Thanks Sparky.
Our IEE Regs. always seem a bit vague to me when it comes to mobile homes (or "caravans" in British terminology).
The section on caravans specifies that where twin & earth (Romex) is run along chassis members there must be an insulating material between them. They also specify that the main earth terminal at the intake be insulated from the chassis, which tends to suggest that they would like the body completely separated from the grounding system.
This seems to be totally at odds with the regs. in the general section on earthing which state that all extraneous metalwork must be bonded to the main earth bar.
The confusing thing about the caravan section is that when it comes to a bath or shower compartment, they switch to "bond everythng" mode, which means that the whole body is likely to be grounded indirectly via this bonding anyway.
See, it's not just the NEC which can be vague...
