Code, Standards, and Practices 6

Question 1

ability to cut off first 1/2 cycle

Answer 1

Current limiting

Question 2

Interrupting rate

Answer 2

the highest current at rated voltage that a device is identified to interrupt

Question 3

arc reducing maintenance switch

Answer 3

allows a worker to set a circuit breaker trip unit to ‘no intentional delay’ to reduce the clearing time while the worker is working within an arc-flash boundary

Question 4

Fuse L

Answer 4

Large

Question 5

Fuse J

Answer 5

Junior or small

Question 6

Fuse H

Answer 6

10,000 A interrupting rate

Question 7

What is the purpus of a motor OCPD

Answer 7

Prevent short circuits and ground faults

Question 8

Motors are protected by OCPD and

Answer 8

Overloads

Question 9

What is single phasing

Answer 9

Loosing a any leg on a 3 phase system

Question 10

What is inrush current

Answer 10

Large amount of current drawn from motor upon start up

Question 11

Disconnecting switches have?

Answer 11

Ampere ratings

Question 12

How do overloads protect from to much inrush for to long

Answer 12

Thermal connection will liquify and loose connection

Question 13

430.6

Answer 13

Ampacity and motor rating determanation

Question 14

What temp rating are OCPD terminations rated for

Answer 14

75 degree

Question 15

for a single motor, conductors shall not have an ampacity less than_____ of full load current rating

Answer 15

125%

Question 16

T/F small conductor rule dose not apply to Motors

Answer 16

True. table 240.4(G)

Question 17

Where can you find short circuit current ratings in the code

Answer 17

110.10

Question 18

T/F do transformers have inrush current

Answer 18

True

Question 19

3 phase transformer current ratings

Answer 19

VA
(voltage x 1.73)

Question 20

Hazards associated with fault current

Answer 20

Shock, Projectiles, Fire

Question 21

Fully Rated systems

Answer 21

Circuit breakers are 100% rated for available fault current

Question 22

Selective coordination

Answer 22

695.3 (C) (3)

Question 23

Who can deem a selectively coordinated system

Answer 23

Engineer

Question 24

What breaker trips first on a selectively coordinated system

Answer 24

The breaker closest to the fualt