Does an extractor fan need an isolator switch?

Answer: The provision of isolating devices for extract fans in bathrooms or shower rooms is not specifically addressed in BS 7671. A fan isolator mounted adjacent to the fan would fulfill the requirement for switching off for mechanical maintenance. The switch need not necessarily interrupt the neutral conductor.

Are fan isolators required?

The requirement to have an isolator is sadly flouted in them there parts; one is required (1.) Since there is a motor (with fan), which requires to be isolated (and preferably locked off), to enable safe working on mechanical parts, (albeit that it is of the Mickey Mouse variety); and (2.)

Can I put fan isolator in loft?

Unless the isolator is not liable to be switched on when working on fan then it should be in the loft with the fan.

Why does a fan need an isolator?

The idea of a fan isolator is so that the fan cannot become live accidentally during maintenance, but also functionally, so that you can switch off the fan without having to turn the lights off. There is nothing in the regs to say that the light must be isolated at the same time, as the light switch already does this.

Should an isolator switch be on or off?

As you say it’s an isolator, rather than a functional switch. It should be turned off whenever electrical work needs to be done on the shower (so not quite “never”).

Why do you need a fan isolator switch?

Who can install an isolator switch?

Any competent person can install an isolator switch, but it does require the main fuse to be pulled in some cases, unless the meter is one of the few that includes a built in isolator (in which case it’s questionable as to whether it’s worth fitting a second one).

What is an isolator fan?

The idea of a fan isolator is so that the fan cannot become live accidentally during maintenance, but also functionally, so that you can switch off the fan without having to turn the lights off.

Does a bathroom extractor fan have to have an isolator?

The regulations stipulate the size of motor before an isolator is required and a bathroom fan is too small to need an isolator. However regulations also say you should follow manufacturers instructions and most say fit an isolator.

What is 3 pole fan isolator switch?

The MK Three Pole Fan Isolator provides a safe and simple method of isolating mechanical fan units and is particularly useful in bathrooms, toilets, storerooms and basements where there is little or no natural light.

When would you use an isolator switch?

Isolator switches are used for opening an electrical circuit in the no-load condition. It is not proposed to be opened while current flows through the line. Generally, these are employed on circuit breaker both the ends thus the circuit breaker repair can be done easily without any risk.