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Fitting
out a wood frame building for wiring is relatively simple
in new construction, as all the framing members are exposed.
In a pre-existing building, fishing wires, exposing sections
of wall framing for pulling cable, and surface mounting wire
runs are no different in today's workplace than they were
more than 100 years ago.
Before 1920, the most accepted method of wiring was "Knob
and Tube", requiring two runs of a fabric or rubber-coated
copper wire. This method used tubular porcelain fixtures to
protect the wire as it passed through framing members. For
surface mounting, a two-part device was used to grip the wire
and keep it away from any surface.
This system, although safe if unaltered, has made the resale
of older structures difficult if this type of wiring is discovered.
Almost all of today's insurance companies will re-examine
their coverage with the disclosure that this type of installation
is present. Strangely, the current electrical code still allows
it in special situations.
By
now, readers may be saying, "Get on with it!" And
what's the connection? The boring device or brace shown was
developed specifically for drilling holes in joists and studs,
or in any other circumstance where a conventional brace or
hand drill was not suitable.
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| Boring holes with adjustable arm brace. |
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