I respectfully disagree. GFI isn't intended to prevent a shock: it's intended
to prevent death by electrocution. I suspect they do that admirably even with
600 uH total inductance split over two legs. I also doubt that GFI circuits are
intended to protect against RF. I don't know how long a bit of wire is needed
to get 300 uH but I'll bet it's pretty common.
It's probably pretty easy to estimate the current rise time across 300 uH given
series R an zero source impedance and I'd do it but I'm on the road. Overall,
'm not convinced 300 uH in each leg presents a significant hazard or delays a
circuit breaker trip by a dangerous period.
Kim N5OP
"People that make music together cannot be enemies, at least as long as the
music lasts." -- Paul Hindemith
> On Feb 1, 2016, at 16:58, Jim Brown <jim@audiosystemsgroup.com> 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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