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  1. H

    12 Volt fan nightmare!!!

    hi every one. ive recently replaced a 12volt extractor fan, it is a johnson & starley C25HPTLV model. it has an over run timer on, aswell as a humidistat built in. Problem is it never shuts off, ive fitted a lot of timed fans before, so i know the wiring is right. checked it several times. can...
  2. M

    No Volt contacts ??

    Forgive me for being clueless here but I am hearing a lot at the moment at work about no volt contacts and wiring them ! mainly for air con equipment, such as chillers pcb's and sometimes contacts for shutting down air conditioning in the event of a fire for obvious reasons from the fire panel...
  3. M

    247.9 volt in my home, 6 laptop chargers later?

    Hi im new to this forum, thanks for accepting me. can anybody help please? i have gone through 6 laptop chargers in the last 9 months, i just mesured the voltage and peak is 247.9. will a surge protector keep it at 240v ???? or is there something i can buy to keep it at 240? because the...
  4. I

    Help with 2391 question .......VOLT DROP.......

    Hi Guys, I have a past paper (March this year in fact) with a question I can not get my head round, am I mis reading it or am I just being thick, Here is the question exactly as it appears in the paper. If snyone can help me it would be much appreciated. I know 3% 6.9V for lighting and 5%...
  5. A

    100 volt line installation

    Hi everyone. I'd appreciate your advice. I have just started out as a sound system installer and have previously always installed low impedence 8ohm systems. I have now been asked to install a 100 volt line system. Are there any regulations as far as you are aware stopping me doing this...
  6. A

    110 volt vs 220 volt<<emergency,please help

    Hi guys.I want to know which 110 or 220 voltage is better.why some countries such as U.S use 110 and many others use 220?which is more safe?which is harder to produce?and which costs more? any comments and helps will be appreciated.Thanks
  7. H

    DC / 110 Volt EM lighting

    Few questions about an existing static inverter system we are upgrading. 1. Distribution has to be DP - why, where can you find reference 2. From the inverter to the existing DB no cpc has been run with the tails, to me this looks like a glaring oversight or have i missed something. 3. Testing...
  8. B

    400 Volt Single Phase Welder

    Hi everyone, A friend has bought a 400 volt single phase welder for his workshop and has asked me to install a supply and connect it up. Having not seen the welder yet and never been involved with anything like this before could anyone enlighten me as to the supply for 400 volt single phase...
  9. M

    12 Volt DC Motor and Carbon Fiber housing

    Hello all. I hope Im in the right place to ask help for a problem that I have. I am engineer and not electrician and I do not have any special knowledge on this subject. I am producing a tool which is mainly made of aluminium and plastics and Its purpose is to harvest olive trees. Low weight...
  10. B

    how to reduce 6volts dc to 3 volt dc ?

    i have a 6 volt system on a 175 cc motorcycle. I would like to know how to wire my tail light so that the LED tail light goes from 3 volts dc to 6 volts dc. (3 votls clearance 6 volts brake light) or is there a better way to do this ? thanks in advance

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