What does not happen... the inspector never disagrees? :huh:
Multiwire Branch Circuit and wire sizing
- Thread starter kbruin
- Start date
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Based on spec sheet:
If PF were .80 and THD were < 35% would device be still considered linear???
Are there specified ranges or is it left up to the individual to declare what is linear??
-Power Factor: PF>0.98/115VAC at full load
-Total Harmonic distortion: THD<20% when output loading >= 50% at 115VAC/230VAC input and output loading >=75% at 277% input (I will be running at 115VAC)
-Total Harmonic distortion: THD<20% when output loading >= 50% at 115VAC/230VAC input and output loading >=75% at 277% input (I will be running at 115VAC)
If PF were .80 and THD were < 35% would device be still considered linear???
Are there specified ranges or is it left up to the individual to declare what is linear??
electricguy61
Senior Member
Just curious: is this device some sort of a plant grow system?
- Location
- Massachusetts
I have never seen an inspector question derating of small conductors in general never mind specifically the issue of linear vs non-linear loads.
I find derating of small conductors virtually ignored here by almost all contractors and inspectors here in MA, RI and judging by the hot conduits I touched in upstate NY ignored there as well. Those that think about it use 10 AWG but without doing any calculations.
Looks like it happens in NJ and CO, too! :happyyes:
Probably happens a lot of other places, too.
kbruin
Member
- Location
- Denver, CO, USA
I too would love to know if there is a method of determining/assessing linearity. At least if I were to be asked by the AHJ (I agree this is very unlikely) I could have an answer ready, which again would probably be enough for them to move on.
At this point I feel good with the 12 wires (9 CCC) being acceptable at #12 AWG in a single conduit given this use. I appreciate the thoughts everyone's contributed up to this point.
At this point I feel good with the 12 wires (9 CCC) being acceptable at #12 AWG in a single conduit given this use. I appreciate the thoughts everyone's contributed up to this point.
Sounds like you are in good shape. The linearity question is qualitative and obviously not addressed by NEC. Thank you for posting your final decision and do let us know how job and inspection goes.
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