If the CB on the gen panel is a double throw one, that means it can select
to feed the kitchen from the mains OR the gen, that doesn't mean it hasn't a
magnetic and thermal trip, that's why its tripping. If its of insifficient
rating, eg your kitchen needs 25 A, but it's only 15 A, then you may change
it with a larger one, but remember, that a CB protects the cable downstream,
that means CB are matched to the cable they are connected to. If the cable
is too thin for the thermal trip of the CB, then the breaker may not trip,
but the cable will melt! Eg here in Europe, a 16 A CB is used with a 2.5
mm^2 cable (#16 AWG). If you use a 20 A CB for your convenience (to avoid
continuous tripping) and the cable draws 20 continously, it will melt! In
that case, first you upgrade the cable to a thicker one, and then the CB to
a larger one.
major in electrical engineering
I suspect your dealing with the type of transfer panel that diverts
the loads one at a time. Each load to be carried by the generator
passes through the transfer panel and is protected by a second breaker
installed in the transfer panel at all times. The transfer panel
breakers are often sized lower in ampacity than the circuits original
breaker. If there is no twenty ampere breaker available in the
emergency panel that can be swapped with the fifteen ampere breaker
now on that circuit then you may need to install a different transfer
arrangement. I have always found those one circuit at a time transfer
switch setups to be trouble breeders.
Since that type of transfer arrangement is manual I would substitute
the whole panel interlocked breaker arrangement that is now available
for most recent panels from the original equipment manufacturers.
Those are much simpler to operate and take much better advantage of
the load diversity in the homes wiring. They also allow you to
operate any load that the generator can carry instead of limiting you
to only particular circuits.
It has the automatic transfer switch.
I just was of the impression the generator panel only came into effect
during emergency operation. Guess it is always in use. Hence the 15A
breaker tripping under street power.
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