Article 610.61 (NEC) talks about the need for a fourth ground conductor for overhead cranes. this rule was introduced in NEC 2005 so my question is; do older than 2005 installations that do not have the 4th conductor have to be retrofitted?
I was told that OSHA is enforcing this rule now and I don't know if they are also doing it with older crane systems.
Thanks
I was told that OSHA is enforcing this rule now and I don't know if they are also doing it with older crane systems.
Thanks
