liquidtite flexible metal conduit or nonmetallic

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Doesn`t the 6 ft max. rule apply to a free whip, from last point that is secured then to the unit ?? IMO sealtite as long as installed as told in 350.30 A + B it is compliant. The 6 ft rule applies to the last point it is secured at, then to the actual unit.
 
680.42 (A)(1)
680.42 Outdoor Installations
A spa or hot tub installed outdoors shall comply with the provisions of Parts I and II of this article, except as permitted in 680.42(A) and 680.42

(1) Flexible Conduit Liquidtight flexible metal conduit or liquidtight flexible nonmetallic conduit shall be permitted in lengths of not more than 1.8 m (6 ft).
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350.30 isn't applicable, it has been modified in 680.42


Roger
 
I agree with Roger, once you fall under Article 680.42 you'll have to stop at 6'. But as was asked in the OP does anyone know why?
 
sara1011@optonline.net said:
as was asked previously.........does any one know why?????????!!!!!!!! (thx trevor you re apparently the only one who read my inquiry)
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Sorry I don't know the answer.
 
sara1011@optonline.net said:
as was asked previously.........does any one know why?????????!!!!!!!! (thx trevor you re apparently the only one who read my inquiry)
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No, he is not the only one who read it, I did too, but I don't care about your question.

Sorry I addressed something else in your thread. :rolleyes:

Roger
 
Can't say as I know the answer either, but I offer a guess:

to limit possibility for mechanical damage exposing conductors (especially to the sharp metal)
 
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Kingpb, I don't think anybody in this thread thought there was a length limit to LFMC or LFNMC in chapter 1 through 4 applications but, when these chapters are suplemented or modified by chapters 5,6,or 7 we are in a different ball game.

Roger
 
roger said:
Kingpb, I don't think anybody in this thread thought there was a length limit to LFMC or LFNMC in chapter 1 through 4 applications but, when these chapters are suplemented or modified by chapters 5,6,or 7 we are in a different ball game.

Roger
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In reading the current NEMA RV3 document, dated 2006 and the corresponding bulletin, the understanding I get from the NEMA website on this topic, is that they have published this clarification and are proposing changes to the 2008 Code. I would expect then to see 680, and other sections modified to correct the 6' max length issue.

Until then, 6' is it for some applications. But the paper does answer the original post.
 
kingpb said:
I would expect then to see 680, and other sections modified to correct the 6' max length issue.
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I would not expect that for 2008.



17-139 Log #560 NEC-P17
Final Action: Reject​


(680.42)

​
​
____________________________________________________________​


Submitter:​
Brian Magilley, Current Electric​


Recommendation:​
Delete the following text:​

680.42(A)(1) Flexible Conduit. Liquidtight flexible metal conduit or
liquidtight flexible nonmetallic conduit shall be permitted in lengths of not
more than 1.8 m (6 ft).​

Substantiation:​
I do not see what purpose this 6 foot limitation serves. I feel​

that removing this section will allow for easier connection of the spa to the
required disconnect. If I set the required disconnect 5 feet from the edge of a
residential spa then I cannot run LFNMC the entire length from the disconnect
to the spa without using two different conduit types. Having the option of
running an unlimited length of LFNMC from the spa disconnect 5 feet away to
the spa control panel, would make the installation much quicker than having to
run say PVC (RNMC) from the disconnect up to the spa, and then make a
transition over the LFNMC to the spa control panel.​

Panel Meeting Action: Reject​

Panel Statement: ​
​

Other wiring methods are permitted precluding the use of​


LFMC.

​
​
Number Eligible to Vote: 11​

Ballot Results: ​
​

Affirmative: 11​


Comment on Affirmative:​


BLEWITT, T.: UL Guide Information for LFMC specifies the length
limitation when the metal jacket is part of the equipment grounding path:
?Where terminated in fittings investigated for grounding and where installed
with not more than 6 ft (total length) in any ground return path, liquid-tight
flexible metal conduit in the 3/8 and 1/2 (12 and 16) trade sizes is suitable for
grounding where used on circuits rated 20 A or less, and the 3/4, 1 and 1-1/4
(21, 27 and 35) trade sizes are suitable for grounding where used on circuits
rated 60 A or less.? Also see 250.118(5).​
​
​
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17-141 Log #511 NEC-P17​
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Final Action: Reject​


(680.42(A)(1))

​
​
____________________________________________________________​


Submitter:​
Mike Wilson, Mike Wilson Electrical Service / Rep. Wake County​

Electrical Contractors Association​

Recommendation:​
Revise text to read:​

Flexible Conduit. Liquidtight flexible metal conduit or liquidtight flexible
nonmetallic conduit shall be permitted in lengths of not more than 1.8 m (6 ft) .​

Substantiation:​
Flex that is 6 ft is not long enough to run from a control panel​

under the tub to a disconnect (5 ft) away. The tub is manufactured in an entry
on the left side. Control panel is (4 ft) from the side of the (text unreadable by
NFPA staff). A disconnect could not be (text unreadable by NFPA staff) using
(6 ft) of flex.​

Panel Meeting Action: Reject​

Panel Statement: ​
​

Other wiring methods are permitted precluding the use of​


LFMC.

​
​
Number Eligible to Vote: 11​

Ballot Results: ​
​

Affirmative: 11​


Comment on Affirmative:​


BLEWITT, T.: UL Guide Information for LFMC specifies the length
limitation when the metal jacket is part of the equipment grounding path:
? Where terminated in fittings investigated for grounding and where installed
with not more than 6 ft (total length) in any ground return path, liquid-tight
flexible metal conduit in the 3/8 and 1/2 (12 and 16) trade sizes is suitable for
grounding where used on circuits rated 20 A or less, and the 3/4, 1 and 1-1/4
(21, 27 and 35) trade sizes are suitable for grounding where used on circuits
rated 60 A or less.? Also see 250.118(5).​
​
​
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​
 
I ask AHJ and he told me if it has a ground wire, It can be longer. I do alot of pools and hot tube. I showed him 680.42(A) (1).
 
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