jimmorton wrote:

Article 90 of the NFPA page 7 para 90.2 sub para B states that ths standard does not cover installation on ships, and water craft.
Does anyone know why and if there is a standard that does apply.
This is in keeping with the structure that exists in the states.
Utilities, maritime, mining, and construction (to a degree) have distinctly separate regulatory requirements under U.S. regulations. For instance, ANSI C2 (NESC) is the rule set for utilities and has it's own associated OSHA regulations (1910.269). As a general rule, "mixing" causes all kinds of regulatory snafus. Thus it is a long standing practice that the NFPA 70 series (70 aka NEC equivalent to CEC, NFPA 70B, NFPA 70E) specifically exempt these other specialized areas. The one except that has a regulatory though not safety standard exception is that construction is distinctly different under regulatory codes but not under safety standards.
We do not by the way have a direct equivalent to M421, especially for surface mines. There are so many gaps in the MSHA (equivalent to OH&S's mining regulators) regulations that most mines adopt NEC & NFPA 70E as safety standards just to fill in the gaps that leave them open to interpretive arguments with inspectors without choosing a more restrictive consensus safety code.