Installation Theory 2

Steel conduit connections must be tight at the point of connection from adaptable boxes in order to?

• Maintain electrical continuity

• Keep it air tight

• Prevent dust

• Protect cable insulation

Which one of the following types of conduit should be used for a flameproof/gas tight installation?

• Light gauge seam welded

• Light gauge solid drawn

• Heavy gauge solid drawn

• Flexible

The purpose of supplementary bonding is to...

• Make sure switches are connected in the line conductor

• Bring bonded parts to a common potential

• Increase earth loop impedance

• Provide a shunt path for fault currents

A polarity test is necessary to ensure that...

• Earthing is satisfactory

• Circuit functions correctly

• Motors do not run the wrong way

• Switches are connected in line conductor

The most common wiring system for a domestic electrical installation would be...

• Silicon rubber cable in PVC Conduit

• Mineral insulated metal sheathed cable

• Flat profile twin and CPC

• PVC insulated in galvanised conduit

Placing a device in a circuit to protect cables and equipment against the effect of excess currents of at least 1.25 to 2 times the normal rating is called?

• Earth fault protection

• Overcurrent protection

• Open circuit protection

• Mechanical protection

The letters PME stand for?

• Protective multiple earthing

• Protective main earthing

• Permanent main earthing

• Present main earthing

The main purpose of a BS EN 60898 circuit breaker is to ?

• Provide overcurrent protection

• Provide earth fault protection

• Provide continuity

• Provide insulation

By complying with BS 7671 regulatory requirements it ...

• Ensures the installation is neat

• Ensures the installation is safe

• Reduces installation time

• Makes installation exempt from inspection for the next 25 years

The function and purpose of an electrical installation is given in which document?

• Exploded view drawings

• A specification

• Manufacturers manuals and instructions

• Memoranda