Bathroom Fan Isolation - 2/3-pole

Discussion in 'Electricians' Talk' started by Jimbo, Jul 25, 2021.

  1. Jimbo

    Jimbo Screwfix Select

    When fitting inline fans with external run-on timers (DIN-rail mounted type timer), is a 2-pole isolator sufficient?

    Though fan isolator switches are obviously 3-pole my understanding is that the regs don't (or maybe didn't) actually require switching the neutral.

    Reason for asking: to fit the timer and isolator in a Wylex 3-module box. Could use a 2-pole 3A MCB or just a regular 63A main switch for it then.
  2. nigel willson

    nigel willson Screwfix Select

    Always switch the nuetral as well you can use a 3 pole switch to switch 2 ploes
  3. Jimbo

    Jimbo Screwfix Select

    Thanks, the question was really whether to switch the neutral. The timer will have live and switched live, as well as neutral.

    Is there any requirement to switch the neutral?
  4. Bob Rathbone

    Bob Rathbone Screwfix Select

    Isolating the neutral conductor is required for electrical maintenance, when the lid is removed and live parts exposed to touch. True isolation from the supply cannot be achieved without breaking all live conductors (the neutral is classed as a live conductor).It is also a requirement for installations in an area where flammable gas or vapour may be present in normal operations, such as filling station petrol pumps.

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