11.1 Utilization Equipment (Article 422)

Why Article 422 Drives Exam Appliance Questions

A utilization equipment item is any equipment that uses electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes — in practice, every household and commercial appliance from a range to a water heater. Article 422 organizes the rules for appliances: ratings, branch-circuit sizing, overcurrent protection, flexible cords, grounding, and disconnecting means. On the Virginia journeyman exam, appliance questions cluster around three failure points: (1) forgetting the 125% continuous-load factor on heating loads, (2) picking the wrong disconnect location, and (3) misapplying Table 220.55 demand factors (which are for service/feeder calcs, not the branch circuit).

Branch-Circuit Rating for Appliances — 422.10

NEC 422.10(A) says the branch-circuit rating for an individual appliance shall not be less than the marked rating on the appliance. Two cross-references shape the math:

• Motor-operated appliances are sized per 430.6(A) and 430.22 (125% of motor FLA).
• Continuous loads (heating appliances, water heaters, space heaters) must be rated not less than 125% of the marked ampere rating of the appliance per 210.19(A)(1).
• Household ranges and cooking appliances follow Table 220.55 and 210.19(A)(3) — but only for feeder/service calculations. The branch circuit itself is sized from the nameplate and the 40 A floor.

422.10(B) governs circuits feeding two or more loads: cord-and-plug equipment is limited to 80% of the circuit rating [210.23(A)(1)], and equipment fastened in place is limited to 50% when the circuit also supplies luminaires and receptacles [210.23(A)(2)].

Overcurrent Protection and Marking — 422.11

422.11 sets the maximum overcurrent protective device (OCPD) for appliances. The general rule: the OCPD shall not exceed the ampacity of the appliance conductors or the appliance marked rating. A key allowance is 422.11(E)(3) — for water heaters and similar resistive loads, the OCPD may be raised to 150% of the appliance rating when the 125% calculation does not land on a standard size. Example: a 4,500 W / 240 V water heater = 18.75 A × 125% = 23.44 A → next standard 25 A breaker; if nuisance tripping occurs, 422.11(E)(3) allows up to 150% (28.1 A) → 30 A breaker on 10 AWG conductors.

Flexible Cord Connections — 422.16

422.16 limits where and how a flexible cord may connect an appliance. Cord-connected appliances are permitted only for: (A) appliances specifically listed for cord connection, (B) portable appliances, or (C) where fastened-in-place equipment needs to be moved for maintenance (a range or dryer on a cord). The cord must be listed for the use (Type S, SJT, SE for ranges/dryers), not exceed the length marked on the listing, and may not pass through walls, floors, ceilings, or doors. A cord is never a substitute for fixed wiring and may not be used where the appliance is concealed.

Electric Ranges, Dryers, and Water Heaters

Fixed Electric Space Heating — Article 424

Article 424 treats fixed electric space heating (baseboard, wall, radiant) as a continuous load. Per 424.3(A), the branch-circuit conductors and OCPD shall be sized at not less than 125% of the heater's rated load. A 2,400 W / 240 V baseboard heater = 10 A × 125% = 12.5 A → 15 A circuit on 14 AWG, but no more than 80% of the circuit rating can be load (so a 15 A circuit maxes at 12 A load; the 2,400 W heater is right at the 80% mark on a 15 A circuit). 424.6 requires fixed heating equipment to be marked with voltage, wattage, and the minimum branch-circuit rating.

Appliance GFCI Protection

The 2020 NEC expanded GFCI for appliances. Key triggers on the exam:

• 210.8(A) and (B) require GFCI on 15 A and 20 A receptacles in kitchens, bathrooms, garages, basements, crawlspaces, and outdoors.
• 422.5(A) specifically requires GFCI for cord-and-plug-connected vending machines.
• 210.8(C) (2020 addition) extends GFCI to outdoor outlets ≤ 100 A.
• 210.8(F) (added 2020) requires GFCI protection on outdoor outlets rated 50 A or less.
• Bathroom and kitchen branch circuits feeding appliances must use GFCI-protected receptacles or breakers per 210.8, regardless of whether the appliance itself is hardwired.

Disconnecting Means — 422.30 through 422.35

422.30 is the umbrella rule: each appliance must have a means that simultaneously disconnects all ungrounded circuit conductors. The specific methods:

• 422.31(A) — appliances rated ≤ 300 VA or 1/8 HP: a circuit breaker within sight or lockable per 110.25.
• 422.31(B) — appliances rated > 300 VA: a switch or circuit breaker within sight or lockable.
• 422.33 — a cord-and-plug connection can serve as the disconnect.
• 422.34 — a unit switch with a marked OFF position can be the disconnect if a secondary disconnect is available per the occupancy (one-family = service disconnect; multifamily = on the same floor; etc.).
• 422.35 — the disconnecting means for cooking equipment may be on or adjacent to the appliance.

"Within sight" (Article 100) means visible and not more than 50 ft away. When a disconnect cannot be within sight, a lockable disconnect per 110.25 is the substitute — and lockability must remain whether or not the lock is installed.

Worked Example: Sizing a 9 kW Range Branch Circuit

A 9 kW / 240 V household range is the classic exam scenario.

1. Nameplate current: 9,000 W ÷ 240 V = 37.5 A.
2. Branch-circuit minimum: Per 422.10(A), circuit rating ≥ nameplate → 37.5 A. But 210.19(A)(3) raises the floor to 40 A for ranges 8.75 kW or larger.
3. Conductor: 8 AWG copper (50 A at 75 °C per Table 310.16) is the minimum for a 40 A circuit; many installers run 6 AWG Cu with a 50 A breaker.
4. OCPD: 40 A standard size from 240.6(A), or 50 A when 6 AWG is used.
5. Neutral: per 210.19(A)(2), the neutral may be 70% of the ungrounded conductor ampacity (8 AWG neutral on a 6 AWG ungrounded run is code-legal), but a 4-wire cable (2 hots, neutral, equipment grounding conductor) is required for new range/dryer installations per 250.138 and the 1996 NEC change that retired the frame-as-grounded-neutral scheme.
6. Demand factor: Table 220.55's 8 kW (Column C) figure applies only to the service/feeder calculation — it must not be used to pick the branch-circuit conductor or breaker.

Exam Traps

• Applying Table 220.55 (8 kW for ≤ 12 kW ranges) to the branch circuit instead of the feeder — wrong. The branch circuit follows 422.10(A) + 210.19(A)(3).
• Sizing a water heater breaker at 100% of nameplate — wrong; 422.13 requires 125%.
• Allowing a cord-and-plug disconnect for a hardwired disposal — wrong; 422.31(B) requires a switch or breaker within sight.
• Forgetting that fixed space heating is continuous at 125% — common miss.