FAQ

Revision/New

220.53, 220.57

EVSE Demand Factor Calculations

Leviton Comment: This guides purpose is to simplify

and condense the NEC changes. In that spirit we have

merged Articles 220.53 and 220.57. This was done

because they both relate to load calculations for EVSE.

Placing both articles here in one passage hopefully

simpliﬁes understanding to readers.

Change Summary

• As electric vehicles increase in popularity, guidelines

for installing supply equipment is critical. The two

articles below address the topic.

220.53 Appliance Load — Dwelling Unit(s). Applying a

demand factor of 75 percent to the nameplate rating load of

four or more appliances rated 1⁄4 hp or greater, or 500 watts

or greater, that are fastened in place, and that are served by

the same feeder or service in a one-family, two-family, or

multifamily dwelling shall be permitted. This demand factor

shall not apply to the following:

(1) Household electric cooking equipment that is fastened

in place

(2) Clothes dryers

(3) Space heating equipment

(4) Air-conditioning equipment

(5) Electric vehicle supply equipment (EVSE)

220.57 Electric Vehicle Supply Equipment (EVSE) Load.

The EVSE load shall be calculated at either 7200 watts

(volt-amperes) or the nameplate rating of the equipment,

whichever is larger.

Leviton Comment: Since 220.57 above doesn’t

designate dwelling or non-dwelling, it would apply to

all locations.

Please also reference Articles 625 in this guide for