tony lee wrote:
"But your (OP) comment that you shouldn't be expected to use a DVM is a cop-out IMO."
Sorry, but you are totally incorrect. A user should be able to rely on any electrical installation meeting the published standards and plug in without having to check those standards have been met. A DVM is a test meter designed to be used by qualified personnel and is not a consumer item in this situation.
Do you get your city water supply checked each time you drink water, or do you get all your fruit and vegetables measured for contamination, or check that the fuel pump is dispensing gas rather than water. No, of course you don't. A RV park owner has a contractural obligation and duty of care to ensure that all parts of the premises meet current regulations.
Your are right since you mentioned published standards. The US published standard for electric is 120 volts, For Canada the standard is 120 volts but for Mexico the standard is 127 volts.
http://www.quantumbalancing.com/worldelectricity/electricityif.htm
Figure in the variable of + or - 4 or 5 volts on every case and it turns out that Mexico is usually within it's published standards.
Low voltage is a problem if an RV park tries to run smaller cables or split too many circuits on one breaker. What many call high voltage in Mexico is within the country's published standards.
Interesting thing is that if you take an AC built to Mexico standards and run it in the US, nothing happens. But take an AC built to US standards and run it in Mexico you can plan for a short life.
