3 ccc in a raceway

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Smart $

Smart $

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mstrlucky74 said:
If you have 3 hots & a neutral is that 4ccc or 3ccc in the raceway? Thanks
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Assuming first off it's 3 phase, 4-wire wye system, it could be either. If majority of loads are linear, its 3. If majority is non-linear, then its 4.

Essentially, non-linear means electronic power supplies are involved, such as electronic ballasts, VFD's etc.
 
F

fmtjfw

Senior Member
Location
Fairmont, WV, USA
2014 new rule

2014 new rule

Or three if two of the "CCC" are travelers for a 3/4 way switching circuit -- 1 of the travelers, the other non-grounded wire, and the neutral.

Or two if all three of the "CCC" are outputs from a 3-throw 1-pole switch -- 1 of the three and the neutral.

2014 Table 310.15(B)(3)(a) note 1:

1Number of conductors is the total number of conductors in the raceway
or cable, including spare conductors. The count shall be adjusted
in accordance with 310.15(B)(5) and (6). The count shall not include
conductors that are connected to electrical components but that cannot
be simultaneously energized.
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fmtjfw

Senior Member
Location
Fairmont, WV, USA
No mention of shared neutral in the OP.
No mention of Branch Circuits in the OP.
Shared neutrals are allowed in feeders.

Let's think about the possibilities:

3-phase Wye with linear loads -- 3 CCC (hot wires only)
3-phase Wye with non-linear loads -- 4 CCC (all wires)
3-phase center-grounded Delta with linear loads -- 3 CCC (hot wires only)
3-phase center-grounded Delta with non-linear loads -- 4 CCC (all wires)
3-phase corner-grounded Delta, and 1 phase feeders -- 4 CCC (all wires)
1-phase two circuits 120V and 240V -- 4 CCC(two 240V hot, one 120 hot & one 120V neutral)
3 1-phase 120V feeders with super neutral -- 4 CCC (three 120V hot & one 120V neutral)
2 travelers, 1 power feed, and neutral -- 3 CCC (feed, 1 traveler, and neutral)
1 three position circuit and neutral -- 2 CCC (one of 3 possible wires and neutral)
 
infinity

infinity

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Journeyman Electrician
This may help, I wrote this a few years ago:



Neutral Conductors:
Here's some examples of when to count and not count the neutral as a current carrying conductor or CCC:

3?- 208Y/120 or 480Y/277 volt system-different circuit types:
A) 2 wire circuit w/ 1 ungrounded, 1 neutral = 2 CCC's
B) 3 wire circuit w/ 2 ungrounded, 1 neutral = 3 CCC's
C) 4 wire circuit w/ 3 ungrounded, 1 neutral = 3 CCC's*

Notes:
A) A normal 2 wire circuit has equal current flowing in each of the circuit conductors so they both count as CCC's.
B) In this circuit the neutral current will be nearly equal to the current in the ungrounded conductors so the neutral counts as a CCC
C) In this circuit the neutral will only carry the imbalance of the current between the three ungrounded conductors so it is not counted as a CCC, with an exception, *if the current is more than 50% nonlinear (see below for NEC article 100 definition) then the neutral would count as a CCC.

1?- 120/240 volt system-different circuit types:
D) 2 wire circuit w/ 1 ungrounded, 1 neutral = 2 CCC's
E) 3 wire circuit w/ 2 ungrounded, 1 neutral = 2 CCC's
Notes:
D) A normal 2 wire circuit has equal current flowing in each of the circuit conductors so they both count as CCC's.
E) In this circuit the neutral will only carry the imbalance between the two ungrounded conductors so the neutral is not counted as a CCC.
Nonlinear Load. A load where the wave shape of the steady-state current does not follow the wave shape of the applied voltage.
Informational Note: Electronic equipment, electronic/electric-discharge lighting, adjustable-speed drive systems, and similar equipment may be nonlinear loads.
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Ponchik

Ponchik

Senior Member
Location
CA
Occupation
Electronologist
OP where are you?

Please clarify what your question was.

We are going nuts trying to figure out what you meant. :)
 
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