GMJ 6189 electrical quiz

Which device contains a bi-metal device?

• MCB EN 60898

• RCD

• BS 88

• Fuse

Insulation test to a 230v circuit would require a test voltage of

• 230 v

• 415 v

• 500 v (new installs with no load)

• 1000v

Which is NOT part of an inspection?

• All equipment is to British Standard

• No signs of damage

• Equipment is suitable

• All parts are correctly selected

• Phase rotation test

The purpose of an earth is

• Increase disconnection time

• Decrease disconnection time

• Provide earth fault loop impedance (path/earth)

An existing system is to be extended, the correct procedure would be to

• Continue with the installation

• Re-calculate the load and compare

• Re-calculate the load ensuring diversity and compare

You suspect an open circuit to a thermostat connected to a motorised valve. You would check the cable with a;

• Low resistance ohmmeter

• Volt meter

• Insulation tester

• Neon screw driver

The cable that supplies a zone valve connected to the wiring centre is

• 4 core (I think, L, N Switched L and earth?)

• 5 core

• 6 core

• 7 core

The function of an auxiliary switch in a motorised valve is

• To operate system components

• To protect against over current

• To protect against earth leakage

• To prevent over heating

Which test is not recorded on a minor works certificate?

• Positive fault current at the supply origin

• Total earth fault loop impedance value

• Insulation resistance value

• Polarity