2" conduit entering Class-1/Div.-1

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nhee2 said:
If the conduit is larger than 2" it needs a seal. 501.15(A)(1)(2)
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This aspect is a little confusing - if you look closely at 501.15(A)(1)(2) it states enclosure
"entry is metric designator 53 (trade size 2) or larger..."
to me this indicates a 2" conduit run could be reduced to a 1-1/2" hub at the enclosure entry and would not need a seal.

However, if you look at Commentary Table 501.1 it states seal is required "If conduit is size 2 or larger, in conduit run within 18" of enclosure"... it doesn't say anything about the enclosure entry size.
 
Dale001289 said:
This aspect is a little confusing - if you look closely at 501.15(A)(1)(2) it states enclosure
"entry is metric designator 53 (trade size 2) or larger..."
to me this indicates a 2" conduit run could be reduced to a 1-1/2" hub at the enclosure entry and would not need a seal.

However, if you look at Commentary Table 501.1 it states seal is required "If conduit is size 2 or larger, in conduit run within 18" of enclosure"... it doesn't say anything about the enclosure entry size.
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I'm making the (possibly wild) assumption that "Table 501.1" comes from the NEC Handbook. `If it did, it's one of the reasons I haven't used it in over 15 years. "This Code is not intended as a design specification or an instruction manual for untrained persons." [Section 90.1] applies to the Handbook authors as well.
 
Dale001289 said:
Thanks for clarification - but yes I always use the handbook.


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Well, it's better in some parts than others; but it's woefully deficient in Articles 500 to 516. I guess it's OK to raise a question but I've seen it misunderstand several issues. Basically the Handbook commentary is taken from what the authors think the various Public Input (PI) and CMP Panel Statement (PS) sources say. I've seen the Handbook misinterpret several over the years - some where I was the PI author.
 
This is news to me. I thought the Handbook was by same authors as the NEC - with their own explanations. Now I am a little apprehensive about the interpretations.
As far as chapter 500 is concerned as long as you're around we'll always get it straight.


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Dale001289 said:
This is news to me. I thought the Handbook was by same authors as the NEC - with their own explanations. Now I am a little apprehensive about the interpretations.
As far as chapter 500 is concerned as long as you're around we'll always get it straight.


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You need to read the Handbook introduction.
 
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