There must be a bleeder resistor (across the X caps) to make the AC input
pins safe to touch once the supply is removed from the cabinet.
If there are exposed voltage or energy hazards with the supply removed,
there must be a restriction such that only trained personnel are instructed
to do
The important thing to note is that a good amount of the utility load is not
constant power. It is light bulbs, toasters, coffeemakers, hairdryers and
electric heaters and so on. So lowering the voltage 10 % is the first step -
the so-called brown-outs. Power is a square function, so the new
Typically, the range switch on the cost-sensitive (cheap) power supplies
changes the front-end topology from conventional capacitor input to a
voltage -doubled one. Since the power load stays the same, the current
will double. But the nature of the input current to these supplies is
gulps of
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