Basics

Question 1

Describe the basic wire types used here.

Answer 1

Teck Cable (armoured).

Fiber cable.

Cab tire (or flexible cable).

Seal/liquid tight (armoured like teck but empty)

BX

Question 2

In a socket set, there are two sets of every size socket. Why?

Answer 2

One side is for the bigger socket. The other is for the smaller one.

Question 3

A half inch nut pertains to which diameter?

Answer 3

The internal.

Question 4

How do you open a cabinet that has its circuit breaker turned on?

Answer 4

By shifting the screw with a flathead left or right, while simultaneously pulling the door outwards (after loosening the door screws).

In the newer CB’s, the screw is small and below the handle. In the older ones, the screw is bigger and atop the handle.

Question 5

Does the control power of a bucket need the circuit breaker turned on?

Answer 5

Yes. In usual cases, the higher voltage line side goes through a control transformer, which then feeds the control circuit (as discussed in class).

Question 6

In a hand off auto switch, the “on” setting is what?

Answer 6

If in a HOA, it says on off auto, the on is the hand option.

Question 7

Where are the do not use tags? Not the verification, not the lockout tags.

Answer 7

They’re in the same box where the lockout and verification tags are.

Question 8

What is the new verification process?

Answer 8

A journeyman locks out what is requested by the foreman. The verification tag is placed upon the lockout. The journeyman uses his own lock.

The journeyman and foreman both then sign the logbook.

Question 9

What is harder to drill through? Stainless steel or aluminum?

Answer 9

Stainless.

Question 10

If trying to put a self tapping screw through a stainless steel backplane, should you use the “drill” mode on a drill or the “impact” mode?

Answer 10

Drill; the beginning of the tapper is technically like a drill bit.

Question 11

What tool acts as a very good ruler/measuring device?

Answer 11

A level. You can use it to draw a straight line in chunks from top to bottom.

Question 12

How to test a diode in either direction with a voltmeter?

Answer 12

The black lead pushes out electrons. The red lead pushes out holes. Test ohmic value in one direction, and then, switch the lead positions (ie if black was on side a of diode and red on side b, switch so red is now on side a and black on side b).

Question 13

For mounting dinrail on a black pane, what should you use for material?

Answer 13

Drilling and then tapping and using a bolt is best, but tech screws or tappers are also acceptable.

Question 14

If there are no hole slots uncovered in a din rail for fastening, what can you do?

Answer 14

Take out a terminal block or device, fasten behind the device or block, and reinstall the component taken out.

Question 15

Line side is left or top side of a contact set for sure. But the circuit breakers, how are they oriented?

Answer 15

Up to the installer. I install them so I can read amperage when tilting head to the right.

Question 16

Is it a big deal if panduit sizes are different in a cabinet?

Answer 16

No

Question 17

Are endplates very important?

Answer 17

Yes. Without end plates, metal is exposed in terminal blocks.

End stops don’t function that way. End stops just act as added reinforcing so things don’t drop vertically on dinrail, or they act as a division.

Question 18

Where are breakers installed in a circuit, if , for example, you have an incoming power supply to a PS transformer to a dc device?

Answer 18

They’re installed before every device. So they’d be before the original
Incoming feed, before the power supply transformer, and then before the dc device, downstream from the PS (ps here means the device which changes incoming ac to output dc).

Question 19

What connectors are used in seal tight?

Answer 19

The seal tight connectors which are either metallic, or non metallic and look like strain reliefs used for cab tire.

Question 20

In a cabinet, which colours, for single conductors, denote ac vs dc?

Answer 20

Red is usually ac. Blue is dc.

Question 21

If you have watts on a device and volts, how do you figure out amps?

Answer 21

You divide the watts by voltage.

Question 22

What is the maximum breaker size for #14 wire?

Answer 22

15A

Question 23

How to determine which size wire to use on a circuit, and which size breaker?

Answer 23

Add up the ampacities of the devices in the circuit. That will help determine the conductor size (via table 2 in code) and the circuit breaker size (find the correct table to use).

Commonly, the wire and cb is rated for 125% of the amps of the circuit.

Question 24

Which spray is used to lubrucate pull cords?

Answer 24

Loctite’s silver grade anti seize lubricant

Question 25

What is the interface on a vfd called?

Answer 25

The HIM

Question 26

How do you ensure good stranded connection under a screw?

Answer 26

By twisting wires by hand first

Question 27

What is electrical tape rated up to?

Answer 27

600 volts.

Question 28

How do you perform a crimp?

Answer 28

Select the right dye. Then, position it around what is to be crimped. Then, crimp down.

Note for grounds, may use c clamp, like we did when crimping to the rebar and fence.

Note: with the automatic crimper, if the right dye isn’t available, can go smaller, but not bigger, UNLESS you fold the wire over itself to make it bigger. If going smaller, can get one or two strands only if foreman allows.

Question 29

If the wires are connected red black blue In a cell, from which way are you looking?

Answer 29

From the front of the cell.

Question 30

What is the basic functioning of a solenoid?

Answer 30

A coil is energized, attracting or detracting the plunger, allowing or stopping the flow of pressure in the form of oil, gas, air, etc.

Question 31

What’s the basic functioning of a relay?

Answer 31

A coil is energized or de energized. When energized, the contacts on the relay switch their positions from closed to open or open to closed.

Question 32

What is the same as traverse?

Answer 32

Long travel

Question 33

What is a stake on?

Answer 33

Stak on is the name brand for those crimps for wires where the lug is a ring or similar structure.

Question 34

What’s a grounding bushing?

Answer 34

It has a terminal screw for the ground attached to it.

Question 35

An Ethernet cable has a cable with 4 pair, #24 gauge.

What would the right denomination for a cable with 4-4 pairs be?

Answer 35

4 x 4-pair #24