Branch Circuits

Question 1

Branch Circuit

Answer 1

Art. 100 Definitons
is the circuit conductors between the final overcorrect device (circuit breaker or fuse) protecting the circuit and the outlet(s)

Question 2

Rating of a Branch Circuit is determined by

Answer 2

Art 210 Branch Circutis
210.3 Rating.
Max ampere rating of the Overcorrect Device (OCPD, Circuit breaker or fuse) and NOT by the size of the conductors used for the branch-circuit)

Question 3

For other than individual Branch Circuits the ratings shall be

Answer 3

Art 210 Branch Circuits
210.3 Rating.
The rating for other than individual branch circuits shall be 15, 20, 30, 40, and 50.
FYI
where the length(say length and size, ie 12 awg is rated for 20 amps OCPD 20 amps) of the branch circuit conductors is determined to cause an unacceptable voltage drop, larger conductors with a higher ampacity are commonly used (10 awg rated for 30 amps in accordance to Tbl. 310.16, can be used to ratify the voltage drop under the 20 amp OCPD)

Question 4

The exception for branch circuits greater than 50 amperes shall be permitted to supply nonlighting outlet loads on industrial premises where conditions of, is as follows

Answer 4

Art 210 Branch Circuits
210.3 Rating.
Maintenance and supervision ensure qualified persons service the equipment.

Question 5

As per NYC 2011 code Amendment Branch Circuits shall be sized to allow a max Voltage Drop of __ percent at the last _____ supplying _____ or _____.

Answer 5

3%
outlet
lighting or power.

             Art 210 Branch Circuits (2011 Amendment) 210.19(A)(1) (2011 Amendment) 210.19 Conductors- Minimum Ampacity (A) Branch Circuits Not More than 600 volts (1) General

Question 6

As per NYC 2011 code Amendment combined feeder and Branch Circuits, Voltage drop shall not exceed __ %.

Answer 6

5%

Art 210 Branch Circuits (2011 Amendment)

Question 7

The Branch Circuit formula to determine the # of circuits allowed on a Branch is?

Answer 7

The number of circuits is equal to there Load VA (Watts)
divided (over) the circuit VA (watts), Mathematic formula

of circuits = Load VA / Circuit VA

Question 8

Examples of Continuous loads for commercial and industrial occupancies expected to be operated over 3 Hours are:

Answer 8

Lighting loads

Motors

Question 9

Examples of non-continious loads, for commercial, industrial and residential occupancies are:

Answer 9

General-purpose receptacle outlets

General- purpose lighting

Question 10

Single Receptacles installed on an individual Branch Circuit shall have an ampere rating not less than the _____ _______.

Answer 10

Branch Circuit.

                  Art 210 Branch Circuits 210.21(B)(1) 210.21 Outlet Devices. (B) Receptacles (1) Single Receptacles on an Individual Branch Circuit

Exception 1: Portable motors rate less than 1/3 Horsepower and supplied with an attachment plug (cord and plug) 430.81(B)
Exception 2: A receptacle installed exclusively for use of a cord and plug connected arc welder shall be permitted to have an ampere rating not less than the minimum branch circuit conductor ampacity determined by 630.11(A) for arc welders.