The NEC is a model electrical code devised and published by the
	National Fire Protection Association, an insurance industry group.
	It's revised every three years.  The 1993 version has been released.
	You can buy a copy at a decent bookstore, or by calling them directly
	at 800-344-3555.  The code exists in several versions.  There's the
	full text, which is fairly incomprehensible.  There's an abridged
	edition, which has only the sections likely to apply to most houses.
	And there's the NEC Handbook, which contains the ``authorized
	commentary'' on the code, as well as the full text.  That's the
	recommended version.  Unfortunately, there's no handbook for
	the abridged edition.  And the full handbook is expensive --
	US$65 plus shipping and handling.