Book 1 Safety Flashcards
At what amperage will you get grip paralysis threshold (brain says let go, hand will not listen)?
15–50mA
If you work on energized circuits, what is the safest way to do your business?
De-energized all circuits regardless of the voltage.
What Air Force instruction states that you will normally de-energize electrical circuits and equipment before performing maintenance unless approved by the Base Civil Engineer?
AFI 91–203.
What commercial standard deals with electrical safety in the workplace?
NFPA 70E.
What happens to metal during an arc flash?
Metal at the arc site expands and vaporizes.
What are some of the typical equipment items that arc flash warning labels would be on?
Pad-mounted transformers, switchgear, switchboards, panel boards, disconnect switches, industrial control panels, meter socket enclosures, and motor control centers.
When is an unqualified person allowed to cross the limited approach boundary?
When escorted by a qualified person.
Which approach boundary requires use of shock protection techniques and equipment because of its proximity to a shock hazard?
Restricted approach boundary.
What approach boundary will only be crossed by qualified personnel who have the same protection as if they were coming in contact with energized components?
Prohibited approach boundary.
How should you lift an object to prevent a serious back injury?
With your legs
What factors contribute to the severity of electrical burns?
(1) Length of contact with current.
(2) Strength of current.
(3) Type of current AC or DC.
(4) Direction, or path, of current through the body.
Why should you elevate the legs of a person in shock about 12 inches, unless you suspect head,
neck, or back injuries?
This will help the blood return to the main organs.
