Instrument used for testing have met the requirements of

An electrician discovers a tripped circuit breaker in a factory's control panel and there are no immediate replacements available. The safest immediate action to take is to

According to HSE Guidance Note GS38, what is a requirement for test probes?

When should maintenance reports and records by fully completed for any repair work?

An electrician needs to perform maintenance on the electrical system of a small store. What should the store owner do to ensure customer safety during this period?

Following the repair of an electrical fault and on completion of testing, a copy of the report or certificate should be given to the

An engineer is replacing some wiring and damaged overhead trunking at a small furniture factory and production of one section has had to be stopped for the work to be done. Who does the engineer need to keep informed about the progress of the repair and why?

An electrician is called to a problem on a 3-phase motor. The operator reports there was a louder than usual humming from the motor shaft which appeared to vibrate rather than rotate. What is the likely cause of the problem?

Where earth fault impedance values cannot be satisfied, one solution is to fit an

RCD devices will operate when, between live conductors, there is detected

An electric shower unit is fed from a 40A ceiling pull switch, but after several years of use, the shower stops working. Investigation shows that the switch contacts are blocked and the first few centimetres of the cable cores ‘PVC insulation has become charred and melted. Identify the two most likely causes from the list below.

A socket outlet is damaged and badly discoloured. What is the likely cause?

Transient voltages are more usually caused by

During a routine check, it was found that the insulation resistance between the live conductors and the cpc of a 230V motor connection point has dropped from 100MΩ to 30kΩ over the past three years. What could be a likely cause?

What type of fault occurs when two conductors are mistakenly connected together?

The type of fault associated with an open circuit might be

A circuit breaker in a consumer unit keeps tripping. An electrician carries out an insulation resistance test between live and earth and gets a reading of 3Ω. What is the likely cause of the circuit breaker tripping?

What is the maximum operating temperature for twin and earth, PVC insulated cables?

When the start button of a conveyor belt is pressed, the contactor energises, and the belt starts. When the start button is released, the motor stops. The most likely location of the fault is

All test equipment which is used close to flammable gages must be

Special precautions should be taken to avoid or control electrostatic discharge when working with

When connecting a large number of lead acid cells, such as an electric vehicle or emergency power supply, extra care must be taken to prevent

Which document is the most valuable when a fault has been reported on a piece of equipment?

When called to find a fault on a machine, identify two good initial steps to take

A 30mA RCD is tested and suspected of being faulty. When a current of 5 times IΔn is used to test it, the device should operate within

The test instrument being used in this picture is

Which of these test instruments is used to check phase sequence?

How often should a phase sequence tester be calibrated?

Which of these tests is carried out with the supply turned off?

Which of these tests must the supply be turned off before carrying it out?