For applications that need even more flexibility, even more strands are used ( welding cables are the usual example, but also any application that needs to move wire in tight areas ).
2.
Direct current is used, and a heavy duty isolation switch is installed in the welding cable at the surface control position, so that the welding current can be disconnected when not in use.
3.
Also, apropos a topic you and I were discussing quite some time ago, folks who build real neighborhood-thumping car stereos often put large " ultracapacitors " in parallel with their car batteries ( or at least, near the welding cables with which they feed their power amplifiers ).
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