GFI on main service
GFI on main service
(OP)
Hello, I have an installation at 600V that requires ground fault protection (RCD) on the main service disconnect. I have designed it with fuses, but obviously fuses have no RCD. As a GFI breaker at this size would be very expensive, has anyone heard of a stand-alone zero sequence transformer and interrupting circuit? (Yes, essentially a breaker without the thermal/mag trip).
Thanks for your time
Thanks for your time






RE: GFI on main service
Most of the major mfrs sell them, do a search using the term "Ground Fault Relay", GFCI is something different.
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RE: GFI on main service
I have found a GFR with a neutral cond. C/T. Considering the GFR is still just a signalling device, I still require an external interrupting device (moulded case switch). With this setup I still require OCP by means of fuses upstream. Seems to me this setup will be overcomplicated and cost more than just buying switchboard with a GFI MCCB. Thoughts?
Thanks for your time,
RE: GFI on main service
RE: GFI on main service
The decision to use fuses or circuit breakers is one that elicits a lot of debate, but in general if you used fuses for current limiting and/or very high interrupt capacity, you may not be able to replace them with an MCCB. There's more to it than just the ability to shunt trip it.
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: GFI on main service
.. and yes I have the disconnect on the supply side of the fuses. Always good practice to be replacing fuses on live conditions.
Thanks,
RE: GFI on main service
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: GFI on main service
"Throughout space there is energy. Is this energy static or kinetic! If static our hopes are in vain; if kinetic — and this we know it is, for certain — then it is a mere question of time when men will succeed in attaching their machinery to the very wheelwork of nature". – Nikola Tesla
RE: GFI on main service
Good on ya,
Goober Dave
RE: GFI on main service
Another provider is www.boltswitch.com