Fire extinguishers with a Class C rating are suitable for fires in “live” electrical equipment. Both monoammonium phosphate and sodium bicarbonate are commonly used to fight this type of fire because of their nonconductive properties.
Which of the following should the instructor use to extinguish an electrical fire?
A large voltage is applied to a circuit and a fire is started on a circuit board in the lab. When you inform your instructor, which of the following should the instructor use to extinguish an electrical fire? Class C fire extinguisher.
When using electronic devices in the classroom What is the rule about extension cords?
Ensure that the insulation is in good condition and that the grounding prong has not been damaged. Return any damaged cords to building services for repair or disposal. Extension cords should only be used on a temporary basis. Extension cords should not be used for long periods in place of adequate outlets.
When you enter the electronics classroom you notice there is water on the floor near an electrical outlet the roof appears to be leaking Which of the following should be done first?
When you enter the electronics classroom, you notice there is water on the floor near an electrical outlet. The roof appears to be leaking. Which of the following should be done first? Make sure no one enters and turn the power off to the classroom at the circuit breaker.
What should always be done before working on an electrical circuit?
If at all possible, shut off the power to a circuit before performing any work on it. You must secure all sources of harmful energy before a system may be considered safe to work on. In industry, securing a circuit, device, or system in this condition is commonly known as placing it in a Zero Energy State.
Which of these is the best reason to keep all the classroom aisles and walkways clear?
|What type of footwear should always be worn in the laboratory?||closed shoes|
|What should be used to put out a fire in person’s hair or clothing?||a fire blanket|
|What is the best reason to keep all classroom aisles and walkways clear?||to allow safe exit|
What safety precautions should you use when working with a heat source?
1) Turn off heat sources when they are not in use. 2) Point test tubes away from yourself and others when heating substances in them. 3) Use the proper procedures when lighting a Bunsen burner. 4) To avoid burns, do not handle heated glassware or materials directly.
Can extension cords be used as permanent wiring?
Only use extension cords temporarily; permanent wiring should be installed when use of the cord is no longer temporary. National Electrical Code (NEC) does not allow extension cords in lieu of permanent wiring (NEC 400.8(1) – 2014 Version).
How do you prevent exposed wires?
- Inspect wiring of equipment before each use. …
- Use safe work practices every time electrical equipment is used.
- Know the location and how to operate shut-off switches and/or circuit breaker panels. …
- Limit the use of extension cords. …
- Multi-plug adapters must have circuit breakers or fuses.
How can electrical hazards be controlled?
Electrical Safety Control Measures:
Don’t hang cloth or any material on electrical equipment. Handling of electrical equipment or switchgear shall not be done with wet hand or body. Electrical switches or access to them shall not block by any material. Use appropriate PPE while working on electrical equipment.