EMT STRAPING

Merry Christmas
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Jim I think a lot of times when we think 'why did they do this?' that the answer is they did not, at least no directly.

Sometimes when you make or change a rule one place it effects other rules in strange ways.

I do see your point about the 5' exception.

This nipple question might be solved by just putting in a proposal.

I have not supported many EMT nipples between enclosures and have never had a an inspector question it. I think if the installer uses some common sense most inspectors would as will as well.

If I have 2 enclosures 24" apart and I run an unsupported 2" EMT between them it will be rock solid and I doubt an inspector would have an issue with it. I would not do the same thing with 1/2" EMT.
 
sandsnow said:
When does a type of conduit or tubing change from Nipple to Raceway???

That's the $64,000 question!!!
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For our purposes I think it is safe to say 24"

Chapter 9 Note (4)
Where conduit or tubing nipples having a maximum length not to exceed 600 mm (24 in.) are installed between boxes, cabinets, and similar enclosures, the nipples shall be permitted to be filled to 60 percent of their total cross-sectional area, and 310.15(B)(2)(a) adjustment factors need not apply to this condition.
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That suggests along with 310.15(B)(2)(a) that nipples can be longer than 24" but there will be no gain from calling a 36" raceway a nipple.

JMO, Bob
 
I would have said that a short straight section of raceway would be OK without a strap since there is no real moment arm to allow the application of torque to unscrew the connections. As soon as you place bends (an offset for instance), knocking into the raceway can provide torque to loosen it. Sorry the Engineer in me is showing this morning. Just my opinion.

Mark
 
I think this thread proves that the NEC as written is not perfect, and common sense must be used in applying it. I'll bet we spend much more time disecting the NEC than the cmp's do. :)
 
??In general connectors are not considered to be raceway supports.??
358.30 doesn?t require a ?raceway support?, just says ?securely fastened?.
I think a connection to a box is securely fastened.


?"For the purpose of this section, Type MC cable fittings shall be permitted as a means of cable support.?"
This is from 330.30-D-2 for unsupported cables, and does not apply to other sections. They have already thrown out the rule-book here for fishing cables through concealed spaces. (and talks about supporting, not securing)
 
as far as im concerned, a 'NIPPLE' is a RACEWAY 24'' or less in length

if you ask a supply house for a 13 inch emt NIPPLE, or a 19 inch PVC NIPPLE, they will probably laugh, sell you a 10 foot stick of pipe and a hacksaw

put your pipe in
make it solid
make it safe
put wire in it
move on to the next part of the project

an inspector is NOT going to gig you on 3 foot of straight pipe between 2 light fixtures 10 feet in the air as long as it looks like it might stay there for .... until he forgets about it
:)
 
izak said:
as far as im concerned, a 'NIPPLE' is a RACEWAY 24'' or less in length

if you ask a supply house for a 13 inch emt NIPPLE, or a 19 inch PVC NIPPLE, they will probably laugh, sell you a 10 foot stick of pipe and a hacksaw

put your pipe in
make it solid
make it safe
put wire in it
move on to the next part of the project

an inspector is NOT going to gig you on 3 foot of straight pipe between 2 light fixtures 10 feet in the air as long as it looks like it might stay there for .... until he forgets about it
:)
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Now if you can back that up with a code number it would be nice.The code says EMT must be strapped within 3 feet.Yes seems many would pass it if not but it does not meet code.Where does it say rules change at 10 feet up ?
 
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