Code Questions 4 th Year

Question 1

T or F The polarity mark of a CT must be on the load side of the installation.

Answer 1

Answer : True

Question 2

T or F A separate bonding conductor is not required with flexible metal conduit.

Answer 2

Answer: True

Question 3

T or F Cable tray systems have to be bonded at least every 20 meters.

Answer 3

Answer : False

Rule 12-2208 (1) 15 m

Question 4

High voltage, from the standpoint of the CEC, is voltage :

A.) over 600 V
B.) over 750 V
C.) between 2,400 and 69,000V
D.) over 1000 V

Answer 4

Answer: B over 750

Question 5

All medium-voltage cables above ___________ Volts are required to have insulation.

A.) 750
B.) 1000
C.) 2000
D.) 5000

Answer 5

Answer: D.5000V

Question 6

Insulation-level ratings on medium voltage cables are mainly classified as .

Answer 6

Answer: 100 and 133 %

Question 7

The most common form of relay protection is ?

Answer 7

Answer : overcurrent

Question 8

Which table in the CEC provides information on the rating of HV fuses for transformer?

Answer 8

Answer: Table 50

Question 9

Which table provides information as to the minimum spacing distances between HV fuses assembled in the field?

Answer 9

Answer : Table 35

Question 10

Under a fault condition, the maximum voltage rise on all parts of the station grid should not exceed .

Answer 10

Answer: 5000V

Question 11

What is the minimum vertical ground clearance for a 15KV open line conductors?

Answer 11

Answer: 61 m

Question 12

T or F Isolating Switch ok to use to interrupt current ?

Answer 12

Answer: False

Question 13

T or F can OL heaters be ahead of power contacts ?

Answer 13

Answer: False

Question 14

T or F light fixtures must have a bonded cover.

Answer 14

Answer: True 10-904 (6)

Question 15

T or F can 3 #3’s be protected by 125 A overcurrent device.

Answer 15

Answer: False 14-104 (a)

Question 16

Servicebox in a bus shelter. Gives some minimal lighting load of about 3-4 amps you need a minimum service conductor of?

Answer 16

Answer: #8 AL 6-302 (4)

Question 17

House Calc
46’x 38’ w full basement
12 kw Range , 6 Kw Dryer, 4.5 kw Hwtr, 6 kw sauna , 12A/120V oil furnace

Answer 17

Answer:
Calculated Service demand : 94.27 Amps

Min ampacity of service conductors 100 Amps
Min Main breaker Size : 100 Amps
Min Rw90 Aluminum Conductors #2 AL ( table 39 5% Rule)
Min Conduit size : 27 using table 10 A
Min circuit breaker spaces: 24

Question 18

You are changing a defective receptacle in a hospital where there is a brown conductor and an Orange conductor connected to the nickel-plated terminal. What do you do ?

Answer 18

Answer: Install new receptacle and reconnect the same way.

Question 19

A circuit contains only 240 V mogul base, incandescent lamps may have a max wattage of ?

Answer 19

Answer: (.8x40x240) = 7680 W

Question 20

Oil filled motor starters contain up to ________ L of oil in the group before having to be installed In a vault .

Answer 20

Answer: 138 L Rule : 26-012 (3)

Question 21

A 3 phase 200 KVA oil filled transformer rated 575/120/208

used for a lighting load . Secondary fused at 125% What is max overcurrent permitted on primary ?

Answer 21

Answer : 603 Amps

Question 22

A paint mixing room for auto body shop is classed as a .?

Answer 22

Answer : Class 1 ,ZoneII Rule : 20-302-3

Question 23

What are the max number of lighting branch circuits allowed before a distribution panel is required to be installed ?

Answer 23

Answer : 2 - single phase

3 - 3 phase Rule: 14-110