The EVSE can be subjected to the 75% demand factor provided the dwelling has at least four fixed in place appliances. This statement is:

The EVSE can be subjected to the 75% demand factor provided the dwelling has at least four fixed in place appliances. This statement is:

• A. True
• B. False
• C. Only if the dwelling has at least six fixed in place appliances
• D. Never

Answer: (B)

Understanding how demand factors work helps you see why this statement isn’t correct. Demand factors are used to reduce the apparent load of a dwelling by assuming not all appliances run at the same time. The EVSE (electric vehicle charging equipment) load is treated separately in the load calculation, and it isn’t simply eligible for a 75% reduction just because the dwelling has a certain number of fixed-in-place appliances. The rules for EVSE typically require using its full rated load (or the specific NEC provision for EV charging loads) when sizing conductors and service, rather than applying a blanket 75% factor based on the count of fixed appliances. So the idea that EVSE can automatically be reduced by 75% due to having four fixed appliances is not correct; EVSE load is not governed by that criterion in that way.

Understanding how demand factors work helps you see why this statement isn’t correct. Demand factors are used to reduce the apparent load of a dwelling by assuming not all appliances run at the same time. The EVSE (electric vehicle charging equipment) load is treated separately in the load calculation, and it isn’t simply eligible for a 75% reduction just because the dwelling has a certain number of fixed-in-place appliances. The rules for EVSE typically require using its full rated load (or the specific NEC provision for EV charging loads) when sizing conductors and service, rather than applying a blanket 75% factor based on the count of fixed appliances. So the idea that EVSE can automatically be reduced by 75% due to having four fixed appliances is not correct; EVSE load is not governed by that criterion in that way.