Intro to NEC & Other Important Intro Terms

How often does the NEC code change?

Every 3 years

What is the acceptable amount of voltage drop on a circuit?

5%

Branch Circuit

The circuit conductors between the final overcurrent protective device (OCPD) protecting the circuit and the outlets

How do you deal with overcurrent on a multi-wire branch circuit?

Either a 2 pull breaker or 2 single pull breakers with a handle tie

Feeder

All circuit conductors between the service equipment, the source of a separately derived system, or other power supply sources and the final branch circuit OCPD

Outlet

Point on the wiring system at which current is taken to supply utilization equipment

Does compliance with the Code always result in an electrical installation that is adequate, safe, and efficient? Why?

No. It is essentially free from hazard but not necessarily adequate, safe and efficient

Which chapters of the NEC cover general wiring requirements?

1-4

Overcurrent

Any current in excess of the rated current of equipment or the ampacity of a conductor. It may result from overload, short circuit, or ground fault

Overload

Operation of equipment in excess of normal, full-load rating, or of a conductor in excess of rated ampacity that, when it persists for a sufficient length of time, would cause damage or dangerous overheating

Where do you find definitions in the codebook?

Art 100

When the NEC states “in sight from”, this means _____.

Equipment must be visible and within 50ft

To find sample calculations in using the code, refer to which Annex?

Annex D