single phase three wire panelboards
single phase three wire panelboards
(OP)
I have four (4) individual 120/240V, single phase, three-wire rated panelboards. However, the power source is 208/120, 3-phase, 4-wire. My loads require either 120V or are air conditioning units that are rated for both 208 and 240V. I think that I should be able to connect each of the above panels using 2-phase, 3-wire 208/120V (i.e. one wire from each of 2 phases and one neutral, giving 208V phase to phase and 120V phase to neutral). I would attempt to balance the loading on the transformer by connecting one panel phase A, phase B, neutral, and the next phase B, phase C, neutral, etc.
Am I on the right track here? Am I violating any codes?
Am I on the right track here? Am I violating any codes?






RE: single phase three wire panelboards
2.) Maby -Make sure there labeled correctly when installed. The difference in connecting something at 208 vs 240 is significant for some loads. Ten years from now someone needs to know. Vendors will label your panels 208/120 if you specify it to be so.
RE: single phase three wire panelboards
RE: single phase three wire panelboards
An alternate practice was to install a separate 3-phase house service and then put in 1, 2, or 3 single phase services for the tenants so that cheaper form 2s meters could be used for the tenants. All depended on who your electrical utility was.
RE: single phase three wire panelboards
Just remember that if you make this installation, that the grounded or neutral conductor is always a current carrying conductor for the purposes of applying the derating that is required for more than 3 conductors in a raceway or cable. 310.15(B)(4)(b)
Don
RE: single phase three wire panelboards
"Venditori de oleum-vipera non vigere excordis populi"
RE: single phase three wire panelboards
RE: single phase three wire panelboards
bxny