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One
rule-of-thumb states that you can run up to 10 AMPS
of current through an 18-gauge wire for up to 50 feet without an
overloading problem. Quite frankly, our recommendation would be
that if you're going to purchase extension cords for any power tool
drawing 10 AMPS or less, you should use a 14-gauge wire. WHY? Because
overloading an extension cord creates heat, which causes resistance...which,
in turn causes more heat. It's a snowballing situation that, given
the sawdusty conditions in a workshop, could lead to a fire. In
addition when an extension cord is overloaded, fuses blow more rapidly...and
that can be annoying. The few extra bucks you spend for the added
capacity will pay you back many times over in added safety and fewer
problems.
The
Shopsmith MARK V is a slightly different story. Our extension cord
recommendations for this mainstay of your shop are as follows: Up
to 25 feet, use 14-gauge cord. 25 feet to 50 feet, use 12-gauge
cord. 50 feet to 100 feet, use 10-gauge cord.
What
types of extension cords should you buy? Always purchase 3-conductor
cords with a ground. In fact, if you're using older power tools
that are not double-insulated, it would be a good idea to purchase
cords containing a built-in GFI (ground fault interruptor) circuit
for added safety. In this case, the few extra dollars you spend
could save your life.
Recoiling ceiling drop cords placed strategically around the shop
are an excellent choice because they keep your cords off the floor
and out of your way. If you must have cords running across the floor,
cover them with rubber cord protectors such as those found in office
supply stores. This will keep them from becoming badly worn and
help prevent tripping when you walk across them.
What
about joining two extension cords together? Try to avoid this if
at all possible. If your shop is wired properly with an adequate
number of outlets and strategically positioned drop cords, this
should never be necessary.
In
Closing
Safe electrical practices in the workshop are a matter of common
sense. If your shop is properly wired and you use extension cords
with discretion, you should have no problems. Remember...it's a
lot better to plan your electrical requirements carefully than to
zap yourself while you're working with your tools...or,
worse yet, to have to call the fire department in the event of a
dangerous electrical fault or overload.
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