210.19(A)(1) Informational note no 4

[mwburnett]

I design industrial machinery, not outlets, but I was wondering if when I size a voltage drop could a JHA apply this rule to my machine ?

Example: I need 460 VAC 3P at 40 amps 1200 feet from the source. I would step the voltage to 560 VAC 3P and have 480 VAC 3P at 1200 feet. (Yes I would increase the Amperage to account for the loss in the step-up transformer and yes I would be sizing the step-up transformer supply wire at 4 AWG probably)

That is way more than the not to exceed 5%.

Thanks in advance

Mark Burnett

 

[roger]

I design industrial machinery, not outlets, but I was wondering if when I size a voltage drop could a JHA apply this rule to my machine ?

Example: I need 460 VAC 3P at 40 amps 1200 feet from the source. I would step the voltage to 560 VAC 3P and have 480 VAC 3P at 1200 feet. (Yes I would increase the Amperage to account for the loss in the step-up transformer and yes I would be sizing the step-up transformer supply wire at 4 AWG probably)

That is way more than the not to exceed 5%.

Thanks in advance

Mark Burnett

The wiring outside of your machine would be under the AHJ however, IN's are not code rules and the VD mentioned is only a recomendation.

Roger

 

[mwm1752]

Are you stepping up the voltage to accomodate the breaker sizing or actual load of the machinery.. does not VD occur only with a load draw? Do you adjust voltage when a more effecient machine is replacing an old. Is the machine designed to run at 460v or 480v? Could not see this applicable to a panel feeder.