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The question doesn't say what type of household electrical service is being used. White wires are not used on 50Hz 230V circuits so it is probably a fan for 60Hz 120V...

If the asker of this question already knew how to use an electrician's test meter to check which wires go to where, would he or she be asking this question here...? If you get any other answer here, you might attempt to do something you shouldn't be doing, and that may cost someone a shock, a home fire, or even their life.

<><><> Without any connection diagram or installation leaflet to explain how to connect this unit, whilst the fan unit is down on the ground and completely unconnected to anything an electrician's test meter could be used to find out which wire, if any, is a grounding wire - but, it must be said here, you should only attempt to do this if you already know how to use a test meter to measure resistance.

You would be using the test meter to find out if one of the wires is a grounding wire as it would be connected only to the metal external casing of the fan unit and to the motor's frame. (But NOT to its windings - those would be connected to the motor's hot and neutral connection wires). You would use the lowest resistance measurement setting and hold one meter probe into good electrical contact with the fan unit's metal casing. Then touch the other probe first onto the thin bare copper wire and then, separately, on the thick copper wire after removing its green end cap. If you find there is no resistance to measure - just an open circuit - then the wire you are testing is not connected to the metal casing so it is not a grounding wire.

If you have found out for sure which wire is a grounding wire then you should connect it to the bare copper - or green colored - ground wire that comes within the circuit cable from the breaker panel.

Depending on which of those two wires was the one your testing found was not a grounding wire, you then have to cover any exposed copper on that wire with insulation tape and tuck it into the ceiling connection box completely unconnected to anything. (Same applies to both of those wires if you found that neither of them was a grounding wire.) The remaining two wires are probably for hot and neutral and either one could be wired to the switched hot feed and the other one to the neutral. If the fan seems to be running ok with only a hot and a neutral wire but with no connection to ground then, if the fan unit has a metal casing, using it without a connection to ground is unsafe and in many places could even be illegal. Having said all that, if you don't have a connection diagram or installation leaflet for that fan it is probably best to just dump it as "useless old scrap" and go buy either a new one or a very good second hand one that has got an installation leaflet or at least a connection diagram! <><><> As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed and what you could safely do yourself. Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

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16y ago

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