Start with the thermostats, because they control the heat
Switch everything off and let it cool before you handle anything. Then confirm that every heat source in the vivarium — mat, ceramic emitter, basking lamp, radiant panel — runs through a thermostat rather than straight into the wall. An uncontrolled heat source is the single biggest fire and burn risk in reptile keeping, so a heater with no thermostat is a fail on the spot. Check each thermostat's probe is still fixed where it belongs, at the height and place the animal actually uses, and has not been knocked loose by cleaning or by the animal itself. A probe dangling in mid-air reads the room instead of the basking spot, and the thermostat will happily overheat the enclosure trying to compensate.
Trace every cable from plug to fitting
Now follow each cable along its full run with your eyes and fingers. You are looking for nicks in the insulation, crushed or flattened sections where a vivarium door or heavy decor has pressed down, brittle or discoloured patches near hot fittings, and any point where cable rests directly against a lamp or emitter. Check the plugs too: cracked casings, loose pins and scorch marks around the socket all mean that item comes out of service today. Count your adapters honestly. Heat equipment should never run through chains of multi-way adapters stacked one into another, and extension reels should be fully unwound if used at all, because a coiled reel under load builds heat of its own.
Check the hot ends: holders, guards and clearances
Basking lamps and ceramic emitters belong in ceramic or porcelain holders rated for the heat, never in plastic fittings that soften and deform over time. Confirm emitters and lamps have guards or sit far enough from branches, substrate and the animal that nothing can rest against them, and check that no loose substrate, shed skin or dust has drifted into the fitting or built up on top of a warm lamp housing. Look for scorch marks or a baked smell on nearby wood and decor: those are the enclosure telling you a clearance is too tight or a lamp is running hotter than it should.
Finish with the room, then make the check a habit
Plug everything back in, run the setup for an hour, and feel each plug and socket: slight warmth is ordinary, real heat is a warning to stop and replace. Test the smoke alarm in the reptile room while you are standing there, and keep a clear path to the sockets so you can kill the power fast if you ever smell burning. Then make sure this sweep is not a one-off you forget by next season. Setting the electrics check as a recurring duty in KinsLe's Care Teams assigns it to whoever looks after the vivarium, and each completed check is marked with a timestamp so the record shows it actually happened.