securing wire to conduit

Status
Not open for further replies.
S

SiddMartin

Senior Member
Location
PA
Is it a violation to wire-ty MC to a supported conduit? I read the code section in Chap. 3, and believe it is a violation b/c the conduit is not rated as a support. Am I correct in this? Is there any exceptions that would allow you to do this?


Thanks
 
SiddMartin said:
300.11(b)(1) it says "means of support" would that be considered the ty-wrap or the conduit?
Click to expand...
Thats a deeper question than first meets the eye 300.11 (B)(1) says raceway or means of support. IMOP I say raceway. Means of support could be cable tray.
 
so do we agree that you can not do it? And after reading 300.11 (B) I still dont understand how or when you can do it
 
Sid, here is commentary from the NECH.

The purpose of 300.11(B)(3) is to prevent cables from being attached to the exterior of a raceway. Electrical, telephone, and computer cables wrapped around a raceway can prevent dissipation of heat from the raceway and affect the temperature of the conductors therein. This section also prohibits the use of a raceway as a means of support for nonelectric equipment, such as suspended ceilings, water pipes, nonelectric signs, and the like, which could cause a mechanical failure of the raceway.


However, 300.11(B)(2) does allow the installation of Class 2 thermostat conductors for a boiler or air conditioner unit to be supported by the conduit supplying power to the unit, as shown in Exhibit 300.13. These Class 2 circuits are functionally associated with the branch-circuit wiring method.
Click to expand...


Roger
 
SiddMartin said:
300.11(b)(1) it says "means of support" would that be considered the ty-wrap or the conduit?
Click to expand...

That depends on how it's installed.

You press the MC up against the conduit and ty-wrap around those 2 items only. . The ty-wrap would be a support and the conduit would also be a support.

You press the MC up against the conduit and ty-wrap around those 2 items and around a piece of building steel or strut. . The ty-wrap would be a support and the conduit would not be a support.

In both cases the MC is sandwiched up against the conduit.
 
Status
Not open for further replies.
Top