Conduit bodies

Status
Not open for further replies.
ryan_618

ryan_618

Senior Member
Location
Salt Lake City, Utah
314.17 tells me that
314.17 Conductors Entering Boxes, Conduit Bodies, or Fittings.
Conductors entering boxes, conduit bodies, or fittings shall be protected from abrasion and shall comply with 314.17(A) through (D).

(D) Conductors 4 AWG or Larger. Installation shall comply with 300.4(F).
Click to expand...
300.4 says:
(F) Insulated Fittings. Where raceways containing ungrounded conductors 4 AWG or larger enter a cabinet, box enclosure, or raceway, the conductors shall be protected by a substantial fitting providing a smoothly rounded insulating surface, unless the conductors are separated from the fitting or raceway by substantial insulating material that is securely fastened in place.
Exception: Where threaded hubs or bosses that are an integral part of a cabinet, box enclosure, or raceway provide a smoothly rounded or flared entry for conductors.
Conduit bushings constructed wholly of insulating material shall not be used to secure a fitting or raceway. The insulating fitting or insulating material shall have a temperature rating not less than the insulation temperature rating of the installed conductors.
Click to expand...
Notice that the exception does not include conduit bodies...but then again, neither does the charging language of the code section. I can't think that a conduit body would require a plastic bushing (in fact, I'm not sure that it is even possible), but the code sure seems to require it! :eek:

Comments :confused: ??
 
Re: Conduit bodies

That is intresting Ryan, :) please do not start inspecting out this way, I have no idea how to put a bushing in a conduit body. :eek:
 
Re: Conduit bodies

I almost always install T&B Insuliners in larger conduit bodies and weather heads. I?m not sure that they are really made for this but I feel more comfortable having the wires resting against hard plastic instead of the metal fitting which is sometimes pretty sharp.

con_rigidandintermediatemetalconduitfittings16_2.gif

High dielectric nylon, 105 ? C. An insuliner sleeve snapped into a regular bushing makes a U.L. Listed insulated bushing. For standard rigid conduit, E.M.T. (thinwall conduit) or any standard bushed outlet. Especially suitable for use with flexible metallic conduit. Converts ordinary bushing to code approved insulated bushing without disturbing wiring.
 
Re: Conduit bodies

Perhaps it is because a larger wire can push its own insulation system into a sharp metal object by the force of its own weight.
 
Re: Conduit bodies

I wonder the same thing about the wire size. Do you suppose flexibility has anything to do with it? Larger diameter wire tends to be much stiffer to work with.

Bob
 
Status
Not open for further replies.
Top