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The loop wiring method (rings) is not permitted in North America.
 

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You can't loop a wire between a breaker and a motor starter?
Would you explain more clearly what you're talking about? I've been in this trade for a heck of a lot of years, and I'm genuinely puzzled about what you mean.
 

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Discussion Starter · #7 ·
Would you explain more clearly what you're talking about? I've been in this trade for a heck of a lot of years, and I'm genuinely puzzled about what you mean.
I see a lot of manufactured panel boards (breakers, contactors, input and output boards, etc), there is usually a loop between the breaker and the contactor to allow for expansion and contraction and also to hang the occassional ammmeter. The size of the loop is a bit puzzling in the NEC and a handfull of quarreling engineers. 300-34 says 8 times the diameter of the wire but that is a huge number and doesn't make sense.
 

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I see a lot of manufactured panel boards (breakers, contactors, input and output boards, etc), there is usually a loop between the breaker and the contactor to allow for expansion and contraction and also to hang the occassional ammmeter. The size of the loop is a bit puzzling in the NEC and a handfull of quarreling engineers. 300-34 says 8 times the diameter of the wire but that is a huge number and doesn't make sense.
Gotcha. That's installer's preference. There are bend radius requirements for cable and such, but not for conductors. With or without a loop of any diameter is compliant.

I thought for a minute you were talking about a ring main.
 
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