I was assuming the OP was just brining in the tails through stuffing glands, else brass glands will be OK but expensive. Don't use a steel locknut directly onto the switchfuse case; use a brass one or banjo in between.
Thanks guys. Reason being the hager switchfuse I have has one 30mm knockout top and bottom. And due to space constraints the swa must come in the bottom.
If its a suitable option then my preferred way would simply be to cut 3 smaller gland holes close to each other and put a slit between them.
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