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Why Does the Power Trip When It Rains? An Auckland Fault-Finding Guide

  • 6 days ago
  • 2 min read

If your power trips when it rains, water is getting into something electrical — most often an outdoor power point, garden lighting, a shed feed, or a roof leak dripping onto wiring. The RCD is doing its job: it senses current leaking to earth through the moisture and cuts the circuit. The fix is finding the wet point, and an electrician can usually isolate it in one visit. Here is how to narrow it down before we arrive — and when to stop and call.

Tripping right now? Call 021 889 770 — fault finding across Auckland, fastest central and east.

The usual suspects, in order

  • Outdoor power points — failed seals, cracked covers, or sockets mounted where rain drives in. The number one cause.

  • Garden and landscape lighting — corroded fittings and waterlogged junctions, especially cheap gear near the coast.

  • Shed, garage or gate feeds — underground cables with damaged insulation flooding in heavy rain.

  • Roof and gutter leaks — water tracking down into ceiling fittings or junction boxes; common in older Auckland homes.

  • Rangehood, bathroom or wall vents — wind-driven rain entering through external penetrations.

What you can safely check yourself

With dry hands, at the switchboard: note WHICH breaker or RCD trips — that tells us the circuit. Unplug everything on that circuit, especially anything outside or in the garage, and try resetting. If it holds, plug items back one at a time until it trips again — you've found the culprit appliance or extension lead. If the RCD won't reset at all with everything unplugged, the fault is in the fixed wiring: stop there and call. Never open fittings, never work on wet gear, never hold an RCD closed.

What a fault-finding visit costs

Standard Auckland rates apply — $90–$150 per hour plus a callout — and most rain-related faults are isolated within the first hour with insulation-resistance testing. The repair itself is often minor: a replaced outdoor socket, a re-terminated junction, a properly rated cover. Chronic culprits (corroded garden lighting runs) are worth replacing outright rather than patching every winter.

Frequently asked questions

Is it dangerous to keep resetting the RCD?

Resetting once to test is fine. Repeatedly forcing a tripping RCD back on while something is wet defeats the device protecting you — if it keeps tripping, leave that circuit off and get it looked at.

Why did this start after new landscaping or a new deck?

Classic — a spade or post-hole through an underground cable, or fittings disturbed during the work. The damage leaks only when soaked, so it shows up with the first decent rain.

My whole street lost power — same thing?

No — if the neighbours are dark too, it's a network outage: check your lines company's outage page. If only your house is out, it's your installation — that's ours.

Sick of the winter tripping ritual?

EWRB-registered electricians · Made safe first, fixed properly second · Based in Remuera, working Auckland-wide

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