There are no standard heights required for outside receptacles. Usually they are in accordance with the equipment that they are to supply voltage for. In areas that receive a high snow level they are positioned at a height so as to be accessible year round.
In the US a general purpose receptacle outlet would be 120 volts; England 240 volts, France 115 volts, Libya 127 volts, Okinawa 100 volts, Tanzania 230 volts . . .; all depends on where your house is.
Because it is a 220 volt outlet instead of a 120 volt outlet. Now, if this is a standard 120 volt outlet that is reading 209 volts then someone has made a mistake in the wiring. You need to call an electrician to straighten this out.
10 amps 250 volts or 16 amps 250 volts.
A standard two prong outlet in the US carries 110 volts. Actual voltage in your area may vary from below 100 to 140 volts, but these extremes are unusual. Most of the rest of the Americas (North and South) uses the same standard. In Europe, the standard voltage in a "two prong outlet" is 220 to 240 volts. In the US, this voltage is reserved almost exclusively for use by stoves and ovens in the home.
It's an outlet wired for dryers, stoves and some large heaters. In about 50% of the world 230 Volts is the standard household supply used for all appliances. In the other half of the world it is 110 Volts.
In North America there are two standard voltages for the wiring of homes, 120/240 volts.
Nominally 120 Volts.
A spray tan machine needs an outlet with a ground so that electrocution does not occur. The outlet must supply at least 110 volts. A standard outlet with a ground installed should suffice.
Nominal ( Means Ideal or what we tell you it should be )120 volts AC Any voltage at or over 105 volts will make everything operate normally Expect to see 110 volts to 117 volts in your home depending on what you are running.
Someone has wired 240 volts into your 120 volt outlet. If you have 240 volts you need a specially configured outlet so that a standard 120 volt plug cannot be inserted. If you have this situation you would see 120 volts to ground and not neutral. Sometimes if you don't look carefully an outlet will look like the standard 120 volt variety but it isn't. One of the slots is horizontal and not vertical although there may be a small vertical split. 240 volts doesn't just magically appear. What you are describing is on purpose. If it really is 120 volt receptacle you need an electrician to put in the proper receptacle or re-wire the circuit.
Any where from 110 volts to 130 volts alternating current is available from a 110 VAC outlet.
In North America 120 volts, in the UK and Europe 240 volts.