ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Bathroom Exhaust Fans

The 3-pole isolator has become the norm here for timed fans:



MK is now making a version with a lock out provision, although from the pictures I can't quite figure out how the padlock is supposed to work:



I'm trying to think when these isolators first appeared. I think it might have been with the 15th edition (1981).