Practical Electricity Module Assignment Flashcards
What are the 2 hazards of electrical shock
- Burns
- Affect the heart(electrical system of body)
Why should you not open disconnects under load?
The blades of the disconnect aren’t designed to open under load, they move too slow to extinguish the arc cause by breaking a circuit.
Each person working on a piece of equipment must ______ ______ before proceeding with the work.
Lock Out
Before turning off the disconnect or breaker for a piece of equipment for lockout purposes, you must…..
Shut equipment off at control centre.
Why are tags used in addition to locks when locking out equipment?
They provide a reason to why the equipment is locked out.
Why is a missing junction box cover a hazard?
Dust and Water can enter causing a fire
What do dimly lit lamps indicate?
A low voltage condition, get electrician to investigate.
Circuit breakers are _________ acting than fuses.
Slower
What is the difference between a disconnect and a circuit breaker?
A disconnect uses fuses to open the circuit when a fault level is reached.
A circuit breaker uses magnetic and thermal sensing devices to trip a mechanical circuit opening switch.
What are the two main actions a fuse takes when its link melts?
- Opens the circuit
- Limits the current to a safe level
What should you do before using a multimeter?
Read the instruction manual
What should you do when measuring voltage of an unknown value?
Start at the highest setting, decrease setting as needed.
What is the critical thing to be sure of before measuring ohms?
That there is no power in the circuit under test.
The ammeter part of a multimeter must always be connected in _______ with the load.
Series
What precautions must you take when reading voltage or amperage?
Do not come into contact with any live parts
