Protectors of Conductors (From Mechanical Damage)

Question 1

Two types of conduit (flex)

Answer 1

green field (hollow)
BX (Pre-wired)

Question 2

If you cut the end of conduit what must be done?

Answer 2

an anti-short bushing (red head) must cover the cut end

Question 3

Conduit must be supported at least every __ ft

Answer 3

At least every 4 1/2 ft

Question 4

Conduit must be supported at least __ inches within a box

Answer 4

12 inches

Question 5

How many feet of conduit can be unsupported leading to rotating machinery

Answer 5

3 ft

Question 6

EMT

Answer 6

Electrical metallic tubing

Question 7

All ends of EMT must be ____

Answer 7

Cut square and reamed

Question 8

EMT must be supported at least within every __ft

Answer 8

10 ft

Question 9

EMT must be supported within __ ft of a box

Answer 9

3 ft

Question 10

Max bends between a box and pull fittings

Answer 10

360°

Question 11

Electrical boxes are also referred to as what?

Answer 11

Junction boxes

Question 12

Junction boxes must always be what?

Answer 12

Covered and supported

Question 13

What must you do to knock out holes in the electrical box

Answer 13

Must block with knockout covers

Question 14

Maximum over current protection for 14 g wire

Answer 14

15 Amps

Question 15

Maximum over current protection for 12 g wire

Answer 15

20 Amps

Question 16

where must a switch be placed in a circuit

Answer 16

on the hot leg not on the return

Question 17

what are OHMS?

Answer 17

measurement of resistance to flow

Question 18

when a switch is closed what will the ohms meter read

Answer 18

0 Ω

Question 19

if a switch is open what will the ohms read

Answer 19

∞ Ω or OL

Question 20

to check voltage you must

Answer 20

connect to the line and neutral and if all is good next connect to the load and neutral

Question 21

you must always have a __ in a circuit

Answer 21

fuse or circuit breaker

Question 22

Oiler Burners Have a _________ switch in case of emergencies

Answer 22

emergency

Question 23

what are the rules for emergency switches

Answer 23

must be the highest switch 
must not be any higher than the first floor
in plain sight and clearly marked
markings must correlate with switch
cannot be in the same room as the boiler

Question 24

rules for thermal switches

Answer 24

must be placed directly above the burner
no higher than 6ft above the boiler
open at 165° f

Question 25

when turning on the service switch a ST must do what

Answer 25

keep hand on the service switch and stand off to the side

Question 26

Type of insulation used for (HVAC) wiring

Answer 26

THHN