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He is talking about using a 6g copper wire to bond all components in spa. It is to additionally ground spa. I know nothing about electrical code, but hate an electrician saying I am doing work and allowing a customer to be at risk...so was hoping someone could let me know if I dont see bonding does it need to be added or is it no longer necessary?
FYI;The very simple explanation of bonding is that it is done to prevent you from being shocked/electrocuted when your left hand touches one metal component, and your right hand touches another metal component. By running a wire (bonding wire) from one metal component to another, stray electricity (from a short for example) will equalize through the wire and one metal component will NOT have a greater voltage in it than another metal component.The NEC are guidelines that may or may not be adopted by municipalities. As for any possible changes to the 2011 NEC, most municipalities are "behind the times". They (municipalities) continually update their codes, laws and relations, and can be YEARS behind the current NEC guidelines. It's the individual municipality that has the final say, regardless of what current NEC is.