes. Full
compliance is dependent on final wiring design and installation.
Circuit Protection under NEC 1999 110-10 (preferred fully rated devices)
Circuit Protection under NEC 1999 110-10 (allowed but no longer preferred)
Required Protection
under 110-10 of
NEC 1999
Preferred Fully
Rated Breakers
Distribution
Blocks
Fully Rated
Fused
Disconnect
Fully Rated
Breaker
Drive Drive Drive
Fully Rated
Fused
Disconnect
Fully Rated
Breaker
Breakers Selected
for Device Protection
Fully Rated Short Circuit
Interrupt Capability
Required Protection
under 110-10 of
NEC 1999
Preferred Fully
Rated Breakers
Fully Rated
Fused
Disconnect
Fully Rated
Breaker
Breakers Selected
for Device Protection
Fully Rated Short Circuit
Interrupt Capability
Required Protection
under 110-10 of
NEC 1999
Allowed But
No Longer Preferred
Distribution
Blocks
Traditional
Current Limit
Fused
Disconnect or
Breaker
Rated for
Short Circuit
Available
Limiting to
Short Circuit
Rating of Down
Stream Breaker
Breakers Selected
for Device Protection
With Limited Short
Circuit Interrupt
Capability
Drive
Drive Drive
Required Protection
under 110-10 of
NEC 1999
Allowed But
No Longer Preferred
Traditional
Current Limit
Fused
Disconnect or
Breaker
Rated for
Short Circuit
Available
Limiting to
Short Circuit
Rating of Down
Stream Breaker
Breakers Selected
for Device Protection
With Limited Short
Circuit Interrupt
Capability
Distribution
Blocks