circuit breaker sizing

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gniehues

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one of the questions on a code test stated. What size circuit breaker is required if you have 3 current carrying conductors in a 5 foot piece of 1inch PVC conduit. Any suggestionson how to figure this?
 
Re: circuit breaker sizing

As a minimum, you would need to know the current drawn by the load and the type of load (i.e., motors, transformers, and lights have different rules). There could also be a trick to the question, if for example the conductors were too large to fit into that size and type of conduit. What kind of test was this?
 
Re: circuit breaker sizing

For grins & giggles--was there any options, like a multiple guess test? Or was this an open answer test?
My choice would be "I dunno"

Definately not enough info.
 
Re: circuit breaker sizing

Originally posted by georgestolz: Oh, I thought the question was "the secret of life, the universe, and everything."

No Hitchhiker's fans here?
Click to expand...
We're too busy trying to find out what happened to the dolphins. :D
 
Re: circuit breaker sizing

Originally posted by tshea: 6 X 7
Click to expand...
No. The question was eventually determined to be "What do you get when you multiply nine by seven?" And if anyone tries to use a calculator to prove that this does not work out to "42," then I would say that you do not understand the question. For more information, do a google search for Douglas Adams.
 
Re: circuit breaker sizing

Sure the question was not " what is allowed"
The 5ft of conduit will result in no derating.

So look at the chart and see what is the largest conductor allowed to be in 1' conduit in the amount of 3. Then look at the code for the max over current protection with no derating.
So many people over think these questions.

Atleast if you get it wrong you can argue your point with them.

[ March 22, 2005, 09:59 PM: Message edited by: bigjohn67 ]
 
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