FAQ
43
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
more on EVSE.
Expert Analysis
A revision has been made to clarify that electric vehicle
supply equipment (EVSE) shall not be included in the
fixed appliance load when performing calculations
for the appliance load in a one-family, two-family, or
multifamily dwelling.
Material taken from the National Electric Code
®
is reprinted with permission
from NFPA 70
®
, 2023 edition. National Electrical Code
®
, Copyright 2022,
National Fire Protection Association, Quincy, MA. All rights reserved.
NEC
®
Text
continued on page 44