I don't think that plugwash's diagram had anything to do with the manufacturer wanting a double pole switch (they're more likely have called for a '3-pole isolator', anyway) - I think the DP switch is all about getting both the L and S/L to the fan protected by a 3A FCU (which the manufacturer probably also called for!) without having to fiddle with (insert the FCU in) the supply feed to the light.So the manufacturer advised a double pole switch? I don't think plugwash's diagram was quite what they had in mind.
As as already been said, that's a bit odd since their diagram includes only a single-pole switch! 'Double-pole switch' usually implies switching of both live/line and neutral. However, with a timer fan there are two lives (L and S/L) as well as neutral, so manufacturers usually specify a 3-pole switch/isolator.A double pole switch is what they have asked for, do you know a better way other than plugwash drawing?
Quite so:The single pole switch in the diagram is the light switch and they haven't shown a double pole switch !!!
... and, unless one converts the light switch to a DP one (per plugwash) one would need a 3-pole switch/isolator to achieve 'all-pole' isolation of the fan.As as already been said, that's a bit odd since their diagram includes only a single-pole switch!
A double pole switch is what they have asked for, do you know a better way other than plugwash drawing?
I doubt that's what they meant - I've never seen a fan's MIs suggest such an arrangement. I wonder if the OP is reading the right MI, or the right part of the MI, or perhaps misunderstanding something? When they mention isolation, IME the MIs always call for DP isolation (L & N) of non-timer fans and 3-pole isolation (L, S/L and N) of timer fans - in both cases, they mean 'all-pole isolation' (including neutral).It's hard to know what exactly they had in mind as their diagram didn't actually include a DP switch but the only sensible arrangement of DP isolation would be to isolate line and switched line.
I don't think you can get away from it - as above, I've never seen MIs for a fan which specify an isolator without requiring it to isolate N as well as L(s) (2-pole for non-timer, 3-pole for timer models).* Please let's not get started on the do we need to isolate the neutral conductor debate.
Hmmmm - it looks as if they have copies the bit about a "double pole switch with 3mm contact separation" from some manufacturer's instructions for a non-timer fan, and have not noticed that manufacturer's of fans with timers almost invariable call for a 3-pole switch/isolator with 3mm contact separation! What make (and nationality) is this fan?pic of instruction
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