How a Heater Killed An Extension Lead
We've all heard the common refrain that electric heaters should not be plugged into extension leads. I'm fairly sure, too, that most of us will have ignored that advice at least once.
We "temporarily" plugged our living room heater into one.
We didn't do so blindly and first checked a number of things: The lead is clearly marked as being good for 13A
at 250v. The heater is rated to 2kW
so at 230v should draw 8.69A
. The lead was in good condition - the heater's plug sat tightly in it's socket - and there was nothing else even relatively high load plugged into the lead (and wouldn't be).
So, it seemed like it should be fine. But, of course, I wouldn't be writing this post if that had been the case.
The other day, the heater dropped offline (yep, it had to be that heater). When I went downstairs to check, it was completely off - the display wasn't on and it didn't respond to its button etc.
The lights on the extension lead were on, except for the one corresponding to the heater's socket. Had someone turned it off?
I went to toggle the switch, but it wouldn't move. When I went to unplug the heater, the switch lit up a little accompanied by a crackling sound indicating that electricity was arcing inside.
The lead, obviously, needed to be taken out of use. But, I wanted to see how badly it had failed and so, rather than binning it, took it apart.