[RFI] Galaxy Grow Light Ballast Update

[DWKANEPE at aol.com]

Just a point of information...a fuse or circuit breaker will NOT and is not 
 intended to prevent electrical shock. Ground Fault Circuit Interrupter  
protection will! Fuses, breakers and other OCPD's are intended to protect 
wiring  and, in some cases, utilization equipment.
 
73
Don
WB2BEZ
 
 
In a message dated 2/1/2016 6:49:50 P.M. Eastern Standard Time,  
w0ivj at tomthompson.com writes:

Jim,

This choke is on the *Lamp *side of the ballast, not on  the *Line *side, 
so it is unclear what a short circuit among any of the  wires on the Lamp 
side will do.  It largely depends on the ballast  circuitry.

Tom

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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