-Enclosure & Wiring Details-
I recommend a sturdy metal enclosure, with lots of space inside,
and the use of fiberglass circuit board/perfboard to wire
everything up.Keep in mind that the metal enclosure should have
space between it and electrical components of at least an inch,
and that the coils can have up to a 40 degree C temperature rise
above ambient.They should be mounted so that they are stood off
the board by their full lead length, and wiring brought to these
lead tips.
If a power ON/OFF switch is desired, use a heavy duty one rated for
at least 15 amps, and 240VAC.Indicators such as LED's and
especially neon indicators are not recommended.If a power ON
indicator is absolutely needed, socket in a 7 watt night light bulb
on the output side.Not only will this be a benign indicator, it
will actually help damp the output of the filter a little.Ideally,
a 100 watt bulb will be connected across the output at all times to
load and damp the circuit, but I do not recommend placing such
wattage inside the metal box.A load resistor of suitable wattage
and resistance can be used, remember that most of these require
heatsinking for such power dissipation levels.Appropriate values
are 120 ohms at 150 watts or 150 ohms at 100 watts or higher.This
size of resistor is not cheap, and the 100 W light bulb/lamp in a
lamp fixture is a much more economical method of achieving the loading.
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