This is used to describe the size and quantity of conductors
	in a cable.  The first number specifies the gauge.  The second
	the number of current carrying conductors in the wire - but
	remember there's usually an extra ground wire.  "14-2" means
	14 gauge, two insulated current carrying wires, plus bare ground.

	-2 wire usually has a black, white and bare ground wire.  Sometimes
	the white is red instead for 220V circuits without neutral.  In
	the latter case, the sheath is usually red too.

	-3 wire usually has a black, red, white and bare ground wire.
	Usually carrying 220V with neutral.

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