Receptacles, switches, lamps and low-voltage circuits — a thermostat, a doorbell, landscape lighting — together with the tests that show whether a fault is in the device or in the circuit behind it. Everything here stops at the last device on a circuit that already exists.
Common failure modes
- A device blamed for a fault that is in the circuit behind it
- A GFCI or RCD that has never been tested and no longer trips
- Thermostat wires pulled off and not labelled before removal
- A low-voltage transformer loaded past its rating
- A light fitting replaced when only the lamp had failed
Procedures
No procedure is published in this section yet. New procedures are added as their specifications can be traced to a manufacturer or government source.
Where this stops
The service panel, the meter, any new or extended circuit, and any work that needs the supply isolated at the panel are never covered. A page on those topics gives you the diagnostic, tells you what to ask a licensed electrician, and stops there.