1-2 / lesson 7 Protective line devices, care and use

The most common live-line work method on distribution voltages in the electrical industry is the ? method. a. bare hand b. hot stick c. PPG d. rubber glove

d. rubber glove

New rubber goods issued to a Qualified Electrical Worker can be assumed to be in good condition. Select one: True False

false

Rubber blankets are the only things used to cover insulators. Select one: True False

false

Rubber protective line hose provides the Qualified Electrical Worker an absolute barrier against injury while working on energized conductors. Select one: True False

false

A rubber line hose is used to protect Qualified Electrical Workers from accidental electrical contacts. Select one: True False

true

Odd-shaped conductors and equipment can usually be covered best with a rubber insulating blanket. Select one: True False

true

The strain or elongation of rubber is caused any time the rubber is distorted from its natural shape. Select one: True False

true

All rubber insulating protective equipment must be treated with care, kept clean, and ? . a. air dried when cleaned b. inspected at regular intervals c. stored out of the environment in metal cylinders d. tested monthly

b. inspected at regular intervals

The highest maximum use voltage for rubber insulating equipment for a phase-to-ground exposure is ? . a. 16 kV b. 26 kV c. 36 kV d. 46 kV

c. 36 kV

How should rubber blankets be stored when on the truck? a. Folded in a bin b. Hung up in the bed of truck c. In PCV tubes or a canvas bag d. Thrown in a bin on the truck

c. In PCV tubes or a canvas bag

To prevent tie wires from contacting the crossarm when conductors are being tied or untied, ? are used. a. doubled-up rubber blankets b. flattened-out rubber line hoses c. high-dielectric-strength polyethylene crossarm covers d. hot-line holding tools

c. high-dielectric-strength polyethylene crossarm covers

A natural enemy of rubber that can be removed by hot, soapy water is ? or grease. a. corona b. creosote c. oil d. ozone

c. oil

Two things that contribute to ozone cutting damage of rubber are misapplication and improper ? . a. cleaning b. handling c. storage d. testing

c. storage

Ozone is created by ? from the oxygen in the air, generally in quite low concentrations, but enough to damage rubber over time. a. moisture b. static electricity c. sunlight d. ultra violet rays

c. sunlight

A second point of contact is the point ? . a. during the contact when equal potential grounding reduces the current value to zero b. when protective equipment opens the circuit c. where current leaves the body if contact is made with a hot circuit d. where grounds are attached to the neutral

c. where current leaves the body if contact is made with a hot circuit

A rubber blanket rated for 20,000 volts is placed over a line hose that is also rated at 20,000 volts. This combination of protective equipment has an insulating value of ? . a. 20,000 V b. 30,000 V c. 40,000 V d. 60,000 V

a. 20,000 V

The use of the protective equipment should be ? , along with all other aspects of hot-line work. a. carefully planned b. discussed at the morning briefing c. regarded casually d. second nature to the Qualified Electrical Worker

a. carefully planned

All line hoses should be ? . a. cleaned and inspected regularly b. kept clean and lubricated c. stored in a metal cylinder d. tested for insulation integrity every 6 months

a. cleaned and inspected regularly

Line hose is available in varying lengths and in diameters ranging from 1" to ? . a. 1 1/4" b. 1 1/2" c. 2" d. 2 1/2"

b. 1 1/2"

A conductor cover, fabricated from high-dielectric polyethylene, clips on and covers conductors up to ? in diameter. a. 1" b. 2" c. 3" d. 4"

b. 2"

The minimum distance between the cuff of a class 2 rubber glove and the cuff of the leather protector is ? . a. 1" b. 2" c. 3" d. 4"

b. 2"

A line hose provides Qualified Electrical Workers ? when used on energized conductors. a. a place to lie across to work on an outside phase b. a margin of safety, for error without injury c. a safe barrier against grounding themselves d. the right to break the minimum approach distance of phase-

b. a margin of safety, for error without injury

A luminous discharge due to ionization of air surrounding an electrical conductor with a voltage gradient exceeding a certain critical value is called ? . a. arc flashing b. corona c. flashing over d. radiation exposure

b. corona