Instalations

Question 1

When installing cable tray, what do you need, if a beam clamp is attached above?

Answer 1

Ready rod to thread into beam clamp, a nut, then a square washer (washers above the square washer are optional), and then, below the strut, another square washer, a circle washer, a lock washer, and another nut.

Question 2

Do you need a spring nut for installing cable tray?

Answer 2

Yes. But only for clamping.

Question 3

What is needed to clamp down cable tray?

Answer 3

A spring nut inside the strut, and a bolt and square washer over the inside lip of the cable tray.

Question 4

Which way does the strut lie in cable tray?

Answer 4

The open side faces up to

Question 5

If there is no non cut end of the cable tray piece to connect to, a joiner plate is made. How is it used?

Answer 5

Make a line at half on the joiner plate. Then knock out to bolts. Then place the joiner plate onto the cable tray, using the open holes as markings for where to drill on the cable tray piece that has a cut end.

Question 6

Is the joiner plate flush to top or bottom?

Answer 6

Top.

Question 7

If making an offset in ready rod…

Answer 7

Use a bender and judgement.

Question 8

If have two pieces of ready rod, how do you combine them?

Answer 8

Via a joiner.

Question 9

If you have two different sizes of cable tray, how do you combine them?

Answer 9

Via a reducer.

Question 10

Apart from beam clamps, what are two other ways to mount strut?

Answer 10

Against the wall via a hole done via a hammer drill, a bolt inserted via a wedge anchor or sleeve, An L bracket, and then the top side of the L bracket has two spring nuts and two bolts and two square washers. One spring nut is inserted into the strut, and a square washer and a bolt is then put in.

In q decking, can screw in a q deck ready rod insert.

Question 11

Cable trays vary in width. They may also vary in…

Answer 11

Height. Or profile.

Question 12

For an L bracket, what kind of anchors are used?

Answer 12

Wedge anchors.

Question 13

How do wedge anchors work?

Answer 13

A hammer drill is used to make a hole. The wedge anchor is then hammered into the hole (put a nut at hammering point to avoid damage to threads). The nut is then tightened.

Question 14

How do drop ins work?

Answer 14

A hole is made that matches the length of the drop in. A pin setter is used to hammer in the drop in until it bottoms out. A bolt is then inserted into the drop in.

Question 15

Out of wedge anchors and drop ins, which are better suited to hollow walls?

Answer 15

Wedge anchors.

Question 16

What’s another word for wedge anchor?

Answer 16

Quick bolts.

Question 17

If a nut is hard to reach in a cable tray, the first tool you should aim To use is…

Answer 17

A socket wrench. And then maybe a crescent wrench after the socket fails. (Assuming nut driver wont fit in this scenario)

Question 18

How is a cable tray clamped down?

Answer 18

To clamp, put a spring nut into the strut holding the tray. Then, get a bolt, a lock washer, and a square washer, and tighten the square washer onto the lip of the tray.

Materials: spring nuts, square washers, lock washers, bolt.

Question 19

In cable tray, which way do the joiner bolts face?

Answer 19

Outside.

Question 20

On which side is the line side in a cabinet?

What about the load side?

Answer 20

The line side is on the left or the top.

The load side is the right or the bottom.

Question 21

Describe how to mount terminal blocks in an empty cabinet.

Answer 21

Firstly, line up the dinrail on the backplane that is given (measure it to be centre). Then, use wafer screws to screw the din rail into the backplane using the slots in the dinrail.

Then, install the backplane using the screws given.

Then, install terminal blocks on it.

To install panduit, measure the location, leaving space for wires to curl into the terminal blocks on the dinrail as well as then, use wafer screws in the holes in the panduit to mount. (Note you’re allowed to knock out the slots of the panduit).

Question 22

When tightening down a flat washer using a bolt that comes out the other end onto a hinged clamp on unistrut, if the washer moves so it’s not flush when you’re tightening, what is a method to solve this issue?

Answer 22

Tighten a bit in the front, holding the back nut. Then, switch, and tighten nut in the back side.

Question 23

In a cabinet, if you have a JB with power, how do you get single conductors to the panduit to supply power to the PS from the jb?

Answer 23

You can:

1) use seal tight , leaving the open end with just the metal bushing that comes in the connectors on it (downside is coal can get into it if it’s facing up)

2) you can use a chase nipple and just let single conductors free air it to the panduit if it’s close enough (6” or so?)

3) you can use cab tire with a strain relief connector at the jb and nothing on the other end, simply stripping the jacket off at a point where it enters the panduit, down the entire length that’s needed for the conductors to reach their termination points.

Question 24

If red is ac and blue is dc in a cabinet, and you have a blue neutral incoming, how is it identified?

Answer 24

Via white tape. Try and always identify the blue as a neautral with tape (unnecessary with awg 4 or less though)

Question 25

What are the methods of knocking out holes in a panel.

Answer 25

You can use a knockout set (drill a pilot hole, then a bigger one, and then a knockout set).

You can also use a hole saw bit kit. Firstly drill a pilot hole. Then, use the kit, and attach the drill bit in the kit to the drill. Then pick the right size of hole saw bit, and slide that onto drill bit and go.

Question 26

When using big teck cable, what’s a way to measure out or determine where to bend the teck to put it into a connector?

Answer 26

Use spare sheathing (armour), lay it out from the connector to where the teck currently is abouts, and lay out the rest of the teck along the sheathing. Where the sheathing bends is where the teck bends. And where the sheathing ends at connector is where on the teck it will end.

Question 27

When taking out panduit tabs, what’s a way to not leave sharp edges?

Answer 27

Take out a panduit tab by bending vertically. Then, use side cutters to cut the base tab (the little outlying strip of panduit that the tabs are attached to) on either side. Then, use pliers and twist it off.

Question 28

How much hot to leave in a panel?
How much neutral?
How much ground?

Answer 28

Enough to reach every other breaker space (probably to base of cabinet from knockout, and then looping up to termination point).

Enough to reach the neutral bus bar and a little bit extra (preferably down to midpoint if cabinet and then to neutral bar at top).

Enough to comfortably reach grounding bar.

Question 29

What is the better way to run cable: strut or straps?

Answer 29

In our environment, strut usually looks better.

Question 30

How do you attach seal tight to a rigid pipe?

Answer 30

Use a seal tight connector. Then, thread a rigid (female; bigger) coupling over top.

Remember, rigid pipe and the connector both have external threads (male; inserts). The female side has internal threads (receives the male end).

Question 31

To ensure a snug (not too tight) fit under a breaker or terminal screw, how should you hold your screwdriver?

Answer 31

With the tips of all five fingers, making it as snug as you can that way. Give it a pull and if it doesn’t come out, you’re good.

Show a little copper outside the contact to see that you’re not pinching insulation.

Question 32

What are some standard labelling rules for DC?

Answer 32

Consider the power supply to be its own breaker/feed/supply.

The ac going into it should be labelled. The dc out should be labelled in accordance with what the power supply is named (ie power supply four, for example, should have something like DC 4 + as a label for the output).

If the DC output feeds multiple devices or circuits, each device or separate circuit should have its own breaker, even if the dc output goes to a terminal block first.

If the dc output goes to a terminal block first, then the label will be DC 4 + going to the terminal block. The wires coming out the right side of the terminal block will still have DC 4 +. Once they each hit their own breaker, they will be labelled DC 4 + / A and DC 4+/B, and so on and so on, for instance.

Once a device is hit, and the wire comes out the right side and it’s going back to the power supply, all those wires will be labelled DC 4 -, or DC 4 Zero, as they all terminate now on the neutral bus bar of the PS.

If the wires out of the right do not hit a breaker, they will be labelled dc 4 +, until they hit their respective devices. Then, if the wire goes to another device in series, it’ll be dc 4 +/A or whatever name you choose; if it doesn’t, they will all be labelled dc 4- after they hit the devices.

In short, all electrically identical points will have the same label. The ps acts as a feed in a regular ac panel. There will only be variation in the dc output positive feed labels after they cross breakers or devices.

Question 33

What are some standard rules for labelling AC circuits?

Answer 33

All electronically identical points have the same label.

If circuit 2 from panel zk is supplying power, the label will be ZK 2 L. After every breaker (not terminal block), the label will change to ZK 2 L/A or some other identifier. The neutrals CAN all be labelled as zk n, as they all go to same bus bar, but good practice to say zk n 2 (no need to ever say zk n 2/A as there will rarely be a problem in the neutral conductor needing rectifying that can be made easier with a clear label like that).

Basically, after every breaker, the circuit identifier changes (even if only one breaker, as the labelling system allows for the addition of other devices later on). The label will also change after every device, without breakers in the circuit, except if there’s other devices in series (ie plugs being fed by zk l 2 that are all in series, though in that case labelling won’t really be required as conductor colours will be used to identify hot, and neutral, with the circuit being identified on panel schedule).

Question 34

A side travel is associated with which brand name of switch?

Answer 34

A Go switch ( a go switch is a proximity sensor that senses metal).

The arm that is pushed by the belt during a side travel event is above the go switch and it gets out of position when the belt goes sideways.

Note: a washer above the go switch is a physical bypass of the side travel. This is not to be done. Sometimes however, putting a washer above the switch and then removing it may potentially reset it.

Question 35

When putting a new starter into a bucket, what is the safest way to do it?

Answer 35

Remove the bucket (bus bars will be exposed so be careful) and then mount the starter.

Question 36

If running cable through a metal wall, what can you use in the hole to protect the cable?

Answer 36

A chase nipple (this is a small nipple; it doesn’t have any conduit. It basically consists of threads, a locknut, and an attached unmovable face locknut).

Question 37

What’s procedure or process for drilling and tapping?

Answer 37

Drill a hole that is 2 drill sizes on the drill index smaller than the actual tap (rough guideline; it too difficult just to one size down).

Then, put the tap in (using oil if want to, which is good practise). Keep the drill straight, and drill in slow. Go forward, then reverse out, then forward again until through.

Question 38

If a cable tray is run horizontally and you want to attach a vertical piece to it going downwards, what can you do?

Answer 38

You can attach a shallow strut across the cable tray with channel facing up using clamps (like adding another rung to the tray). Then, you can screw in an L bracket into that shallow strut at midway point. Then, you can use sprint nuts and attach a piece of strut with channel facing horizontal to the l brackets. Then, you can clamp down vertical tray to it (like at sub 2 above feeders).

Question 39

How can you use a beam clamp and a long piece of ready rod (made longer with ready rod couplings) to support multiple strut pieces?

Answer 39

You can slide ready rod through drilled holes into multiple pieces of strut (strut channel can face even horizontal to ready rod; it’s fine). Then, you can use washers and nuts to support bottom side of the channel as well as same thing on top of the channel.

Question 40

How do you mount a sign/label/exit sign/light to concrete walls?

Answer 40

Attach the base to the wall using wedge anchors and nuts (some people use blue inserts with screws as well, but not ideal)

Question 41

What’s best way to strip flexible cord? Also, why is a 3c flex cord diff than 3c teck?

Answer 41

Score it around, and then down the length. Cut the end open and pull apart.

In flex, the ground is counted as a conductor.

Question 42

What is the order of operations for the dumpers? And how does it differ with loci’s?

Question 43

When splicing in a JB, what kind of tape is to be used if the voltage is over 347 volts, and how is it installed?

Answer 43

In applications, regular black vinyl rubber tape is good until 600 volts.

For applications 347 or higher, use rubber splicing tape. Wrap it around the lug/splice/nut whilst pulling tightly (to minimize the chances of a void through which electricity can jump), and then cover in vinyl tape to protect the rubber from chemical contaminants (don’t need to use phase tape to cover rubber splicing tape).

Wrap tight until desired buildup is reached (15 wraps is a safe number).

Question 44

What is an alternative to a stake on?

Answer 44

A stake on is the crimp with the ring on it. This can then be used to splice with another wire by putting a bolt and nut through it.

Question 45

What’s maximum voltage or amperage that can be used with a stainless steel lug?

Answer 45

Very high. That’s why stainless steel bolts and nuts are used to connect load cables to termination points in the feeder cells where the breakers are cased. Not to mention the termination contacts themselves are made of stainless steel.

Question 46

In the dumpers, what must happen (brake wise) to allow the arm to raise?

Answer 46

The haulage brake for the positioned can be set, but the brake for the armature (both are holding brakes) must be released.

Question 47

How do you ensure that a wire isn’t trapped under the borders of the lid of a JB?

Answer 47

Tie wrap the wires into a bunch, or even onto the cables coming into the box to keep them up there and tight.

Question 48

What do two of the known fiber connections look like, and what are their names?

Answer 48

LC’s are the square plug in ones (we needed adapters for them for the Cisco switches). ST’s are the circular ones.

Question 49

In a fiber connection, the red and black ST leads signify what?

Answer 49

One is the return, one is the outgoing transmit.

Question 50

What are ways to connect a pipe to a cable run?

Answer 50

1) You can use a tech connector (which is male) going to a (female) rigid coupling. Otherwise it would be a special type of connector.

2) you can use a box or Lb. If lb, Emt goes into it , tighten set screw, then out other end into liquid tite or something via a threaded connector. If box, then emt to the box, and sealtite on other side.

Note: using a box is much more common and maybe the only alternative if no special connector is available.

Question 51

What is flexible conduit vs seal/liquid tite?

Answer 51

Flexible metallic conduit is the same as sealtite.

Sealtite or liquid tite conduit should be of the metallic type (there is non metallic liquid tite which we don’t use here).

Bx is flexible metallic cable.

Power cord is flexible portable power cord cable.

Question 52

How does the buzzer on SR’s work?

Answer 52

The cover is a plug in to the box basically.

The terminals are the same, as in the neutral and hot can be connected to the terminals in any fashion (as in flipping the hot and neutral on the terminals won’t change anything as it’s AC).

Question 53

Is a cable tray 90 level and equal in distance to the wall from either side of the 90?

Answer 53

Yes. It’s not staggered.

Question 54

How can you transition from a bigger cable tray to smaller and vice versa?

Answer 54

Use a transition piece.

Question 55

How do you bind cable tray?

Answer 55

Use a grounding clamp designed for cable tray.

Drill through the cable tray (doesn’t affect integrity). Then tighten the clamp and put ground wire through it.

Use number 2 ought by default.

Question 56

Should you use galvanized steel with stainless?

Answer 56

No. It will rust and bind over time.

Question 57

How would you tap a half inch hole in a piece of rebar?

Answer 57

Use the bigger drill in the welding shop (you can mess around with it and see the moving parts and stuff, and to take the bit out, you use a metal piece and hammer into the chuck). This is after you drill a big pilot hole.

Then, use a half inch tap along with a ratchet that has a 4 point head, as well as rapid tap or another liquid lube.