Ch 5 Conductor Identification, Switch Control of Lighting Circuits, Bonding/Grounding of Wiring Devices, and Induction Heating

How to reidentify conductor insulation

Plastic electrical tape, heat shrink tubing, permanent felt-tip marking pens, and fast-drying "touch-up" paint. It must encircle the insulation.

What AWG conductors are only used in push-in terminals?

12 AWG

Define multiwire branch circuit

A branch circuit consisting of two or more ungrounded conductors having a voltage between them, and a grounded conductor having equal voltage between it and each un- grounded conductor of the circuit and that is connected to the neutral or grounded conduc- tor of the system

4-wire NM cable with 2 ungrounded and 2 neutral wires is designed for what? What does this avoid?

It's designed for wiring two 120-volt branch circuits without using a common neutral. This avoids the requirement of install- ing a tie handle on the circuit breakers or installing a 2-pole circuit breaker.

A grounded conductor must have what color?

Must have an outer finish that is either continuous white or gray, or have an outer finish (not green) that has three continuous white stripes along the conductor's entire length

Tamper-resistant switches are required where?

Required in new installations in dwelling units. This literally covers all locations in a dwelling including living areas, garages, unfinished basements, and accessory buildings.

UL refers to toggle switches as

Snap switches

Neutral point

The common point on a wye-connection in a polyphase system or midpoint on a single-phase, 3-wire system, or midpoint of a single-phase portion of a 3-phase delta system, or a midpoint of a 3-wire, direct current system

Neutral conductor

The conductor connected to the neutral point of a system that is intended to carry current under normal conditions

What are the supply conductors?

The conductor that runs from the source to the switch. It might also be referred to as the feed, hot, hot leg, or supply leg.

What is the return conductors?

The conductor that runs from the switch back to the switched outlet. It might also be referred to as the switch leg or switched leg.

What are traveler conductors?

The conductors that connect between 3-way and 4-way switches.

What are the switch loop conductors?

The conductors that run between (to and from) a switched outlet and the switch controlling that outlet.

Color coding for NM cable 4-wire with 2 neutral wires

one black ("hot" phase conductor) one white with a black stripe (grounded "identi- fied" conductor) one red ("hot" phase conductor) one white with a red stripe ("hot" phase conductor) one bare, covered, or green-insulated (equip- ment grounding conductor)

Color coding for NM cable 2-wire

one black ("hot" phase conductor) one white (grounded "identified" conductor)one bare, covered, or green-insulated (equipment grounding conductor)

Color coding for NM cable 3-wire

one black ("hot" phase conductor) one white (grounded "identified" conductor)one red ("hot" phase conductor)one bare, covered, or green-insulated (equipment grounding conductor)

Color coding for NM cable 4-wire

one black ("hot" phase conductor) one white (grounded "identified" conductor)one red ("hot" phase conductor)one blue ("hot" phase conductor)one bare, covered, or green-insulated (equipment grounding conductor)

What AWG conductors are not permitted to be reidentified as an equipment grounding conductor or grounded conductor in a raceway?

6 AWG or smaller

An ungrounded or "hot" conductor must have what color?

Any color other than green, white, gray, or three continuous white stripes on other than green insulation

Color coding for ungrounded wires in a raceway

Color choice is unlimited except for: Green or green with yellow stripe (reserved for grounding) White or gray (reserved for neutral)

Why can't a white conductor be used as the return conductor from a switch, 200.7(C)(1)?

The white conductor is used as the supply so that a black, red, etc. color can be used as the return. That way, the electrician has a black and white wire to connect to the luminaire.

For NM cable 200.7(C)(1) permits the white or gray conductor to be used for single-pole, 3-way, or 4-way switch loops. It must be permanently reidentified, at its terminations and anywhere that it's visible. The reidentified conductor is to be the supply (feed, hot, hot leg, supply leg) to the switch but not the return (switch leg or switched leg).

True