NSTM 300 - Electric Plant

Question 1

What unit is the measure of electric shock intensity?

Answer 1

Current (Amperes)

Question 2

What level of current will a person be unable to let go?

Answer 2

10 Milliamps

Question 3

What level of current can be fatal if felt for more than 1 second?

Answer 3

100 Milliamps

Question 4

PPE is required when working with what voltage?

Answer 4

30 Volts and above

Question 5

What are the symptoms of electric shock?

Answer 5

Pale, bluish color, weak pulse/breathing, body stiffness

Question 6

If someone experiences electric shock, what action should be taken for loss of breathing?

Answer 6

CPR

Question 7

What are the first two steps when someone is being electrocuted?

Answer 7

Shut off power (or remove victim with dry, non-conductive material)
Administer first aid

Question 8

What is a flash protection boundary?

Answer 8

Unobstructed standoff distance from an energized circuit in which unprotected skin could receive a second degree burn from an arc flash

Question 9

What is the purpose of equipment grounding?

Answer 9

Provide low resistance path away from human in event of electrical or mechanical failure

Question 10

What is an EMI Filter used for?

Answer 10

To reduce the amount of interference to shipboard electrical and electronic systems

Question 11

What are TVSS systems?

Answer 11

Transient Voltage Surge Suppression Systems. Absorb and clamp voltage spikes on the main AC bus.

Question 12

What are Arc Fault Detection Systems?

Answer 12

Installed on electrical switchboards and load centers, they detect an Arc Flash and send an open signal to the switchboard to minimize damage

Question 13

Work on energized systems above this voltage is prohibited unless approved by NAVSEA

Answer 13

1000 Volts

Question 14

When may interlocks be “cheated”?

Answer 14

Only when using an approved procedure (3M)

Question 15

Whose approval is required for work on energized electrical equipment over 30 volts?

Answer 15

Commanding Officer

Question 16

What are some safety precautions when working on energized equipment?

Answer 16

All metal removed from person, rubber gloves, work with one hand only, insulate deck, dry clothes, CPR qualified person on scene, safety observers with non-conductive tools and safety line (over 300 volts)

Question 17

What are STW Checks?

Answer 17

Safe-to-Work checks - When equipment has been verified reenergized, but comes into question after long periods without work, change in boundaries, or other changes

Question 18

What safety checks must be completed during STW checks?

Answer 18

Verify Danger Tags, WAFs, TORs, MRCs, and voltages

Question 19

When do STW checks not need to be completed?

Answer 19

When working with under 30 Volts

Question 20

What is “deranged equipment” now called?

Answer 20

Damaged equipment