Protective line devices, cares and use

Question 1

What is the common equipment to use to perform live maintenance

Answer 1

Rubber Gloves

Question 2

Other than rubber gloves all other rubber cover up equipment are intended for what

Answer 2

protection against an accidental brush contact

Question 3

what is the definition of a second point of contact

Answer 3

Is defined as the point where current leaves the body if contact is made with a hot circuit

Question 4

What is OSHA 1910.137

Answer 4

Electrical Protective equipment

Question 5

what does Osha 1910.137 Electrical protective Equipment use as refernce

Answer 5

ATSM (American Society for Testing and Materials) protective equipment standards

Question 6

What are rubber sleeves protective standard code

Answer 6

ASTM D 1051

Question 7

What are insulating blankets protective standard code

Answer 7

ASTM D 1048

Question 8

What are insulating mats protective standard code

Answer 8

ASTM D 178

Question 9

What are rubber hoods protective standard code

Answer 9

ASTM D 1049

Question 10

What are Line hose protective standard code

Answer 10

ASTM D 1050

Question 11

What should you do when you are issued new rubber goods

Answer 11

Never assume the equipment is in good condition. Check for test dates, which should be printed on the equipment, and do a visual inspection

Question 12

Rubber gloves should be store in……

Answer 12

canvas bag with the cuff facing down

Question 13

Rubber blankets are used for what…..

Answer 13

to cover odd shape Equpment and conductor

Question 14

What are the diameter of the line hoses

Answer 14

1 to 1 1/2 inches

Question 15

Where should be store at

Answer 15

in canvas bags or sealed containers

Question 16

what type of polyethene sizes

Answer 16

there are various sizes such as one that can wrap around a pole and those that can wrap around a conductor 2 inches of diameter also, they are constructed for cross arms single and doubles, and insulator pins

Question 17

what are rubber hood purpose

Answer 17

are designed for rubber line to be inserted into them

note it also covers pin, post type insulator

Question 18

What ither names for ozone

Answer 18

corona cutting, ozone deterioration, oxidation and cracking

Question 19

Where is ozone present and how its made

Answer 19

its in the air. created by sunlgiht from oxygen in the air.

it at low concentration but high enough to damage rubber

Question 20

What other things can create ozone

Answer 20

Electricity in moderate to high discharge such as arcs, sparks form machinery and lightning also create ozone

electrical corona also produces high concentration of ozone

Question 21

what is the definition of corona

Answer 21

a luminous discharge due to ionization of air surrounding an electrical conductor with a voltage gradient exceeding a certain critical value

Question 22

corona occurs where

Answer 22

im most high voltage and as little voltage as 2400 volts

Question 23

The action between rubber and ozone is consider what?

Answer 23

rubber resistance to ozone

Question 24

what is the minimal elongation strain a rubber can have before corona damage

Answer 24

2%

Question 25

The maximum rate of damage that can rubber get from ozone happens when

Answer 25

When the rubber is elongated 10% to 20%

Question 26

When does elongation or strain happens on the rubber

Answer 26

Any time is distorted from it from its natural shape

Question 27

How to tell the rubber has ozone damage

Answer 27

when the surface area covered with many fine lines or cuts, usually perpendicular to the strain, which often connect into distinct cuts. These become more apparent when the rubber is rolled or stressed for inspection to open up the cuts.

Question 28

What are the 2 causes that make ozone cutting

Answer 28

misapplication and improper storage

note also when ozone is present

Question 29

Where can ozone be found

Answer 29

It can be found in close dark room with no vitiation. Thats its lowest form

It highest form is in sunlight and around machinery

Question 30

What should you do to take care of rubber blankets

Answer 30

Blankets should be laid flat while in long-term storage. They may be rolled and kept in PVC tubes or canvas bags, but never folded when on the trucks. Crease marks caused by lasting folds, sharp bends, or continued distortion set up a stressed condition and invite corona damage.

Question 31

What should you do to take care of rubber line hoses

Answer 31

Line hoses should not be bent to fit into small compartments.

Question 32

What should you do to take care of rubber sleeves

Answer 32

Rubber sleeves should be rolled lengthwise while stored in trucks and kept in canvas bags.

Question 33

What should you do to take care of rubber gloves

Answer 33

Do not store or use rubber gloves turned inside out. The reversal from the original set of the rubber sets up a sufficient amount of strain that can induce severe cracking, especially under the influence of ultraviolet (sunlight) or ozone (electrical apparatus).

Do not store rubber gloves or other protective equipment in substations or other locations where there is a likelihood of corona or a spark discharge. A very small concentration of ozone causes rapid oxidation of rubber.

Question 34

What should you do with leather protective gloves

Answer 34

Leather protector gloves should be replaced if they no longer give adequate protection to rubber gloves. Oil-soaked protector gloves should not be used over rubber gloves; they should be replaced.

Question 35

what are the enemies of rubber

Answer 35

Oil and grease are natural enemies of rubber. If exposed to either, rubber should be cleaned with hot, soapy water. After such an exposure, the gloves should be electrically tested.

Question 36

where should you keep glove and sleeve

Answer 36

Gloves and sleeves should be protected from injury by keeping them in glove bags or sleeve bags when not in actual use.

Question 37

What should line hose and blanket never be use for

Answer 37

Line hose or blankets should never be used to insulate one conductor from another. The rubber goods are designed and intended for personal protection only. The combination of mechanical strain and voltage can injure the rubber and make them unsafe for further use.

Question 38

Why doubling rubber is not smart

Answer 38

Doubling of rubber goods does not increase their insulating value. If a rubber blanket is good for 10,000 volts, two blankets stacked on top of each other still have an insulating value of 10,000 volts.

Question 39

Metal dust do what to rubber

Answer 39

Metal dust as is created in truck tool bins from bolts, etc., will contaminate rubber goods. Rubber goods should not be carried in these bins unless they are protected from contamination by being stored in appropriate containers.

Question 40

When does phase to phase exposure exist

Answer 40

whenever it is foreseeable that an employee, or the longest conductive object he or she may handle, can simultaneously breach the electrical components of the MADs of live parts energized at different phase potentials, taking into account such factors as: the nature of the work being performed, the physical configuration and spacing of the conductors, the proximity of grounded objects or other circuit conductors, the method of approach to the conductors, the size of the employee, the tools and equipment being used, and the length of the conductive object.

Question 41

When does phase to ground exposure exist

Answer 41

whenever it is foreseeable that an employee, or the longest conductive object he or she may handle, can simultaneously breach the electrical component of the MAD of an energized conductor and a grounded surface.

Question 42

How to determine MAD of phase to phase and phase to ground is by

Answer 42

subtract two feet from the value listed for the system voltage

Question 43

What is the relation between MAD and Rubber

Answer 43

Rubber lets the person handle the energize component that Minimal approach distance doesn’t allowed until its cover and safe to handle