Switching ideas

[Guest125]

Peps,

So, I went to look at a job today at London Waterloo Station. They have a peak hour only link corridor that runs from the underground to the overground concourse.

Within this area there are about 250 twin 49w T5 fittings. Half of which are emergency. Now these fittings are wired with only a permanent supply. So the lights are on 24/7. There is no natural light at all.

NR want us to alter the switching arrangements so that the lights can be switched off when the corridor is closed but still maintaining the emergency feed.

Now I am thinking new single core cable (SWA or PVC/PVC) to supply all the lights with a switched feed. Then install ceiling 360 deg PIRs at suitable intervals to turn the lights on when required (via contactors etc...).

Can anyone think of a better way of achieving the same result?

 

[telectrix]

just leave it for a while, a train is bound to demolish the place sooner or later. then you can start from scratch.

 

[Guest125]

Try not to trickle info .... the more you tell us the better response we can give... you never mentioned about it maybe opened unexpectedly .... Is this corridor locked of with barrier gates... you could run a set of limits to the gates and if opened the lights will over-ride.

Someone must be in charge to open up out of hours they could just advance the timer setting?

Sorry. Again this is fine but if there was any other access (cleaners/security) then no lights.

 

[Guest125]

You could put timer in parallel with PIR's, then you could maintain it during set hours (and prolong lamp life). It would then go to PIR control outside set hours which would cover when opened unexpectedly.

This was my thinking.

 

[Guest125]

Ukesrail
why not offer an alternative view fit LED lights, with emergency on some & microwave sensor & that can dim down to 10% when not in use then no need for more cables & energy saving at same time.
Just a thought

I like it but the cost would be about £150k. No chance.

 

[TJ Anderson]

This was my thinking.

No worries boss, tell NR to send consultation fee to TJ

 

[Guest125]

No worries boss, tell NR to send consultation fee to TJ

£1.50 in the post....

 

[TJ Anderson]

£1.50 in the post....

I understood you "looked after" your lads. I'll enjoy my 500ml bottle of coke, Thanks

 

[Darkwood]

Sorry. Again this is fine but if there was any other access (cleaners/security) then no lights.

We could bat ideas back and forth but without a on-site meeting and discussions about who may need access whether they could be provided with a key switch option etc ....I just see using PIR as problematic unless we know all the circumstances...What if there is a fire will this become and exit route - this changes all the requirements etc

You need to gather all the info...ask the questions you put as scenario's here and until then there is no real solution without a operation & usage detail....so until then we are all guessing and may not have vital info.

 

[rapparee]

Id go pir myself. If the timing duration is left long enough eg for length of peak hour you are not putting any extra undue switching on the lights and you are not restricted to set times

 

[ian.settle1]

Surely they will need some sort of lighting on if they have all them cameras?

 

[Guest125]

We could bat ideas back and forth but without a on-site meeting and discussions about who may need access whether they could be provided with a key switch option etc ....I just see using PIR as problematic unless we know all the circumstances...What if there is a fire will this become and exit route - this changes all the requirements etc

You need to gather all the info...ask the questions you put as scenario's here and until then there is no real solution without a operation usage detail....so until then we are all guessing and may not have vital info.

I hear you. Switching is out of the question. To many staff, contractors to be considered. All corridors are to be used as an exit route if required.

Sometimes it is easy to miss things off when all the info is in your head. I just wanted to throw some ideas back and forth. I was not going to quote from the advice I receive on here. Lol!

 

[Guest125]

Id go pir myself. If the timing duration is left long enough eg for length of peak hour you are not putting any extra undue switching on the lights and you are not restricted to set times

As TJA said. I would twin it with a timeclock.

 

[Guest125]

Surely they will need some sort of lighting on if they have all them cameras?

Good point. I never thought of that.

 

[rapparee]

Good point. I never thought of that.

But the cameras will only need to record if somebody is there, and if they are there they will trigger the pir.

 

[Darkwood]

Right then lets get technical... those camera's look expensive.. within them or maybe with the software controlling them they may have a movement recognition system to send a signal out, this is highly reliable can be defined to certain areas and blanked where necessary, have a word with the maintenance team for the camera system - you could get the signal you require to bring the lights on without the need to wire numerous PIR's, Ive done this on a carpark where it ignore traffic on the road but will light the carpark up if any one enters the chosen grid references on the camera view.... just food for thought, think if its an option it would save a lot of pennies and get you a big tick in your brownie box! - (PS thats not an euphemism)