Rigging

Question 1

What is Mechanical Advantage?

Answer 1

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.

Question 2

What are the 6 basic elements of a mechanism?

Answer 2

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

Question 3

What is the Safety Factor?

Answer 3

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

Question 4

How do you find the Safety Factor?

Answer 4

Safety Factor = Breaking Strength / WLL

Question 5

What are the basic tools and equipment used when rigging?

Answer 5

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

Question 6

What are the 3 components of a hook?

Answer 6

• 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

Question 7

What are the guidelines for using hooks in rigging?

Answer 7

• 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.

Question 8

What are the inspection points of a hook?

Answer 8

• 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

Question 9

What is a shackle?

Answer 9

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

Question 10

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

Answer 10

• Anchor (bow type)

- Chain (“D” type)

Question 11

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

Answer 11

The WLL must be stamped onto it.

Question 12

What is a handline made up of?

Answer 12

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

Question 13

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

Answer 13

A Chain Becky.

Question 14

What is a hoist used for and how?

Answer 14

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

Question 15

What are the two types of hoists used by lineman?

Answer 15

• Lever Ratchet Hoists

- Web Strap Hoists

Question 16

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

Answer 16

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

Question 17

What are Wire Pulling Socks used for?

Answer 17

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.

Question 18

When is a Capstan used?

Answer 18

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