Symptom: the site’s RCD/ELCB (or a breaker) trips — at every grid outage, on dewy
mornings, during the backup test, or seemingly at random.
Never bypass, bridge or remove an RCD to “get it running”. Protection stays in the
circuit, full stop. A trip is information — read it.
Check first
- When exactly does it trip? Outage-linked → neutral–earth behaviour in backup. Dewy
mornings → PV insulation. Under one appliance → that appliance. Random → measure, don’t
guess.
- Which device trips — the main RCD, a sub-circuit RCD, or an MCB? An MCB is
overcurrent, not leakage — different flow (Backup Not Working).
- Record the site’s N–E voltage in both grid and backup states — Kent service will ask
for it. [KNB-VAL-04]
Pending Kent validation. [KNB-VAL-04]
The neutral–earth bonding scheme in backup and the approved RCD types/ratings per Kent SKU
are under confirmation with Kent engineering. Until published here: wire PE and backup earth
exactly per the platform AC pages, record N–E voltage in grid and backup states on every
affected site, change no protection devices ad hoc, and escalate persistent outage-linked
tripping with those readings attached.
Escalate when
- Outage-linked tripping persists on a site wired exactly per the platform AC pages — send
the N–E readings, RCD nameplate photo and trip log. [KNB-VAL-04]
- Leakage-class faults persist after the strings insulation-test clean and connectors are
verified dry/sound.
- Anyone proposes running without the RCD “for now” — that is a stop-work, not a workaround.
Related pages
