General > General Technical Chat

RCD trips; What is considered "normal"?

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Halcyon:
Yesterday, I had an RCD trip which feeds a server rack. The rack contains the usual IT equipment; Servers, switches, UPS etc...

I understand that an abnormal condition led to the tripping of the RCD, and I've had this occur before with the same/rack circuit, but I can't pin it on any particular device as over the years, things have been removed/added. Over the past 5-6 years, I've maybe experienced this 3 times, so it's a very random and spurious event, not something that occurs frequently.

My question is, could this be considered "normal" and simply shrug it off, or do I have a bigger, developing problem to try and troubleshoot? Could something such as static build-up or some other odd, random event cause this, as opposed to some piece of equipment going faulty?

TimFox:
Leakage current to PE in multiple line filters?  Either reactive current (too many capacitors in parallel) or inappropriate leakage paths?

Ian.M:
Line filter Y capacitor self-healing events?

Also consider the effect of large common mode transients on surge surpressors that clamp to ground.

Whales:
RCD could be faulty.  They do age and become problematic, they're not designed to last forever.

Any chance it's also an AFI?  Those are famous for EMI sensitivity.

EDIT: Are you using any shielded CAT6 that leaves the room?  Or other comms cable with an earth ref, like HDMI?

Halcyon:

--- Quote from: Whales on May 29, 2024, 11:11:30 pm ---RCD could be faulty.  They do age and become problematic, they're not designed to last forever.

Any chance it's also an AFI?  Those are famous for EMI sensitivity.

EDIT: Are you using any shielded CAT6 that leaves the room?  Or other comms cable with an earth ref, like HDMI?

--- End quote ---

The RCD has been in service for about 8 or 9 years, but if it becomes more of an issue, I'll consider replacing it.

Only comms leaving the cabinet (and the room) is unshielded twisted pair (and fibre).

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