12v Lights + Inductive load

Sep 11, 2004 6 Replies
A

I've wired my upstairs lights like this:



formatting link
not quite as I'm in the process of of finishing the bathroom lights.



The bathroom lights are fed by 240v - 12v transformers. The instructions for the transformers state:



"Electronic transformers, which is for resistive loads, must not be used in the same circuit as inductive loads (fluorescent lamps, discharge lamps, ventilating fans, etc). When switching inductive loads, spikesof several thousand volts may result, causing damage to the transformer. Seperate load circuits must always be provided."



My question is this. Do I need to re-jig the cicruit so that the loft and bathroom lights are on different circuits?



Cheers



Andy


Vote
Twitter Facebook LinkedIn
F

In article , Andy Kelly writes

I think the above means that they should not share the same switched circuit ie. the circuit after the switch. I think the main inductive transient will be at switch off, at which point the inductive (fluorescent) circuit will be isolated from your vulnerable dimmer circuits, you shouldn't need to redesign.

If in doubt you could fit a transient voltage suppressors at the 'transformer' terminals, cost will prob be about a quid each. Let me know if you fancy this option & I'll suggest some part nos/suppliers.

HTH

Vote
Twitter Facebook LinkedIn
J

If they are that senstive I wounder if they have realy been designed for the purpouse they are intended!

Vote
Twitter Facebook LinkedIn
D
O

The importent detail there is, load circuit. It means not having inductive and resitive loads on the same circuit ie same wires.

Dave

Vote
Twitter Facebook LinkedIn
A

I'll play safe and move re-jig the wiring.

Thanks

Vote
Twitter Facebook LinkedIn
D

Looking at your diagram, you are ok.

Dave

Vote
Twitter Facebook LinkedIn
T

Get a toroid instead Andy, and save all the worry. No interference to your radio, no blowing up, just as long as you don't strap a dimmer on em ...

Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required