3.10 Device and Equipment Requirements

Requirements For Switches and Receptacles

• Switches must be selected to match the load they control.

• A panelboard-like enclosure called lighting control panel is used in large lighting installations that require many switches.

• Receptacles must be selected to match the appliance or equipment they serve.

• Ordinary convenience receptacles and switches are general wall mounted and there are no specific height requirements for switches and receptacles.

Requirements For Switches and Receptacles

• Normally, switches are mounted approximately

  48 in. (1.2 m) above finished floor (AFF), convenience receptacles at 16 in. (400 mm) AFF and convenience receptacles in bathrooms and restrooms at 44 in. (1.1 m) AFF, unless otherwise specified.

• Receptacles are customarily installed with the grounding slot oriented downward.

• Unless the receptacle is controlled by a switch, the receptacle is frequently aligned with the grounding slot upward.

• In contrast to historical practice, it is recommended that receptacles be installed with the grounding slot oriented upward to improve safety.

One requirement for switches and receptacles is the ____ ___ would be the first blade to contact the object, which would not create a short-circuit by orienting the grounding slot upward.

An overcurrent protection (OCP) device, a fuse, or circuit breaker serves to limit voltage levels in a conductor by interrupting power when current limitations are exceeded. It prevents excessive heat from damaging conductors and related equipment

• false

• true

Answer explanation

limit CURRENT levels, not voltage

The _____ rating of a fuse or circuit breaker must be equal to or greater than the voltage of the circuit in which the fuse is applied.

The ___ carried by the electrical circuit or system protected by an OCP device must not exceed the maximum current rating of the circuit breaker.

• current (amperage)

• resistance

• voltage

• impedance

the amperes interruption current (AIC)

rating for circuit breakers should be at least _____.

the amperes interruption current (AIC)

rating for fuses should be at least ____.

The fuse or circuit breaker must be installed at a location in the circuit where the resistors receive power (generally at the panelboard).

• false

• true

Answer explanation

conductors receive power, not resistors

The transformer must protect the ungrounded conductors in a circuit to ensure that power to the circuit Is interrupted by the transformer

• false

• true

Answer explanation

OCP device not transformer