"Looking for the space heater" is often my first check during a power quality audit in the winter - because electric space heaters are often the culprits in many power problems.
- Fuse blowing or circuit breaker tripping
- Voltage drop problems
- Overheated connections or receptacles
- Neutral-ground voltage issues
If you need a space heater, check to see if you can get a dedicated outlet or circuit to power it - so that its current draw (and resultant voltage drop) do not affect your sensitive equipment. Remember that receptacles are often daisy-chained, so the empty outlet you find to plug your heater in may still be on the same circuit. And that same "daisy chain" may also be the point of failure - connections or splices in an upstream box or receptacle may be the place where the space heater added load causes a failure.
Here at the PowerLines home office, we've installed a dedicated 15A circuit - to run the space heater in the winter, and the air conditioner in the summer.