sizing neutral for commercial kitchen 240v loads

[jagahen]

I know that you are allowed to calculate the neutral load for household cooking equipment (and dryers) using 70% (of the ungrounded load).
Does that mean that commercial cooking equipment(240v) is figured at 100% of the ungrounded for the neutral.
This would be for service calculations.
I've had people tell me that there is no neutral load for commercial cooking equipment (240v) and I tend to agree, but if that's the case then why the load for household calculations?

 

[ericsherman37]

220.61 (B) allows for the 70% neutral reduction in household cooking stuff and dryers, like you said.

If an appliance anywhere, dwelling or commercial kitchen or whatever, doesn't have a neutral at all - like straight 240V stuff - then there is of course no neutral to reduce for that load.

If it does have a neutral, like, say, a 240/120V commercial toaster oven, then the 70% reduction still does not apply. However, if you have three or more pieces of non-dwelling unit kitchen equipment on a service, you can apply demand factors per Table 220.56, which would reduce your ungrounded conductor load and therefore any corresponding neutral loads as well.

But otherwise, the 70% neutral reduction doesn't apply to commercial stuff.

 

[ericsherman37]

And the presence or absence of a neutral load is not related to the type of occupancy in which the equipment is installed. I've seen all sorts of various 240/120 or 208/120 commercial cooking stuff. Sometimes the big load of an appliance (heating elements or motors) utilizes the higher voltage and the neutral is there to just run some electronic controls or something.

So I hope that whoever told you that commercial cooking equipment doesn't have a neutral has begun looking at appliance nameplates to be sure