Switchleg...CCC ?

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celtic

celtic

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NJ
I'm sure this has been asked before....my search was less than stellar :confused:


Assuming a conduit run with 3 ckts and shared neutrals....are the switchlegs considered CCC's?
[3 ckts, 3 switchlegs]

I should know this, but have some mental flatulence tonight.


TIA
 
celtic said:
I'm sure this has been asked before....my search was less than stellar :confused:


Assuming a conduit run with 3 ckts and shared neutrals....are the switchlegs considered CCC's?
[3 ckts, 3 switchlegs]

I should know this, but have some mental flatulence tonight.


TIA
Click to expand...

I don't know of any exception that would allow you to not counted the switch legs as CCC's.
 
celtic said:
I'm sure this has been asked before....my search was less than stellar :confused:


Assuming a conduit run with 3 ckts and shared neutrals....are the switchlegs considered CCC's?
[3 ckts, 3 switchlegs]

I should know this, but have some mental flatulence tonight.


TIA
Click to expand...
I would say yes being that they carry current. Somehow sometimes the code bunny doesnt count some and leaves a dollar under your pillow.
 
480sparky said:
I'd shoot 310.15(B)(2)(a) from the hip.
Click to expand...
Yes. And I could not find any exceptions.

310.15(B)(4) can make it worse if you have to count the neutral as well.

Add: It makes sense that only one wire would be carrying current at any given time, but the code does not recognize that. I wonder why?

Add 2: for a 3-way, that is.
 
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Now just a minute. I need some input.

I've never run across that problem before (getting to a derating point with a 3-way). Who gets to define a CCC: me or the inspector?

add: Just saw your post iwire. thanks.
 
Thanks for the replies guys
icon14.gif


I've got this spankin' new computer that I can't do a darn thing with....
old comp. crashed [HDD failure],
lost my estimating sheets/programs [to some degree],
have to load everything that was XP based onto Vista[if I can even find it and IF it will even load].....
total PITA.:mad:

Folks...back up your HDDs.
 
vinster888 said:
the neutral is carrying current also
Click to expand...

Are you meaning all neutrals when you make that statement?

There are only a few situations where would we need to count a neutral as a CCC

Roger
 
No, that would mean it is simply carrying the unbalanced current of the three ungrounded conductors and no additional current would be added for conduit fill.

For example, three ungrounded conductors in a conduit loaded to 20 amps each would create a true neutral, which would mean the neutral would be at zero amps and if all current flowing in the conduit was added together the total would be 60 amps

If you took the same three ungrounded conductors and loaded two of them to 20 amps and one to 10 amps the neutral would carry 10 amps and if all were added together you would have a total of 60 amps, the same as the scenario above.

If you used only two ungrounded conductors (in a wye connected configuration) and loaded them to 20 amps the neutral would also carry 20 amps and it would be counted as a CCC.

Roger
 
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vinster888 said:
the thread has three circuits with shared neutrals. unless all three circuits have the exact same load there will be current on that neutral. so that would make it CCC
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Yes the neutral would be carrying current, but it would not be a current carrying conductor for the purposes of conductor derating.
 
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