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SCE Transmission Groundman > Rigging > Flashcards

Flashcards in Rigging Deck (18)
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1

What is Mechanical Advantage?

The ratio of the output force (acting on a load) produced by a mechanism to the applied effort (the input force). Measure of the force amplification achieved by using a tool, mechanical device or machine system.

2

What are the 6 basic elements of a mechanism?

- Lever
- Wheel and Axle
- Pulley
- Inclined Plane
- Wedge
- Screw

3

What is the Safety Factor?

A ratio used to identify the maximum allowable weight for the load to be lifted, or the Working Load Limit.

4

How do you find the Safety Factor?

Safety Factor = Breaking Strength / WLL

5

What are the basic tools and equipment used when rigging?

- Hooks and Shackles
- Handlines
- Blocks
- Hoists
- Snubbing Chains
- Slings

6

What are the 3 components of a hook?

- Throat Opening for placing the load of an eye
- Eye for rigging a line to
- Hook Latch for keeping the load safely on the hook

7

What are the guidelines for using hooks in rigging?

- Be sure all hooks (except grab hooks and sorting hooks) are equipped with safety catches
- If a hook cannot be safely used, replace it with a shackle
- If you are attaching more than one sling to a hook, use a bolted shackle to keep the hook from spreading
- Never insert the point of a hook in an eye bolt, use a shackle
- Whenever a load passes over employees and hooks are used to attach the load, a safety-type hook, latch, or equivalent shall be used.

8

What are the inspection points of a hook?

- Wear in the saddle of the hook not to exceed 10% of original dimension
- Cracks, severe corrosion, severe nicks or gouges, any other signs of fatigue
- Proper latch operation
- Distortion including twisting, hooks spreading "throat opening" and hook elongation caused by stretching

9

What is a shackle?

U-Shaped fitting with a pin usually used on conjunction with a hook.

10

What are the two common types of shackles commonly used in rigging?

- Anchor (bow type)
- Chain ("D" type)

11

What must a shackle have on it in order to be used?

The WLL must be stamped onto it.

12

What is a handline made up of?

1/2" polyester-polypropylene synthetic rope with a WLL of 700lbs

13

When working on a tower, what must be attached to a handlines?

A Chain Becky.

14

What is a hoist used for and how?

Used for pulling, stretching and lifting. They use a chain, or strap and are mechanically operated as opposed to human force.

15

What are the two types of hoists used by lineman?

- Lever Ratchet Hoists
- Web Strap Hoists

16

What is another name for a Snubbing Chain? And what is it used for?

Dumb Grunt. A tie-down point during rigging on a pole. The Snubbing Chain provides an anchoring point for various types of rigging.

17

What are Wire Pulling Socks used for?

To pull conductor across long spans. the Kellum grip is a wire mesh "sock" that tightens on to the conductor end that ensures a firm grip on the conductor.

18

When is a Capstan used?

To gain mechanical advantage when objects or equipment is too large or heavy for people to lift or carry safely.