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Transformer secondary wire, not long enough?

post #1 of 5
12/3/09 at 2:42am
Thread Starter 
Sorry in advance, I know we need another transformer thread like a hole in the head, I’ve searched and cannot find the answer to my query.
I need to extend the secondary wires of a toroidal transformer by around 3 inches or so. I’m assuming this will be just a matter of soldering/insulating an extended piece of wire. I’m not 100% sure though...
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post #2 of 5
12/3/09 at 3:02am
You can solder another piece of wire to the leads and put heatshrink over the joint.

It might be overkill, but I never use an unsupported solder joint. I'd run the leads to a terminal strip or terminal points mounted to the chassis and then solder the second wire to that. It's a little more work, but I think it gives you a little extra margin of safety.
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post #3 of 5
12/3/09 at 3:12am
Thread Starter 
Quote:
Originally Posted by Uncle Erik View Post
You can solder another piece of wire to the leads and put heatshrink over the joint.

It might be overkill, but I never use an unsupported solder joint. I'd run the leads to a terminal strip or terminal points mounted to the chassis and then solder the second wire to that. It's a little more work, but I think it gives you a little extra margin of safety.
Thanks so much Erik, I never thought of a terminal strip - I have two transformers which need to be extended this will work out nicely

Cheers
John
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post #4 of 5
12/3/09 at 11:18am
You could also use a crimp ferrule to splice an additional 3-4" of wire on each secondary and heat-shrink over those joints. A tight crimp will be far less brittle than a solder joint. You could also look into Posi-Lock connectors, but that's getting pricier.
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post #5 of 5
12/7/09 at 7:49am
I find crimp connectors less reliable. If you twist the wires and aren't going to flex the joint, soldering them and covering with heatshrink tubing should be fine. Keep in mind this is assuming other proper design (regardless of how you connect them), chassis is grounded if metal and the supply has a fuse on the input.
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