GMJ 6035 electrical quiz NEW 4

Which one of the following is the potential danger if temporary earth continuity is not applied when removing sections of copper pipework?

• The consumer unit could be totally damaged beyond repair.

• Death or serious injury to any persons through electric shock.

• Excessive consumption of electricity whilst carrying out the plumbing work.

• All the appliances connected to the ring main could blow their fuses.

An electrical system using an mcb device that is to be safely isolated requires

• the fuse to be removed

• cross bonding to be fitted

• the mcb covering with insulating tape

• a locking device to be fitted.

A purpose of temporary continuity bonding is to

• maintain an uninterrupted conductor to earth when removing pipework sections

• provide a method of temporarily isolating the supply avoiding the need to turn off the main

• bypass the mains supply from the consumer unit to a faulty appliance as a temporary repair

• bridge the supply from the consumer unit to an appliance so polarity testing can be completed

The most important safety precaution when working on a macerator WC is to ensure that the supply is

• isolated at the appliance

• isolated at the consumer unit

• disconnected before the meter

• disconnected before the consumer unit.

Before isolating a supply at the consumer unit in an occupied domestic dwelling situation the plumber should advise the

• Local Authority

• power supply company

• NEICIE inspector

• customer.

The minimum overload protection to an instantaneous shower has to be between 30 to 40 amps. The main reason for this is because of the unit’s

• exposure to water

• voltage rating

• Amperage

• kW rating

The item of equipment shown is used for testing

• earth continuity

• Polarity

• safe isolation

• insulation resistance.

A polarity test is carried out in order to ensure that

• there is no current leakage to earth

• conductors are not crossed

• the electrical system is safely isolated

• the insulation of conductors is satisfactory

On an insulation resistance test, the minimum reading between live conductors on a single phase system, in megohms (MΩ), when applying 500V is

• 0.15

• 0.25

• 0.50

• 1.00

Which one of the following types of test would be conducted to ensure that in the event of an electrical fault the current would be leaked to earth, automatically disconnecting the supply?

• Polarity.

• Insulation resistance.

• Reverse current.

• Earth continuity