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Flashcard · Electrical Services, Service Equipment, and Separately Derived Systems

Load calculation article in the 2026 NEC?

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Load calculation article in the 2026 NEC?: Article 120 (it was Article 220 in earlier editions; check your 2026 index). The standard method for feeders and services is Part III.NEC 2026 Article 120
Dwelling small-appliance and laundry loads in the standard method?: 1,500 VA for each small-appliance circuit (at least two) and 1,500 VA for the laundry circuit.NEC 2026 Article 120, Part III
Four or more fastened-in-place dwelling appliances?: Take 75% of their combined nameplate load (ranges, dryers, space heating and AC are figured separately).NEC 2026 Article 120, Part III (fastened-in-place appliances)
Dwelling service conductors at 120/240 V single-phase carrying the whole load?: Ampacity at least 83% of the service rating. Example: 200 A x 0.83 = 166 A.NEC 2026 310.12
Minimum service disconnect rating for a one-family dwelling?: 100 A, 3-wire.NEC 2026 230.79(C)
Clearances for overhead service conductors?: 230.24: above roofs, and vertical clearance above grade by what is underneath (walkways, residential driveways, streets).NEC 2026 230.24
Grounding electrode conductor size?: Table 250.66, read from the largest ungrounded service-entrance conductor (or the equivalent area of parallel sets).NEC 2026 250.66; Table 250.66
GEC that connects only to ground rods?: Not required to be larger than 6 AWG copper.NEC 2026 250.66(A)
GEC that connects only to a concrete-encased electrode?: Not required to be larger than 4 AWG copper.NEC 2026 250.66(B)
Main bonding jumper and supply-side bonding jumper size?: Table 250.102(C)(1), read from the size of the service conductors.NEC 2026 250.28; Table 250.102(C)(1)
When does a single ground rod need a supplemental electrode?: Always, unless that one rod measures 25 ohms or less to earth. Two rods are at least 6 ft apart.NEC 2026 250.53(A)
When is a metal underground water pipe a grounding electrode?: When at least 10 ft is in direct contact with the earth. It always needs a supplemental electrode.NEC 2026 250.52(A)(1); 250.53(D)