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Flashcards in Electrical Deck (387)
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If a person forms a closed circuit through which current can flow, and the power source supplies a voltage causing current to flow, a voltage of _____ or less, the person will be killed

115 volt

1

Use a _____ when you work in a damp or wet location

Dry wooden platform to sit or stand on

2

Place ___ between you and the wood surface you're working on

Rubber matting or other non conductive material

3

What kind of tools and flashlight should you use when working on exposed electrical equipment

Insulated tools Nonmetallic flashlight

4

Electric shock may be avoided by using safety equipment such as ____

Deck coverings and rubber gloves

5

Prevents electrical shock to anyone who may touch bare, energized, or ungrounded circuits

Insulated deck covering

6

Rubber floor matting must conform to

Military specification Mil-M-15562

7

Gives approved deck coverings for every space

NSTM, chapter 634, table 634-1

8

Repair defective matting by ____

Covering the affected area with a new piece of matting

9

Foreign substances on matting contaminate or impair its ____

Dielectric properties

10

The dielectric properties of matting can be impaired or destroyed by ____

Oil, embedded metal chips, cracks, holes, or other defects

11

The primary feature discriminating one class of glove from another

Maximum safe voltage of the glove which is determined by its thickness

12

Class 0 gloves have a maximum safe voltage of _____ and labeled ____

1000 volts Red

13

A class 1 glove has a maximum safe voltage of _____ and is labeled _____

7500 volts White

14

A class II glove has a maximum safe voltage of ____ and is labeled _____

17500 volts Yellow

15

A class III glove has a maximum safe voltage of _____ and is labeled _____

26500 volts Green

16

To inspect rubber gloves for tears, snags, punctures, or leaks that are not obvious _____

Hold the glove downward, grasp the glove cuff, and flip the glove upward to trap air inside the glove. Roll or fold the cuff to seal the trapped air inside, then squeeze the inflated glove and inspect it for damage

17

For additional info on rubber gloves, refer to ______

NSTM, chapter 300

18

Who must approve work to be done on energized circuits

CO

19

Coat metallic hand tools with _____

Plastisol or cover them with two layers of rubber or vinyl plastic tape, half-lapped

20

When working on live or hot circuits, you must be ____

Supervised and aware of the danger involved

21

Refer to _____ for instructions on the use of plastisol

NSTM, chapter 631

22

If you don't have enough time to apply plastisol or tape ____

Cover the tool handles and their exposed parts with cambric sleeving, synthetic resin flexible tubing, or suitable insulation

23

In a shipboard real ungrounded system, the factors of _____ must be considered

Resistance (R) Capacitance (C)

24

Insulation resistance of a system is periodically measured with ______

500-volt DC megger

25

If you are using a megger to check for ground in the system, and you get a reading of _____, you can conclude that no low resistance ground exists

50000 ohms resistance

26

System capacitance exists in parallel with ____

Resistance

27

The main reason we ground power tools and equipment is for ____

Safety

28

Proper grounding can prevent lethal shocks by ____

Limiting voltages due to line surges or unintentional contact with higher voltage lines

29

When using a multimeter to check continuity of the ground conductor from the tool case to the dummy receptacle, you should make sure the reading is ____

Less than 1 ohm