- Major Systems > - The Electrical Rough-In The Electrical
Rough-In - Photo: Flickr The plans, as usual, guide the work.
For the electrician, there'll be a separate drawing that will
map out the location of every switch, plug receptacle, and light
fixture. Special-purpose circuits such as for an electric range
in a kitchen, a room-size air conditioner in a bedroom, a
clothes dryer, or other appliances will also be indicated. The
size of the lines required will be specified. For light
fixtures, 15 amperes is usually adequate; for plugs, 20 amps is
preferable. (In simple terms, amperes or amps are a measure of
the power or flow of electricity; the number of volts identifies
the rate; and watts are the power actually used). An air
conditioner might require 30 amperes at 240 volts (rather than
the 120 volts needed for powering your toaster or bedside lamp).
An electric wall oven might need 50 amps at a voltage of 240.
Most major devices (like a water pump, hot water heater,
furnace, range, or refrigerator) have s