mc cable and plastic busings
- Thread starter big mac
- Start date
- Status
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: mc cable and plastic busings
Yes. See 330.17 which refers to 300.4.
Yes. See 330.17 which refers to 300.4.
curt swartz
Electrical Contractor - San Jose, CA
- Location
- San Jose, CA
- Occupation
- Electrical Contractor
Re: mc cable and plastic busings
Tom
300.4 Requires bushings in metal studs for type NM cable and ENT but not MC cable. Where are you seeing that they are required for MC cable?
[ May 19, 2003, 01:45 AM: Message edited by: curt swartz ]
Tom
300.4 Requires bushings in metal studs for type NM cable and ENT but not MC cable. Where are you seeing that they are required for MC cable?
[ May 19, 2003, 01:45 AM: Message edited by: curt swartz ]
daveselectric
Member
- Location
- Ohio
Re: mc cable and plastic busings
Curt is correct. But, you are required to hace cable supports for the MC.
Curt is correct. But, you are required to hace cable supports for the MC.
- Location
- Illinois
- Occupation
- retired electrician
Re: mc cable and plastic busings
Dave,
The reference in 330.30(A) to 300.4 would permit the installation of the MC through the holes in the studs without out additional securing or supports.
Don
Dave,
The reference in 330.30(A) to 300.4 would permit the installation of the MC through the holes in the studs without out additional securing or supports.
Don
luke warmwater
Senior Member
Re: mc cable and plastic busings
I believe the use of bushings with type MC is for the reduction of noise and a design issue.
I believe the use of bushings with type MC is for the reduction of noise and a design issue.
curt swartz
Electrical Contractor - San Jose, CA
- Location
- San Jose, CA
- Occupation
- Electrical Contractor
Re: mc cable and plastic busings
jbell
I agree with you that they don't appear to be required to ENT. I didn't read 300.4 last night, I just posted from memory and I thought they were required for ENT. I'll have to look back through some old code books to see if this changed but maybe they never were required and my memory is going. I don't use much ENT in metal stud work but can tell you from experience that it is almost impossible to pull it through punched holes without using plastic bushings because the groves catch on the studs.
jbell
I agree with you that they don't appear to be required to ENT. I didn't read 300.4 last night, I just posted from memory and I thought they were required for ENT. I'll have to look back through some old code books to see if this changed but maybe they never were required and my memory is going. I don't use much ENT in metal stud work but can tell you from experience that it is almost impossible to pull it through punched holes without using plastic bushings because the groves catch on the studs.
dana1028
Senior Member
- Location
- San Francisco Bay area
Re: mc cable and plastic busings
What ruling could they give? There is nothing in 300.4(B)about MC... this section speaks specifically about NM and ENT... heck, it's entitled "NM & ENT through Metal Framing"...how much more clear can it be? If an inspector can't read, then he probably can't read the ruling either.
What ruling could they give? There is nothing in 300.4(B)about MC... this section speaks specifically about NM and ENT... heck, it's entitled "NM & ENT through Metal Framing"...how much more clear can it be? If an inspector can't read, then he probably can't read the ruling either.
- Location
- Bremerton, Washington
- Occupation
- Master Electrician
Re: mc cable and plastic busings
Dana, as section 330.17 (MC cable) refers you to 300.4, the rules of 300.4 apply to MC cable.
Dana, as section 330.17 (MC cable) refers you to 300.4, the rules of 300.4 apply to MC cable.
dana1028
Senior Member
- Location
- San Francisco Bay area
Re: mc cable and plastic busings
I don't dispute 300.4(A) applies - this is the generic part of 300.4...it pertains to all cabling/wiring that gets too close to a wood stud edge.
However when you arrive at 300.4(B) (Metal Framing)it specifically names those wiring methods addressed in that code section - NM & ENT.
A,B,C breaks up the code into different sections - I believe the NEC Code Style Manual (?) makes reference to the layout of the code. An exception in (B)(1) does not apply to (A)(1). The reason a new section (B) was created was to differentiate the applicable rules between different wiring situations.
I don't dispute 300.4(A) applies - this is the generic part of 300.4...it pertains to all cabling/wiring that gets too close to a wood stud edge.
However when you arrive at 300.4(B) (Metal Framing)it specifically names those wiring methods addressed in that code section - NM & ENT.
A,B,C breaks up the code into different sections - I believe the NEC Code Style Manual (?) makes reference to the layout of the code. An exception in (B)(1) does not apply to (A)(1). The reason a new section (B) was created was to differentiate the applicable rules between different wiring situations.
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