code:

(A) Practical Safeguarding. The purpose of this Code is
the practicaJ safeguarding of persons and property from
hazards arising from the use of electricity. This Code is not
intended as a design specification or an instruction manual
for untrained persons.
(B) Adequacy. This Code contains provisions that are considered
necessary for safety. Compliance therewith and
proper maintenance results in an installation that is essentially
free from hazard but not necessarily efficient, convenient,
or adequate for good service or future expansion of
electrical use.
Informational Note: Hazards often occur because of overloading
of wiring systems by methods or usage not in conformity
with this Code. This occurs because initial wiring
did not provide for increases in the use of electricity. An
initial adequate installation and reasonable provisions for
system changes provide for future increases in the use of
electricity