Solid State Dimmer Question

[cobrahead]

520.25 Dimmers
(D) Solid-State-Type Dimmers. The circuit supplying a
solid-state dimmer shall not exceed 150 volts between conductors
unless the dimmer is listed specifically for higher
voltage operation. Where a grounded conductor supplies a
dimmer, it shall be common to the input and output circuits.
Dimmer chassis shall be connected to the equipment grounding
conductor.

I got a test question about this. Does it mean the grounded conductor should be considered a current carrying conductor?

 

[qcroanoke]

520.25 Dimmers
(D) Solid-State-Type Dimmers. The circuit supplying a
solid-state dimmer shall not exceed 150 volts between conductors
unless the dimmer is listed specifically for higher
voltage operation. Where a grounded conductor supplies a
dimmer, it shall be common to the input and output circuits.
Dimmer chassis shall be connected to the equipment grounding
conductor.

I got a test question about this. Does it mean the grounded conductor should be considered a current carrying conductor?

I would say it means the neutral used has to be the neutral for the ungrounded conductor that feeds the dimmer and lights.

 

[cobrahead]

I would say it means the neutral used has to be the neutral for the ungrounded conductor that feeds the dimmer and lights.

So it would be a non current carrying conductor.

 

[GoldDigger]

So it would be a non current carrying conductor.

If the only thing connected to it is the neutral lead from the dimmer, it will not be carrying enough current to be significant, but I do not think that the code would consider it non-current-carrying if there is also a hot lead in the box to which a device might some day be connected. If the neutral belongs to an MWBC and both hot leads are also in the box, then they would both be counted but the neutral would not.
On a switch leg, both the hot and the switched wire to the load are current carrying.
On a three-way traveller pair, only one is counted as a CCC since they cannot both carry current at the same time.

 

[qcroanoke]

.
On a three-way traveller pair, only one is counted as a CCC since they cannot both carry current at the same time.

That depends on who you ask.
search that topic. A lot of people say that both travelers count.
And the code does not say that they aren't, therefore they are........... ;o)

 

[Besoeker]

520.25 Dimmers
(D) Solid-State-Type Dimmers. The circuit supplying a
solid-state dimmer shall not exceed 150 volts between conductors
unless the dimmer is listed specifically for higher
voltage operation. Where a grounded conductor supplies a
dimmer, it shall be common to the input and output circuits.
Dimmer chassis shall be connected to the equipment grounding
conductor.

I got a test question about this. Does it mean the grounded conductor should be considered a current carrying conductor?

I'm not familiar with NEC code but I read that to mean the dimmer has to be in the live side and the neutral is uninterrupted and continues to the fixture to be dimmed.
Much like you'd put a simple switch in the live rather than the neutral.