Level 1 Electrical Apprenticeship: Voltage Classifications and NMSC

Review flashcards on Canadian Electrical Code (CEC) voltage classifications, extra-low voltage circuit examples, and Non-Metallic Sheathed Cable (NMSC) standards.

Low Voltage (CEC Definition)

Any voltage value classified by the Canadian Electrical Code (CEC) ranging from $31\,\text{V}$ to $750\,\text{V}$ inclusive.

Extra-Low Voltage Control Circuits

Control circuit installations operating at extra-low voltage, commonly exemplified by doorbells and thermostats.

Shielded Conductors

Specialized conductors typically utilized in extra-low voltage communication and signal circuits to prevent interference.

NMSC (Building Construction Usage)

Non-Metallic Sheathed Cable, a wiring method almost always utilized in combustible and wood-frame building construction.

NMSC Voltage Rating

The maximum allowable voltage rating for Non-Metallic Sheathed Cable, which is $300\,\text{V}$.

"90" in Type NMD-90

Designation indicating the maximum conductor temperature rating of $90^\circ\,\text{degrees}$ ($90^\circ\,\text{C}$).

Bare Wire in NMSC

The uninsulated wire within Non-Metallic Sheathed Cable whose primary purpose is grounding.

Low Voltage (CEC Classification)

Any voltage value from $31\,\text{V}$ to $750\,\text{V}$ ($1000\,\text{V}$) inclusive, as classified under the Canadian Electrical Code (CEC).

Extra-Low Voltage Control Circuits

Control circuits operating at extra-low voltage levels, commonly used in applications such as a doorbell and a thermostat.

Communication and Signal Circuits

Circuits that are generally classified as extra-low voltage and typically utilize special shielded conductors.

NMSC Construction Applications

Building construction types where Non-Metallic Sheathed Cable (NMSC) is almost always used, specifically combustible and wood-frame construction.

NMSC Maximum Voltage Rating

The maximum operational voltage rating designated for Non-Metallic Sheathed Cable (NMSC), which is $300\,\text{V}$.

Type NMD-90

A type of non-metallic sheathed cable where the numeral 90 specifies a maximum conductor temperature rating of $90^\circ\text{ degrees}$.

Bare Wire in NMSC

The bare, uninsulated conductor present inside Non-Metallic Sheathed Cable (NMSC) that serves as the equipment ground.