Chapter 3, Problem 3R

### EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition
Simmons
ISBN: 9781337516549

Chapter
Section

### EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition
Simmons
ISBN: 9781337516549
Textbook Problem

# How is the rating of the branch-circuit protective device affected when the conductors used are of a larger size than called for by the Code? See NEC 210.3. __________

To determine

Explain the effect of rating of the branch circuit protective device when the conductors used are of a larger size.

Explanation

Discussion:

The NEC is the standard electrical code that is prepared by the National Electrical Code committee. The objective of code is to protect and safeguard the person and property from electrical hazards.

According to an article NEC 210.3, the branch circuits are rated by the overcurrent protection devices such as circuit breakers or fuses.

Example:

Consider the electric cloth dryer used in residence has a nameplate rating of 6000W.

Write an expression to find current through dryer circuit as follows:

I=PV (1)

Here,

P is the power in watts.

V is the voltage of two phase (240V).

Substitute 6000W for P, and 240V for V in equation (1) to find I

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