Electrical Fault Finding 4

The risk of electric shock during fault finding can be greatly reduced if

• The supervisor keeps the keys to any lock off devices

• All employees have the same qualifications and experience

• All isolators and switches are correctly labelled

• Only calibrated test equipment is used

Which of these pictures shows the correct setting for using a multimeter to safely measure a.c voltage?

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During the periodic inspection of an industrial installation, the engineer notes the absence of any main protective bonding. What action should the engineer take?

• Identify on an Electrical Installation Condition Report, that there is a potentially dangerous situation and urgent remedial action is required

• Isolate the installation and classify as C1 on a Periodic Inspection Report, to identify that there is danger present and immediate remedial action is needed

• Tell the owner that having no protective bonding is classified as C3, and an improvement is recommended

• Inform the person responsible for the installation, that it does not comply with BS 7671, but it is not unsafe

A safe system of work has been planned for a large installation. Which document will need to be produced?

• Permission to operate

• Secure system of operation

• Building control notification

• Permit to work

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

• Within 3 months

• When the repair is finished

• Halfway through the job

• Within 1 month

An electrician is working in a small high street shop and explains to the owner that it is necessary to isolate the electrical supply. In order to safeguard his customers what should the owner do?

• Only allow a limited number of customers into the shop

• Close the shop until power is restored

• Have staff escort customers round the shop

• Install temporary lighting

An engineer has just completed an Electrical Installation Condition Report. What action should the engineer now take?

• The local Authority should be sent the original report, and a copy given to the person who ordered the report

• The person ordering the report should be given the original report and the engineer should keep a duplicate copy

• The owner of the installation should be given the original report, with a copy going to the Local Authority, and the person who requested the report, if this is not the owner.

• The engineer should keep the original report, and send a copy to the National Inspection Council

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?

• The production manager, to ensure that the most appropriate decisions can be made

• The electrical wholesaler, in case any more materials are needed at short notice

• The factory owner, so that a new profit forecast can be made

• The health and safety representative at the factory, because work is being carried out overhead

An electrician has been called to a fault on a control panel and finds there are no indication lights illuminated. What is the most likely cause of the problem?

• Loss of supply

• The emergency stop has been pressed

• The indication light bulbs have all blown

• The overload has tripped

When a vacuum cleaner is plugged into a particular socket it intermittently stops working. What is the most likely cause?

• The plug contains the wrong size fuse

• A broken earth wire in the plug

• A loose cable in the socket

• The motor has burnt out