Journeyman Exam Essentials — Printable Flashcards

A No point along a wall in a dwelling can be more than 6 ft from a receptacle, and any wall space 2 ft or wider must have one -- so no point on the floor line is ever more than 6 ft from an outlet.

A No point along a countertop wall space can be more than 24 in. from a receptacle, and every countertop space 12 in. or wider needs one.

A A minimum of two 20A small-appliance circuits must serve kitchen, pantry, and dining area receptacles -- and those circuits can't feed anything else.

A Each 12 AWG conductor counts as 2.25 cu in. of box fill volume (14 AWG = 2.0 cu in., 10 AWG = 2.5 cu in.).

A Each yoke/strap (switch or receptacle) counts as two conductor volume allowances, based on the largest conductor connected to it.

A A minimum of 30 in. wide, 36 in. deep for 0-150V to ground (condition 1); depth increases to 42 in. or more at higher voltages or exposed live parts on both sides.

A Up to six disconnects grouped in one location are permitted to disconnect all ungrounded conductors from the service.

A A metal underground water pipe in direct contact with earth for 10 ft or more qualifies as a grounding electrode, but it can't be the sole electrode -- it must be supplemented.

A At least 20 ft of rebar (1/2 in.+) or bare copper conductor (4 AWG+) encased in at least 2 in. of concrete, near the bottom of a foundation footing in direct contact with earth.

A Sized from NEC Table 250.66, based on the size of the largest ungrounded service-entrance conductor (or equivalent area for parallel sets).

A Generally never on its own -- a switch or breaker must open all ungrounded conductors together with the neutral, not the neutral alone. This keeps the load from staying energized when the switch reads "off."

A At least one 20A branch circuit must supply bathroom receptacles, and it can serve only bathroom receptacles in one or more bathrooms (no lighting mixed in unless entirely within one bathroom).

A Ampacity must be adjusted per the NEC 310.15(C)(1) adjustment table -- e.g. 4-6 conductors are derated to 80% of the table ampacity.

A A 3-way switch has three terminals: one common and two travelers -- it has no "off" position by itself, only a choice of which traveler is connected to common.

A A main bonding jumper connects the grounded (neutral) conductor to the equipment grounding conductor and enclosure -- only at the service. An equipment bonding jumper connects EGCs together elsewhere, like at a subpanel or raceway.

A No side clearance is required if the equipment is not likely to require examination while energized -- but front working space per 110.26(A) still applies. Don't confuse "no side clearance needed" with "no front clearance needed."

A A wet location is subject to saturation with water (e.g. exterior, below grade); a damp location is subject to moderate moisture (e.g. under a roofed open porch); a dry location is normally not subject to either.