Electrical Wiring in the Home/Power at light

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Question
Hi hope you can help i installed a small pull switch on a cfl light fitting fed from a photocell.When i put my tester to the incoming side it read 220 volts it should read zero in the daytime to prove my point i connected a small globe to the supply and it came on however the cfl fitting did not come on, that night the light did come on i am stumped as to why there is 220v everything is working fine any advice you could give give would be appreciated.
Kind regards
Larry

Answer
You can't just put a tester to one point and get a voltage reading. Voltage is the difference in potential between two points. What two points give you a voltage difference of 220 volts? South Africa uses the European model, probably based on a 230/400 volt WYE.

Also, be aware that if you are trying to learn electricity by reading info from the USA that we use a different voltage gradient in our residential distribution system. We also use a single phase distribution model to power residences.

Why would it read zero in the daytime?
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Electrical Wiring in the Home

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Robert Wilber

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Licensed Philadelphia electrician serving Delaware, Chester, Montgomery and Philadelphia County in Pennsylvania. I install and repair residential, commercial and industrial wiring and lighting. Troubleshooting and repair of problems that stump other people is my favorite. I am willing to help people figure out why things don`t work. I understand motor controls, transformers and machine wiring. I do not teach basics to novices or do free design work.

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Experience in the area I have 44 years experience in residential, commercial and industrial electrical construction and repair, 480 volts and below. This is not to be confused with one week repeated two thousand times.

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44 years experience in residential, commercial and industrial electrical construction and repair

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