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Registered Member #1721
Joined: Sat Sept 27 2008, 08:44PM
Location:
Posts: 136
Hello:
Not off hand, but if not you may be better off just buying the wire on ebay if not. Better yet, just bring an ohm meter to NAPA, it should be easy enough to figure out just by looking at a stripped end? I have not used the auto wire in years, instead I buy the same HV silicon rubber insulated wire on ebay. They normaly have quite the selection.
If I need 60KV for example, and they only have 40KV, then I take a piece of the 40KV to the HW store, and I select the semi-rigid polyethylene tube which fits it the best, and slip a section of it over the wire. PE is an outstanding cheap HV insulator, close to teflon in performance except if it gets hot. If you need a softer cover tube, then vinyl works fine. If its subject to abrasion you can even add a layer of the split black cable wrap for extra protection. I have never had this fail even when I used two layers of tubing to cover some 50KV wire, and used it to "pipe" the output of a small Tesla coil which was about 100KV, in this case I needed to oil one tube to get it to go over the other.
Anything above this you will need a good EPDM rubber wire, with a semiconductor layer like X-ray cable. The problem with HF and x-ray cable is that the cable grounded braid safety covver layer makes it into a capacitor :( This can sap your power, or even zap you good if you are not careful.
Registered Member #1321
Joined: Sat Feb 16 2008, 03:22AM
Location:
Posts: 843
Just to follow up for anyone interested, there are a few vendors online selling "Packard 440" spark plug wire in small quantities, or even by the foot.
I just got 10 feet of it for $9, and it looks like fairly decent wire. It's 7mm OD silicone rubber insulated with a stranded copper conductor. I'm not sure how much copper is there, but it looks like 20 or 18 gauge. I couldn't find a voltage rating for it, but based on comparison to some 20 kv wire I have, I'd say it's good for 40 kv DC or so.
I've decided to bring the HV out of the transformer with terminals like those on an MSD 8251 ignition coil for example. The insulators will be machined from cpvc and the center conductors will be brass rod. The brass rods will be threaded to accomodate a spark plug terminal nut on the outside end.
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What kind of jacks/terminals would be best for a bobbin?