Landlords keyswitch??

dangerousdave · 27 Nov 2004

Hey up everyone! Sorry but here's another lighting circuit question. Here goes; How would you intergrate a landlords keyswitch which would be placed adjacent to an intermediate switch in a backbox. The circuit itself is two way and intermediate, however there is a need for a landlord keyswitch in order to knock all the lights on or off depending on it's status.
I know there's info in the 'for reference' about lighting circuits however nothing about this scenario, i'm thinking that from the common of switch 1 there should be a single cable by-passing the 'strappers' connecting into the keyswitch and coming out of that into the common of switch 2!

DB - Common - Landlord - Common - light

Would the circuit work?If not please can someone let me know how it's done, preferably in a drawing unlike my lousy attempt. Thanks all!

Lectrician · 27 Nov 2004

Who is doing an AM2 then??

Just use the key switch to connect the two strappers together at the intermediate switch. This provides an override 'on'

dangerousdave · 27 Nov 2004

You are right i've got the exam very soon. Thanks for replyin as soon as you did, i've been busy practicing certain bits of the installation and revising the routine of inspecting and testing. I have been getting advice off a range of people at work and college but with regards to the question i posed earlier, i have had a few different answers. I don't want to be annoying but it is so important for me to pass as it's my career. A number of sparks have told me to take the feed to the landlord switch first and then to the 1st switch and then wire as normal so it's basically acting as an isolater for the circuit. However the override is 'on' and not 'on' 'off'.I am quite confused with this one Please can you explain to me again how to wire the landlord switch in a little more detail. I would greatly appreciate it, thanks once again.

andy · 27 Nov 2004

is the landlord switch to be a main switch (i.e if it is off the circuit cannot be switch on?)

dangerousdave · 27 Nov 2004

All the test booklet says is - "Install PVC insulated cables for two way and intermediate lighting circuit. Install key operated override "on" switch adjacent to the intermediate switch". I suppose i'l have to wait and see at the exam how they want it to work. I know if it is the main switch that the feed would go to that first. So what if it isn't the main switch?

Paul_C · 27 Nov 2004

If the master switch is to allow the lights to be forced on, no matter how the other switches are set, then you can either wire it across the commons of the existing switches, or across the travelers, whichever is more convenient to suit the physical arrangement of the wiring.

If the master switch must be able to force the lights off, then you need to wire it in series with either the feed to the first switch or the final loop to the light, again, whichever is more convenient.

andy · 27 Nov 2004

could it be that the landlord switch bypasses the other switches, so he can switch it on and it cannot be switch off by another switch (as in there are 2 switches operating the same light)

plugwash · 27 Nov 2004

they refere to it as an override on i would take this as a switch to force the lights on regardless of how the other switches are set

you would do this by connecting accross the L1 and L2 terminals ideally on the side of the intermediate that goes towards the light.

if you did it on the other side of the itnermediate it would still work but it may be possible to push the intermediate into a mid position that could cause the lights to go off even with the override switch on

Paul_C · 27 Nov 2004

Sorry, looks like you posted while I was composing a reply.

dangerousdave said:
"Install PVC insulated cables for two way and intermediate lighting circuit. Install key operated override "on" switch adjacent to the intermediate switch".

In that case, you just need to wire the keyswitch across the travelers at the intermediate switch.

dangerousdave · 27 Nov 2004

Thanks everyone for helping, however like i asked Leccy who gave me the same answer can you please describe in a bit more detail. How do you physically link the landlord switch with the strappers (travellers)? thanks

breezer · 28 Nov 2004

simple, connect one to each then to your key switch, not forgetting the earth

Lectrician · 28 Nov 2004

You deffinantly connect one side of the intermediate across the keyswitch. All my apprentices have been told to do it this way, and passed.

Also, practise your steel conduit....2 bends and 2 sets in one peice to pre-drilled holes -(actually you get a coupler if you need it).

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Landlords keyswitch??

Paul_C

Paul_C

breezer

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