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Tractor Talk Discussion Forum

Re: Solid vs stranded wire

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dr sportster

10-15-2013 19:10:14

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In a comparision of ampacity of large condutors [which are all stranded] a 500 kcmil cable can carry 430 amps yet a welding cable 500 kcmil can carry 695 amps. Cost is way higher but when you need the flexibilty for something like tapping conductors into an old box stuffed with wires the flexibility becomes a factor .Welding cable can be layed into the box where 500s of normal cable would not allow the cover to go back on . For a trough pull box etc. sometimes you have to get the expensive welding cable to close things up. You will have bloody knuckles trying to work with normal cable forget about solid.For something like generator lead to temp power up a building welding cable is the only way you can wrap them up like a small cord and place them back in the generator . For pools solid #8 must be used to equalize the potential of any metal part larger than 4 square inches. But does not have to be run back to the panel.Stranded will fail inspection. Solid conductors are usually only going to be 10s and 12 awg sizes[excepting swimming pool 8awg s]. Years ago solid was speced out more but I have not seen that for a good while. Solid has more chance of being nicked on any sharp edge when pulling a bunch through pipe. Like I said all large conductors are stranded.
Unless you order solid the supply house is sending stranded. I have not seen solid larger than #8 that I can remmeber offhand. To use anything but stranded on a vehicle is probably bad practice.

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greg k

10-16-2013 07:06:31

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 Re: Solid vs stranded wire in reply to dr sportster, 10-15-2013 19:10:14  
Only exception I can think of is solid bare #4 for grounding purposes. Somebody else can probably think of more

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Stick welding

10-15-2013 22:27:46

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 Re: Solid vs stranded wire in reply to dr sportster, 10-15-2013 19:10:14  
If you want the best battery cables or booster cables, you use welding cable that it is made up of many more individual smaller solid wires. Similar to wire rope where more strands is stronger.

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dr sportster

10-16-2013 06:12:04

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 Re: Solid vs stranded wire in reply to Stick welding, 10-15-2013 22:27:46  
That is also what is used to come out of large battery back up cabinets to go over to main gear. It is much easier to lay in a cable tray and land than the stiff normal wire. Then there is lightning protection cable which is braided way differently.Must be a theory about lightning traveling down it.

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