electricity second half Flashcards
They automatically open circuit if unsafe current is detected.
electric protective devices
Fuses
melt
breakers
flip
GFCIs
Isolate the load
GFCI cuts electricity off __ of a second if a ground fault is detected.
1/40th
GFCI’S should be used on all _____, or have an assured equipment grounding conductor program.
120-volt, single phase, 15-20 ampere receptacles
Tripping GFCI’s are designed to trip at____.
4-6 milliamps
GFCI’s are not required on permanent power ________.
unless tool used with extension cord
GFCI’S or ____ are required for all temporary power during construcution.
assured equipment grounding conductor program
If a GFCI detects as imbalance as small as ___ it reacts as fast as ___ of a second.
- 5 milliamps
2. 1/30th of a second
GFCI is useless if ground prong is____.
missing
GFCI required on generators ____ or greater.
5 kW or 5,000 watts
GFCI can be built in or added as a ____.
pig tail
All cord sets, recptacles and any equipment connected by cord shall be ______.
Inspected before each days use
Must be kept onsite.
Written program
What is covered by assured grounding?
electric tools/power tools. Cords, plugs, receptacles not part of the building.
Assured Grounding test records are kept by_____.
color coding, other means, written log.
electrical equipment must be inspected____.
before insulation and to make sure it is suitable for it’s intended use.
Listed, labeled, or certified equipment must be used _____.
Per manufacturer’s instructions
All circuit breakers must be_____.
labeled
Access to live parts 50+ volts must be protected by ___ or ___.
restricted areas or physical locations
Accessible by only qualified persons. For example a room or a partition, screened area, balcony, platform.
restricted areas
Elevated 8 feet or more above the floor or working surface.
Physical locations
Specific written procedures adopted by the employer.
Assured Equipment Grounding Program (AEGP)
AEGP must be ___.
kept onsite
Who must implement an AGEP?
competent person
What is the coverage for Assured grounding?
Equipment connected by plug and cord. all cords, plugs, and receptacles and power tools.
Assured grounding test records are kept how?
by color coding, and other means, and by written log
Electrical equipment must be…..
- Inspected bfore insallation
2. Suitable for the intended use.
Listed, labeled, and certified equipment ______.
to be used per manufacturer’s instructions
All ___ must be labeled.
circuit breakers
electrical rooms must be____.
marked
must use splicing devices designed for that purpose (wire nuts) or by brazing, welding, or soldering.
splicing conductors
manufacturer’s information must be legible. What must be provided?
Manufacturer’s name, trade mark, voltage, current, and wattage.
Must have access and “elbow room”. Access must be maintained around all electrical equipment. Work spaces clearances are a minimum of ____ in front of elec. equip.
3 ft squared
Controls on equipment must be _____.
lock out/tagged out
How do you prevent energizing circuits?
Circuits that are de-engerized must be taggedout/lockedout.
What must be done to live wires?
Insulation
Use words that have ____ and are marked for ______.
three prongs and that are marked for hard or extra hard usage.
Use only cords, connection devices, and fittings equipped with _____.
strain relief
removed cords by____.
pulling on plugs
A low-resistence path from a tool to the earth to disperse unwanted current.
grounding
Energy flows through the ground wire and not you! To the ground protecting you from electrical shock, injury or death.
When a short occurs
What is the most frequent osha violation?
Missing ground on extension cord
This situation can cause arching and a fire in the area where the overload exists. Even inside a wall.
Overloading circuits
They automatically open circuit if unsafe current is detected-they “shut off” electricity.
Electric circuit protective devices.
