Electrical Safety Checks

The 240V Test checks boilers for mains power supply to the boiler terminal strip.

This test will ascertain the correct polarity between L and N although, some boilers will operate unaffected by reversed polarity. Connect boiler to power supply via 3 pin plug top or inserting 3 amp fuse into switch Ensure boiler is on but with...

Resistance to earth: (dead test) This test confirms the integrity (resistance) of the insulation between L (Live) and E (Earth) on the boiler terminal strip or plug top pins (Black lead firstly to Earth pin and red lead secondly to Live pin). Check...

Short circuit: (dead test) This test will ascertain the integrity of the internal resistance of the boiler and should read no resistance/infinity between L and N on the 3 amp fused plug top pins. Set multimeter on ohms scale for resistance readings...

Mains voltage test: (dead test) This test isolates the power supply serving the boiler, so as safe, further testing can be continued, without the risk from stray electrical currents causing a shock. Electrically isolate power supply at fused spur...

The Earth Continuity Test will ascertain whether the earth continuity between the earth supply to the boiler and the internal component earth connections and the metal casing of the boiler is earthed correctly.