[stumpringo]

installed RV 30 amp box ... volt meter is only showing 109 volts...how do I determine the cause and rectify it

 

[Techy]

how far from the panel and what wire gauge did you run

 

[a7ecorsair]

Is that 109 Volts with the RV cable unplugged? What does the power measure in your breaker box where you are feeding this RV box.