AMPS CALCULATION

[BARRYG]

I am installing fibre optics in a bedroom ceiling shortly. Will wire the light source and new light cable (for a new light switch) into the light circuit , using a 4 terminal 20 amp junction box. Am I right to assume that if the lightsource is 50 watts and the mains voltage is 250 volts , there will be 200 milliamps used and well below the 6 amp light circuit it will be wired into ? Also using t & earth 1.5mm cable .
Thanks for any help out there.

Barryg

 

[ban-all-sheds]

Actually it's 240V and 208mA, but the answer to that is still "yes".

Is this your plan for the wiring

[code:1]

---E---[]--------
LIGHTING \ LIGHTING
\ CIRCUIT
CIRCUIT---N---[]---+----OUT
\ |
IN \+--------------------\
| \
---L---[]---+---- LIGHT
\ | SOURCE
| | /
[]-+-+--------------------/
^ | |
| | |
| | |
| | |
| v |
'''''''
' SW '
' '
'''''''

[] JB terminal
+ Wires crossing, NOT joined

[/code:1]

Don't forget to turn off the power first, use earth sleeving where appropriate and with the T&E cable that goes to the switch, use red for the live feed, and put red sleeving or red tape on the black switched conductor.

 

[breezer]

technically its 230v (european thing)

Barry G sounds interseting, can i ask where you are getting the fibre optics from?

 

[securespark]

breezer don't know which bit of the world you are from, but if you aint familiar with f.o. , then you must be in outer hebrides...........

Only kidding.

Denmans sell f.o. lighting kits and also ABM in Croydon......
amongst others

 

[breezer]

i was considering something like

but its nearly £800, but it does colour change

 

[ban-all-sheds]

technically its 230v (european thing)

Whenever I've measured mine it's always been 240 or more.

I thought that the situation was that although the UK has signed up to HD472 (i.e. 230 +10/-6%), the reality was that as our old 240V +/- 6% fitted into that range (apart from the very extremity of the +6%), the supply companies haven't reduced their nominal voltage from 240 to 230 because of the 8% drop in revenue that would ensue.

 

[BARRYG]

Thanks to everyone for all the replies.

WIRING FIBRE OPTIC LIGHT SOURCE AND NEW SWITCH INTO LIGHT CIRCUIT IN LOFT USING 1.5m t&e and 20amp junction box.

LIN = LIGHT IN
LOUT = LIGHT OUT
LS = LIGHT SOURCE
SW = SWITCH

Cable and junction box wiring (i think this right , have right info somewhere)
Neutral from LS , LIN & LOUT into 1 terminal
Live from LIN , LOUT & SW into 1 terminal
Live from LS and neutral (black wire becomes switched live) from SW into 1 terminal
Earth from LIN, LOUT, LS and SW into 1 terminal

Will replace single gang light switch in bedroom with double gang (1 switch for current light in ceiling , 1 switch for new fibre optic lights)

Bought fibre optic kits from a company called starceilings they are here

 

[securespark]

If you are replacing switch, you will need to run another conductor in for the second switch, but I guess you have twigged this already........

 

[breezer]

Thanks BARRYG i will have a good read later