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With a sub panel you have to run a neutral and a ground if you are running 120/240v power on the sub.
If it's a 240v only you don't have to run a neutral.
The reason why the neutral ground bond is broken in the sub panel is so the ground doesn't carry current.
If the neutral and ground are bonded at the sub then the ground acts like a neutral. Then you won't know there is a neutral or broken ground fault until you lose both.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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