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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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110v transformer wiring
I have been playing around with a Tool Transformer for 110v power tools.
Using an earth leak tester I found that the earth pin on the 240 side gave a reading on earth, neutral and live on the 110v side. I assume this is the centre tapped earth, but am curious to know why this is so. TIA -- Regards David G (remove r u n) |
#2
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110v transformer wiring
"David G" notreallyhere@sure wrote in message . com... I have been playing around with a Tool Transformer for 110v power tools. Using an earth leak tester I found that the earth pin on the 240 side gave a reading on earth, neutral and live on the 110v side. I assume this is the centre tapped earth, but am curious to know why this is so. TIA -- Regards David G So that if you get a shock between one of the wires and earth you only end up with 55v going through you. |
#3
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110v transformer wiring
on 28/04/2006, David G supposed :
I have been playing around with a Tool Transformer for 110v power tools. Using an earth leak tester I found that the earth pin on the 240 side gave a reading on earth, neutral and live on the 110v side. I assume this is the centre tapped earth, but am curious to know why this is so. TIA That is because the centre tap of the 110v side is earthed to the 240v earth :-) The idea is that there should be a maximum voltage to earth of 55v, which is half of the 110v voltage of the secondary winding. -- Regards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk |
#4
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110v transformer wiring
Harry Bloomfield wrote:
That is because the centre tap of the 110v side is earthed to the 240v earth :-) The idea is that there should be a maximum voltage to earth of 55v, which is half of the 110v voltage of the secondary winding. Thanks for the replies - that gives me a better understanding of the workings. I meant to reply earlier but have been unable to see the replies until now - my fault with my setup. Regards David |
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