A GFCI will protect against a shock that would result from the hot wire
conducting current to the ground conductor or external ground, but it will not
protect against a shock from the hot to the neutral wires. One can still be
seriously shocked in a GFCI-protected circuit.
Ed, W1RFI
-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of Jim Brown
Sent: Tuesday, February 02, 2016 12:43 AM
To: Rfi List
Subject: Re: [RFI] Galaxy Grow Light Ballast Update
On Mon,2/1/2016 7:50 PM, DWKANEPE@aol.com wrote:
> Just a point of information...a fuse or circuit breaker will NOT and
> is not intended to prevent electrical shock.
That is WRONG.
> Ground Fault Circuit Interrupter protection will!
GFCI's protect against a very different mechanism, namely leakage current.
GFCI's sample current in the phase (hot) and neutral conductor, and open the
circuit if they are out of balance by more than
6-10 mA, which means that current must be flowing on the Green wire, and
producing enough IR drop between the Green wire and other grounded objects
(like plumbing).
> Fuses, breakers and other OCPD's are intended to protect wiring and,
> in some cases, utilization equipment.
AND human life.
Fuses/breakers protect us in the case of a FAULT -- that is, something causes a
short between phase and exposed equipment, causing the exposed equipment to be
hot with respect to ground.
BTW -- I've been paid to TEACH and write tutorials on this stuff for more than
ten years.
73, Jim K9YC
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