L1 - General Rules - Part 2

Question 1

Generally, is substitution of electrical equipment of a smaller size or rating allowed by the code, if the exact or larger size or rating is not available?

Answer 1

No, only with permission before commencing work.

Source: 2-108, 2-030, CEC, 2021 p73&74

Question 2

Should pyrotenax cable which has copper sheath be fastened with ordinary conduit or cable strap?

Answer 2

No, possibility of galvanic action

Source: 2-116(2), CEC, 2021 p75

Question 3

Is a person who has his own source of electrical energy required to obtain a current permit before connecting the installation, alteration or addition to the source although an electrical contractor has done the work?

Answer 3

Yes

Source: 2-016, CEC, 2021 p72

Question 4

What kind of enclosure would you choose for an installation in a car wash where the electrical equipment may be subjected to direct streams of water?

Answer 4

Table 65 Type 4

Source: 2-400(1)d, CEC, 2021 p79

Question 5

In hazardous locations where explosives or highly flammable materials or gases are present the code requires a special precaution when repairs or alterations are carried out. What is the precaution?

Answer 5

• Not to be made on live equipement
  2-302 and 18-010
• No repairs or alterations shall be carried out on any live equipment
  2-304(1)

Question 6

An installation is subject to drop of falling liquid due to severe condensation. This happens to be indoors. What type of enclosure would you choose?

Answer 6

Table 65 Type 2
2-400(1)b p79

Question 7

Can NMSC come in contact with metal-clad thermal insulation without violating the rules of this code?

Answer 7

Yes, NMSC may be in contact with the insulation

2-126(1)dii

Question 8

What does the code say about knob-and-tube wiring in conjunction with metal-clad thermal insulation?

Answer 8

25mm of separation shall be maintained

2-126(1)dii

Question 9

A 480V motor control centre has exposed live parts. The minimum working space required in front of the exposed live parts is

Answer 9

1m
2-308(4)

Question 10

What designation of enclosure is required for an indoor dry location where ordinary conditions exist

Answer 10

Type 1
2400(1)a

Question 11

What does the mark ‘T.E.’ Indicate on a motor nameplate?

Answer 11

Totally enclosed
2-404(1)c

Question 12

Can a 4-way switch be used as disconnecting means?

Answer 12

No
2-304(2)

Question 13

A switchboard with exposed live parts is used to supply a 12KV, 3-phase, 4-wire system. What is the minimum working space required for the switchboard?

Answer 13

Take as 12 000 volts to ground ?for year 1)
1,9m
Table 56, 2-308(3)

Question 14

Which rules is used to reject unapproved electrical equipment?

Answer 14

2-024
2-026
2-100(1)m

Question 15

In general, what is the maximum voltage to ground permitted for branch ccts in dwelling unit?

Answer 15

150V
2-110

Question 16

What is the minimum clearance required between an electrical meter and a natural gas meter? Both meters are installed outdoors.

Answer 16

1m
2-238 Appendix B p549

Question 17

A metal enclosed unit sub operating at 12.47/7.2 KV is installed in an electrical room. The path of travel to exit the room runs between the wall and the front of the unit sub. What is the minimum clearance required between the wall and the equipment?

Answer 17

1,5m
2-310(2)