Technicians always perform this action first when working on an electrical circuit in a residential setting:
Turn off power at the service panel
. … Electrical shock and burns. Three different technicians are working on different parts of the same piece of equipment.
What danger is created when a technician uses a circuit breaker that's too large for a circuit?
What danger is there to using a circuit breaker that is too large for a circuit? If wiring in the circuit is allowed to pass too much current,
it will overheat and cause conductor failures and fires
. An electrical circuit is composed of a power source, a path for current to flow, and: a load.
What is the first thing a technician must do before attempting to diagnose an electrical circuit?
Perform
starter circuit voltage drop tests
; determine needed repairs. Disable the ignition and fuel system before performing these tests. Check the voltage drop between each component in the starter circuit while operating the starter motor. Voltage drop between each component should not exceed .
What tool should be used to determine if an electrical circuit is energized or live?
Voltage testers and receptacle analyzers
detect the presence of electrical voltage. They can be used for cable, wires, circuit breakers, light fixtures, outlets and switches. Testers and analyzers indicate if power is off at an outlet or if a device is connected properly.
What can detect when a technician is receiving an electrical shock and turn off the power?
A ground fault circuit interrupter (GFCI) works by: Comparing the current on both legs of the circuit. Which of the following devices can detect when a technician is receiving an electrical shock and turn off the power? …
They sense too much current
.
What are the 7 steps of troubleshooting?
The steps are:
identify the problem, establish a theory of probable cause, test the theory, establish a plan (including any effects of the plan), implement the plan
, verify full system functionality, and—as a final step—document everything.
What do you need to do before attempting to troubleshoot the electrical circuit?
- Gather information. …
- Understand the malfunction. …
- Identify which parameters need to be evaluated. …
- Identify the source of the problem. …
- Correct/repair the component. …
- Verify the repair. …
- Perform root cause analysis.
How do you fix a overloaded circuit?
The short-term solution to a circuit overload is easy – move some devices from the overloaded circuit to another general-purpose circuit. Then you can
just flip the circuit breaker back on or replace the fuse
.
How do I know if my breaker panel is overloaded?
Buzzing or Sparking
If you hear a buzzing sound or see sparks near the service panel, this indicates a major electrical problem. Overloaded circuits can damage breakers, connections and wiring, leading to arcing that creates sparks or buzzing noises, as well as a very serious risk of fire.
What happens when a breaker is overloaded?
When there is a circuit overload,
the breaker will trip and open up, which shuts off the power supply to that circuit, cutting off electricity
. … If there wasn't a breaker, the overload would cause the wiring to overheat and possibly even melt, which could start a fire.
How do I test an electrical wire with a multimeter?
Set a multimeter
to measure voltage
. Insert a probe into each slot and read the line voltage measurement. A properly working outlet gives a reading of 110 to 120 volts. If there is no reading, check the wiring and the outlet.
How do you touch a live wire without getting shocked?
If you
have dry hands
— one hand touching a live wire, the other hand in your pocket — and your feet on a dry, rubber mat, there's far less danger from the same amount of voltage because your resistance is higher.
How is electrical safety into consideration?
- Check that you're using the correct wattage in all your fixtures and appliances. …
- Watch out for overloaded outlets to protect your home. …
- Replace or repair damaged electrical cords to keep your home safe. …
- Keep your used and unused cords tidy and secure to prevent damage.
What is the best way to avoid electrical shock?
- Inspect electric cords for fraying. …
- Do not plug too many things into the same outlet. …
- Replace all older two-pronged outlets. …
- Insert plastic safety caps in all unused electrical outlets if small children are in the home.
