hazardous locations

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It sounds to me like your doing homework? If you have a NEC code book you can look it up by looking at the index in back of the book.
If you don't have a code book you should get one ASAP.
It's has all your answers in it.
 
Sparkwatts,

The minimum as I understand it is 5/8 of an inch for 1/2 inch conduit. As FC has put it the index might help you through the code. Generally the sealant should be no less than the diameter of the raceway.
 
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