Electricial Rigging

Question 1

Electrical code requirements for labeling single conductors

Answer 1

6 inches of colored electrical tape

Question 2

Ground knot label

Answer 2

two strings tied twice

Question 3

Neutral Knot label

Answer 3

two strings tied once

Question 4

Blue knot label

Answer 4

no knots “blue sky clear”

Question 5

Red knot label

Answer 5

one string tied once “one red eye”

Question 6

Black knot label

Answer 6

one string tied twice “two black eyes”

Question 7

Label each distribution box with… (3)

Answer 7

1) power source
2) Type of power
3) Intended function of the circuit

Question 8

identifying two different kinds of service on the same set

Answer 8

differently colored tape or ink on labels

Question 9

Lacing cable

Answer 9

lace conductors on run of feeder cable, keeps cables lying flat and straight, prevents rolling, identifies different runs

Question 10

Why not cover cable with plywood or lauan

Answer 10

does not provide ventilation, known to start fires

Question 11

o-zone

Answer 11

area outside the protected rails fo the catwalks in the perms. need fall protection

Question 12

pin-splitter tool

Answer 12

bends apart smooshed pins, bad, bent contacts in bates can cause flicker problems

Question 13

waterfall

Answer 13

vertical run of cable going into the perms, or coming back down.
4/0, socapex, 60 or 100A dimmer lines
rig a spare

Question 14

loop knot

Answer 14

provides a closed loop, used to tie a line to a light to hoist it

Question 15

hitches

Answer 15

knots used to tie off a rope to a fixed object, or to tie a rope around an item so the rop confroms to the item to whih it is tied
may constrict or bind so as to make a tight hold on an item when under tension, such as a vertically hanging cable

Question 16

bend

Answer 16

a knot tht ties one line to another line, such as when passing the two loose ends of the tie-line around the post and tying them together

Question 17

dressing a knot

Answer 17

making sure that the knot is formed correctly and that the lines pass out of the knot in the correct way

Question 18

setting a knot

Answer 18

tightening the working elements of the knot, often y pulling on the working end of the rope, so that the knot cannot be shaken loose
..

Question 19

Three types of loop knots

Answer 19

Bowline, Bowline on a night, alphine butterfly

Question 20

Four types of binding hitches

Answer 20

Clove hitch, Prusik, Rolling Hitch, Constrictor knot

Question 21

Three other hitches

Answer 21

High Safety knot, highwayman’s hitch/draw hitch, trucker’s hitch

Question 22

Bowline

Answer 22

commonly used to tie rope to the requipment for hoisting or hanging
strong and secure if tied correctly

Question 23

Clove hitch

Answer 23

commonly used to tie a line to cable, to suspend a cable drop, or as a tieline for the cable.
weight of the cable makes the knot rip the cable.
not as reliable as other binding knots
must be oriented so taht the rop passed around the far side of the cable first, not oriented such that the lines converge into the knot before they pass around the cable

Question 24

Square knot

Answer 24

very commonly used, not considered a very strong bend.

right over left, left over right

Question 25

Three bends

Answer 25

square knot, alpine butterfly bend, flemish bend or figure eight bend

Question 26

What determines strength of rope- (4)

Answer 26

type of knot you tie, age and condition of the rope, type of rope, thickness of the rope

Question 27

tensile strength

Answer 27

breaking point of rope when brand new under a static load, no knots

Question 28

WLL

Answer 28

work load limit- load limit can be routinely put on the rope in straight tension, allows a margin of dafety and longevity of the line
typically 10-25% of tensile strength

Question 29

Static load

Answer 29

Just hangs, no load is purely static

Question 30

Dynamic loading

Answer 30

Rope tugs, stops or starts in raising and lowering, swings.

Can require a rope 10× as strong as static load

Question 31

Knots decrease strength of rope

Answer 31

Rate rope to 50% of nominal strength (will)

Question 32

WLL of 1/4 in manila rope

Answer 32

54 lbs

Question 33

WLL manila rope 3/8 in

Answer 33

122 lbs

Question 34

1/2 in WLL manila rope

Answer 34

264 lbs

Question 35

WLL manila rope 5/8 in

Answer 35

496 lbs

Question 36

WLL manila rope 3/4 in

Answer 36

695 lbs

Question 37

Hemp/jute

Answer 37

Manila rope
Knots well (not slippery)
Will not melt
Degrades ober time with heat, use chain, aircraft cable safeties

Question 38

Nylon, polyester, Dacron, pro-manila pros

Answer 38

Better tensile strength

Better able to withstand shock, heat sunlight

Question 39

“Pipe”

Answer 39

1 1/2 in IPS 1.9in OD schedule 40 steel pipe

Question 40

Check list for hanging lights above set

Answer 40

Leave two loops of slack at each head for pan, tilt, moving
Sash cable neatly at regular intervals
Label each light visible from below, label powercord the same number
Lights power switch on
Tighten nuts on c-clamp
Safety cable loops through the bail and over pipe to prevent light falling. Barn doors and chimeras also safeties ( aircraft for smaller, nylon webbing or chain for larger lights)
Don’t wear tool belt

Question 41

Rigging light with trapeze

Answer 41

Raised the old fashioned way with block and tackle

Lights tied off with guide lines, secured with chain

Question 42

Single whip block and tackle

Answer 42

Mechanical advantage = 1

Question 43

Single whip block and tackle with block at weight

Answer 43

Mechanical advantage = 2

Question 44

Gun tackle purchase

Answer 44

Mechanical advantage = 2

Question 45

Luff/Watch tackle

Answer 45

Mechanical advantage = 3

Question 46

“wringing out”

Answer 46

Checking distribution system for short circuits, continuity, correct voltage, and line loss