Some types of explosionproof enclosures are designed to be drilled and tapped in the field. When this is done, at least________ full threads should be engaged between the conduit and the enclosure.
A) three
B) five
C) seven
D) 11

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The Answer of Some types of explosionproof enclosures are designed to be drilled and tapped in the field. When this is done, at least________ full threads should be engaged between the conduit and the enclosure.
A) three
B) five
C) seven
D) 11

Some Types of Explosionproof Enclosures Are Designed to Be Drilled