![]() So the fan would not run for short trips to the bathroom, but would start running for longer ones. More sophisticated examples may include a "delayed start" facility where it does not start up until the light has been on for a certain length of time. It will typically start operating when the light is switched on, but then continue to run for a pre-set time after the light is turned off. Note the use of a three pole isolator is not required in this case, but is quite often convenient, since the switches are often marked as fan switches and include a lockout capability. These often cause odd behaviour with compact fluorescent, LED and other very low energy lamps). ![]() (electronic time switches often need to bleed a small amount of power through the lamp to self power. These manual switches have the advantage of needing no power themselves, and so will run with typical light switch wiring, and are compatible with all lamp types. The time lag switch will allow the fan to be manually started, but then run for a pre-set time. Options include a manual pull switch, and a Vacuum time lag switch. It can also be adapted for separate switching if required. ![]() This wiring plan will simply run the fan when the room light is on. Unlike other fan installations, it does not need a permanent live connection. It is either run from a separate on / off switch (typically a pull switch) or perhaps a delayed action switch such as a Vacuum time lag switch, or can be connected in parallel with the lamp in the room such that it comes on whenever the light is on. Normally a three core and earth cable would be used for this. This has the advantage of having all the connections required available in one place. The best place to take an electrical feed for a fan from is often a ceiling rose or junction box where the main lamp fitting is connected. So you may need to include a fused connection unit in the feed to the fan. at 3A) even when only connected to a 6A lighting circuit. Some fans may also need additional fused protection (e.g. If the isolator is not visible to the person working on the fan, then it should also allow a facility to be "locked off" to prevent someone re-enabling it while work is being carried out (many isolators now include this capability as standard). This is to allow safe cleaning and maintenance of the fan. ![]() Kitchens are no longer classed as special locations, and so follow normal wiring practice rules.įans (especially those that may be operated by automatic controls) should be fitted with an isolation switch that will interrupt all live conductors (i.e. Note also there are additional rules that apply to Bathroom electrics (and swimming pools & saunas), and these must be followed for all fan installations in these locations. This article describes the wiring schemes for a number of fan types and applications. Fans in other locations may be more commonly powered from a fused spur taken from a socket circuit. Also UK bathrooms have traditionally not included power sockets, so it is common to not have any general purpose power circuits available in the room. This is because many include a "run on" capability that is triggered by the operation of the light switch, and it is not permitted to have a device powered from two separate circuits. ![]() Extractor fans in bathrooms are frequently powered from a lighting circuit. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |