I did an LTSpice simulation of switching 120 volts through a 600 uH
inductor into an 8 ohm load. The inductor delays 30 amps of current
through the load by 600 microseconds and 15 amps by 200 microseconds.
Even with the fast switching speed of a magnetic breaker, the delay is
insignificant. I think the best magnetic breaker switches in about 3
milliseconds.
Also, the human body will never draw enough current to flip a normal
breaker. On the other hand if a person touches the hot wire of a GFCI
protected circuit while in contact with a ground, the person will
unbalance the current in the hot-neutral circuit and trip the GFCI if
the current imbalance exceeds 10 to 20 milliamps. This protects human life.
Tom W0IVJ
On 2/1/2016 2:58 PM, Jim Brown wrote:
On Mon,2/1/2016 1:19 PM, Tom Thompson wrote:
I respectfully disagree. The choke in the green wire and the common
mode choke both are 300uH. A short circuit current between the hot
and the green wire would pass through both chokes in series. At 60 Hz
the total impedance is 0.2 ohms which is not going to affect the
breaker or fuse blowing.
But it's NOT 60 Hz, it's an impulse. And if the choke is effective at
killing RFI, it's got significant resistive impedance at the
frequencies of that impulse.
The question is not WILL it blow the fuse/breaker, but will it blow
FAST ENOUGH to protect someone from electrical shock.
73, Jim
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