boris machado
Member
does the code prohibit to bundle up various mc cables together my inspector said induction creates heat that could damage de wires
MC CABLE
- Thread starter boris machado
- Start date
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boris machado
Member
Re: MC CABLE
could you explain how this is going to make a difference
thank you
could you explain how this is going to make a difference
thank you
curt swartz
Electrical Contractor - San Jose, CA
- Location
- San Jose, CA
- Occupation
- Electrical Contractor
Re: MC CABLE
310.15(B)(2) Adjustment Factors
(a) More Than Three Current-Carrying Conductors in a Raceway or Cable. Where the number of current-carrying conductors in a raceway or cable exceeds three, or where single conductors or multiconductor cables are stacked or bundled longer than 600 mm (24 in.) without maintaining spacing and are not installed in raceways, the allowable ampacity of each conductor shall be reduced as shown in Table 310.15(B)(2)(a). Each current-carrying conductor of a paralleled set of conductors shall be counted as a current-carrying conductor.
310.15(B)(2) Adjustment Factors
(a) More Than Three Current-Carrying Conductors in a Raceway or Cable. Where the number of current-carrying conductors in a raceway or cable exceeds three, or where single conductors or multiconductor cables are stacked or bundled longer than 600 mm (24 in.) without maintaining spacing and are not installed in raceways, the allowable ampacity of each conductor shall be reduced as shown in Table 310.15(B)(2)(a). Each current-carrying conductor of a paralleled set of conductors shall be counted as a current-carrying conductor.
jwelectric
Senior Member
- Location
- North Carolina
Re: MC CABLE
310.15 (B) (2)
Exception No. 5: Adjustment factors shall not apply to Type AC cable or to Type MC cable without an overall outer jacket under the following conditions:
(1) Each cable has not more than three current-carrying conductors.
(2) The conductors are 12 AWG copper.
(3) Not more than 20 current-carrying conductors are bundled, stacked, or supported on ?bridle rings.?
A 60 percent adjustment factor shall be applied where the current-carrying conductors in these cables that are stacked or bundled longer than 600 mm (24 in.) without maintaining spacing exceeds 20.
Always be sure to read the exceptions to a rule
310.15 (B) (2)
Exception No. 5: Adjustment factors shall not apply to Type AC cable or to Type MC cable without an overall outer jacket under the following conditions:
(1) Each cable has not more than three current-carrying conductors.
(2) The conductors are 12 AWG copper.
(3) Not more than 20 current-carrying conductors are bundled, stacked, or supported on ?bridle rings.?
A 60 percent adjustment factor shall be applied where the current-carrying conductors in these cables that are stacked or bundled longer than 600 mm (24 in.) without maintaining spacing exceeds 20.
Always be sure to read the exceptions to a rule
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Re: MC CABLE
JW is correct, the general rule of 310.15(B)(2) doesn't apply to bundled AC and MC cables, exception #5 does. If these bundles had #12 conductors and are protected at 15 amps you could have 100 cables bundled together.
JW is correct, the general rule of 310.15(B)(2) doesn't apply to bundled AC and MC cables, exception #5 does. If these bundles had #12 conductors and are protected at 15 amps you could have 100 cables bundled together.
ryan_618
Senior Member
- Location
- Salt Lake City, Utah
Re: MC CABLE
The exception that most people don't consider is this one, which often times nullifies the whole thing:
The exception that most people don't consider is this one, which often times nullifies the whole thing:
ryan_618
Senior Member
- Location
- Salt Lake City, Utah
Re: MC CABLE
Sam, what this is saying is that I could have a run of cables 100 feet long, with a 9' segment that is bundled together. You would not have to apply ampacity adjustments because of this exception.
Sam, what this is saying is that I could have a run of cables 100 feet long, with a 9' segment that is bundled together. You would not have to apply ampacity adjustments because of this exception.
boris machado
Member
Re: MC CABLE
thank you very much people for such explicit answers I've been in the trade for just a couple of years so i hope you understand my lack of knowledge in some of the issues that you discuss but thats why iam here to learn
thank you very much people for such explicit answers I've been in the trade for just a couple of years so i hope you understand my lack of knowledge in some of the issues that you discuss but thats why iam here to learn
boris machado
Member
Re: MC CABLE
so if I got my home runs going to the panels at a certain point let said 20 feet before they get in to the panel I can tie up all my MC cables together an i will be ok
so if I got my home runs going to the panels at a certain point let said 20 feet before they get in to the panel I can tie up all my MC cables together an i will be ok
marinesgt0411
Senior Member
- Location
- Naples,FL 34110-9285
Re: MC CABLE
What is 110 something a neat and workman type manner.bundle the mc up and shove it down the wall to the panel to me does not comply spread them out and run them neatly to the panel does. but it is behind the drywall and no one will ever see it. take a little pride in your work even if you are the only one that does see it you will feel better just knowing you did a good job.
What is 110 something a neat and workman type manner.bundle the mc up and shove it down the wall to the panel to me does not comply spread them out and run them neatly to the panel does. but it is behind the drywall and no one will ever see it. take a little pride in your work even if you are the only one that does see it you will feel better just knowing you did a good job.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Re: MC CABLE
I wouldn't say that bundling MC cable isn't in a workman like manner. In fact it's just the opposite. I've seen many jobs where the cable looks like spaghetti entering the panel. Those of us who take the time to carefully trim out the cables and dress them together are going the extra mile to perform in a workman like manner.
peter d
Senior Member
- Location
- New England
Re: MC CABLE
Bottom line, "neat and workmanlike" is so vague and subjective that it should be removed from the code.
Bottom line, "neat and workmanlike" is so vague and subjective that it should be removed from the code.
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Re: MC CABLE
In addition, like seatbelt and helmet laws, it should not even be needed.
volt101
Senior Member
- Location
- New Hampshire
Re: MC CABLE
Neat and workmanlike manner is just like saying beauty is in the eye of the beholder. What you may say is a beauty, others could say that her face could make a train take a dirt path!
However, the fpn gives a little help offering a document to view that helps in determining what a beauty is. Kind of like a Playboy for wires.
Neat and workmanlike manner is just like saying beauty is in the eye of the beholder. What you may say is a beauty, others could say that her face could make a train take a dirt path!
However, the fpn gives a little help offering a document to view that helps in determining what a beauty is. Kind of like a Playboy for wires.
sandsnow
Senior Member
- Location
- Southern California
Re: MC CABLE
If I have multiple HR's in seperate conduits that come to one large box, and then consolidate through a 8 foot long riser (say 2inch) down to a panelboard, I don't need to worry about derating in this conduit???
Wow, seems weird, almost heresy
Wow, this brings up a question.
If I have multiple HR's in seperate conduits that come to one large box, and then consolidate through a 8 foot long riser (say 2inch) down to a panelboard, I don't need to worry about derating in this conduit???
Wow, seems weird, almost heresy
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