LED External Wall Lights

[atm]

just moved in and purchased 3 230v IP44 LED lights for the back of house.

Instructions are very basic.. Main points are

"do not hook up to lighting circuit"
"must be on a switched fuse spur"

there is already a wall light outside which is coming off. Is quite old and is hooked directly to the CU on its own 6amp mcb. 1.5mm from CU to single gang switch then goes to light.

1, can i use the 6amp mcb?
2, what fuse needs to go in spur? doesn't say in instructions
3, do i need to up the cable rating to 2.5mm t&e?

any assistance would be most appreciated thanks.

 

[Chri5]

1- Yes
2- 3A ??
3- 1.0 or 1.5 would do, but only if cable is run inside, for outside rubber cable flex, artic, hi-tuf would be more in keeping with the enviromental conditions (wet, frost, hot, cold, UV)

You need to confirm the load on the LED's to confirm Q2

Say each light is rated at 20w x 3 = 60w 60w/ 230v = approx 0.27A

 

[atm]

1- Yes
2- 3A ??
3- 1.0 or 1.5 would do, but only if cable is run inside, for outside rubber cable flex, artic, hi-tuf would be more in keeping with the enviromental conditions (wet, frost, hot, cold, UV)

You need to confirm the load on the LED's to confirm Q2

Say each light is rated at 20w x 3 = 60w 60w/ 230v = approx 0.27A

box and instructions make NO reference to lamp wattage.. just says "mains voltage 12 white LEDs" so basically try the 3amp spur and see how i get on.

chirs quick question.. why is the 6amp mcb suitable?

 

[Chri5]

The 6A MCB is the lowest rated MCB available, since you will add a fspur of 3A there is further protection along the circuit.

12 x LEDs in each light ?

Work to 3w per LED- 3w x (3 units x 12) = 108w or under 0.5A total circuit load.

 

[breezer]

I bet they are not 3w led lights, they are expensive

atm any chance of a link for the lights? (in the mean tme a 3A fuse will be fine)

 

[atm]

I bet they are not 3w led lights, they are expensive

atm any chance of a link for the lights? (in the mean tme a 3A fuse will be fine)

each LED is 0.05w... 0..05 x 12 is 0.60watt per light..three lights is a load of 1.8amps by my rekoning.. so 6 a mcb with 1.5mm t&e upto 3amp spur then 1.5mm t&e radial along the 3 lights..

how that sound and appreciate the help.

 

[electronicsuk]

each LED is 0.05w... 0..05 x 12 is 0.60watt per light..three lights is a load of 1.8amps by my rekoning..

I'd like to see your calculations for that...
P/V = I
P = 0.6w x 3 = 1.8w
V = 230v
1.8 / 230 = 0.0078A = 7.8mA!

However, I'm with you on your assumptions as to the wattage of each fitting. Standard individual 3 or 5mm LEDs really do not consume a lot of power.

 

[sparkyspike]

The 6A MCB is the lowest rated MCB available

1A is the lowest MCB available. You can also get 2A and 4A MCBs.

 

[Chri5]

The 6A MCB is the lowest rated MCB available

1A is the lowest MCB available. You can also get 2A and 4A MCBs.

"generally" available Wylex start at 6A, Hager at 6A and MK start at 3A

Who make the 1A, 2A and 4A ones you mention ???

 

[ColJack]

siemens at least.. they're generally for control panels, and I'm sure we have some 0.5A one somewhere..

and merlin gerin apparently.. http://cgi.ebay.co.uk/MERLIN-GERIN-...26215QQcmdZViewItemQQ_trksidZp1742.m153.l1262
also, klockner moller, Bill Talisman, protek, lrgrand, hager and so on..

 

[sparkyspike]

MEM, GE, Hager, Merlin and Contactum all make them. They're available in B, C, D, 6kA, 10kA. You will probably have to order them as they're not normally on the shelf.

 

[RF Lighting]

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• RF Lighting
• 1 Jul 2008
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