Insulated throat grounding bushing

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I have general questions as follows: what are insulated throat grounding bushing and what are they used for application wise? Can they be used for application such as NEC 2014 section 250.92(B) or 250.97 or not?

 

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Duplicate:

Conduit bonding jumper sizing

I have plans which say following notes: 1. Install an insulated throat ground bushing on each metallic service entrance conduit. Bond to ground bus using conductor that is size based on Table 250.66 2. Install an insulated throat grounding bushings on each metallic feeder conduit. Bond to...

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