Led panels

[Gazzb91]

Chaps, this guy has 16 x 40w led panels in his office. Now he wants them all switching by one occupancy sensor. But I'm concerned about the start up current, is there a sensor available that will cope? Or one that anyone can recommend. Cheers gents

 

[Leesparkykent]

use a relay/contactor and use the pir to trigger the coil.

 

[westward10]

use a relay/contactor and use the pir to trigger the coil.

Precisely.

 

[The Ghost]

I have fitted CP microwave sensors In loads of places and had the CP (CP products) chap come down to plan it out. There is no need for relay. The sensor does it fine. Although the highest amount I have fitted is eight. If you think about the original switch is rated to 10A (usually in these circuits) and the load is only 3A. EBDSPIR carries 6-8 A. I realise if you enquire of the manufacturer the initial draw is something insane on each LED panel This would technically be too much for even the MCB but the real world wins again Some of the panels have been in for 5 years no problems.In practice it has not been a problem. We fit JCC skytiles and they come with 7 year guarantee and the light quality is superb. Oh and I would say I use the IET Code of Practice book on LED.

 

[The Ghost]

Must be a big room you may have to daisy chain a couple together or a few.

 

[telectrix]

job i did last year 20 40W panels on a 10A B type. never tripped.

 

[westward10]

Says he is only using a single sensor, don't know why.

 

[Leesparkykent]

job i did last year 20 40W panels on a 10A B type. never tripped.

On one switch out of interest?

 

[Gazzb91]

Single sensor because there is one entrance to the room. It's a large room in an office block used for storage only. They walk in, walk back out. No need for multiple sensors. They're currently on a 1g switch, and the c10 mcbs holds out fine. They simply want a sensor in its place because people can't seem to get their head around the use of a switch. The contactor was always an option but I want to see if I can get a sensor to save faffing about first

 

[The Ghost]

You can replace the switch with a no neutral sensor type. As for the inrush current the only problem is will the mcb trip oh and the photocell in the sensor can it take it. As it occurs for 1ms it is not usually a problem. It would have shown up already if it is. But then you can always go for a type c mcb instead. Theoretically you would have a peak of 800 A for 1ms. However you cannot stack up the inrush current because it depends on the impedance of the circuit, length etc. as to what LED panel is drawing within the cycle. Apparently 90 degrees is the most vulnerable part of the cycle. We cannot calculate the inrush current without some very sophisticated equipment so we have to look to the manufacturer for guidance. JCC do say you may have to upgrade (to type C) your mcb.

 

[Leesparkykent]

Single sensor because there is one entrance to the room. It's a large room in an office block used for storage only. They walk in, walk back out. No need for multiple sensors. They're currently on a 1g switch, and the c10 mcbs holds out fine. They simply want a sensor in its place because people can't seem to get their head around the use of a switch. The contactor was always an option but I want to see if I can get a sensor to save faffing about first

What about replacing the switch with a time lag switch. something similar to this Time Delay Switch | Time Delay and Time Lag Switches | green-i - http://www.cpelectronics.co.uk/green-i/products/timers/time-delay-switch