Mike Dolt Enterprises
Mike Dolt Enterprises
User: pipe_bender, Location: Boston
Asked on: Monday, June 23, 2025 at 10:36 pm EDT
Answered on: Monday, June 23, 2025 at 10:43 pm EDT
Question: 2023 NEC Quiz question:A garbage disposal is to be wired with a nameplate that says 9.5 A , 3/4 HP, 120 volts.What is the calculated load of this disposal on a branch circuit with two or more loads according to article 210?A) 1656 VAB) 1140 VAC) None of the aboveWhat is the calculated load for the disposal on a individual circuit according to 422.10?A) 1656 VAB) 1140 VAC) None of the above
Here's the breakdown of the calculations and the correct answers
Part 1: Branch Circuit with Two or More Loads (Article 210)
Article 210.23(A) (Permissible Loads, Multiple-Outlet Branch Circuits)
This section specifies that the load shall not exceed 80% of the branch circuit rating.
Calculate VA
We start with the nameplate amperage (9.5 A) and voltage (120 V): VA = Amps x Volts = 9.5 A x 120 V = 1140 VASince this circuit is for two or more loads we must derate for what the load is actually calculated at
Answer for Part 1: B) 1140 VAPart 2: Individual Circuit (Article 422) Article 422.10 (Individual Circuits)
Electric appliances or equipment permitted by 422.10(A) through (D) shall be permitted to be supplied by an individual branch circuit.
Article 422.10(A) (One or More Appliances)
this section does not mention anything about the nameplate ratings must be increased by any calculation.For individual circuits we may use the nameplate ratings to calculate
Calculate VA
We start with the nameplate amperage (9.5 A) and voltage (120 V): VA = Amps x Volts = 9.5 A x 120 V = 1140 VA
Article 430 (Motors, Motor Circuits, and Controllers) is not applicable because the nameplate already has the amperage listed.
Answer for Part 2: B) 1140 VA Flag for review