100 amp breaker | 4/0 cable

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  #1  
Old 07-16-14, 07:22 PM
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100 amp breaker | 4/0 cable

installing a 100 amp sub panel, distance requires 4/0 conductors, the 100 amp breakers will not accept the 4/0, are there adapter lugs available to resolve this issue?
 
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Old 07-16-14, 07:26 PM
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installing a 100 amp sub panel, distance requires 4/0 conductors, the 100 amp breakers will not accept the 4/0, are there adapter lugs available to resolve this issue?
Normally there are no larger lugs available for most residential 100 amp breakers. There are pin connectors available that must be special ordered and crimped to the feeder conductors, but the most commen method is to use split bolt or Polaris connectors in a junction box to reduce the wire size at the panel.
 
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Old 07-16-14, 07:31 PM
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4/0 AL is good for a 200 amp residential service , not 100 amps. Why is yours so large?
 
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Old 07-16-14, 07:43 PM
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the sub panel is 220' from the main panel.
 
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Old 07-16-14, 11:28 PM
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Feeder

310.15B(7)(2) cannot be used for a dwelling feeder where the feeder does not carry the entire dwelling load. That being said, unless your feeder will be operating at a very high demand I don't see a requirement for #4/0 AL.

#1/0 AL with an 80 amp load would be a 2.94% Volt Drop. #1/0 will probably fit into your breaker.

If you have the #4/0 already installed then as suggested, install a junction box and reduce the conductor at each end for a short distance into the panels for termination.
 
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