DB Board Upgrades, RCDs & Surge Protection

What “good” looks like

A good DB board is neat, labelled and balanced. Breakers are correctly sized. Earth leakage (RCD/RCBO) trips fast when it should, and never for no reason.

Neutral and earth bars are tidy. There’s a clear main isolator, and where you have a generator or inverter, there’s a clean changeover and proper isolation so you never back-feed ZETDC.

With surge protection fitted, sensitive gear—TVs, routers, fridges, NVRs, gate motors—survives the power-return spikes that are common after load-shedding.

Signs you need a DB board upgrade

• Frequent “nuisance” trips or nothing trips when it should

• Warm or buzzing breakers; burning smells around the board

• Old, mixed or mismatched breakers with no clear labelling

• No RCD/earth leakage on key circuits (sockets, bathrooms, outdoors)

• No surge protection, and appliances keep dying after outages

• Loose wiring, taped joints, or overcrowded enclosures

• New loads added (inverter, generator, pumps, air-con) but the board never kept up

• Repeated shocks from appliances, gates or metal fittings

The protection devices (and what they actually do)

• MCB (miniature circuit breaker): Protects cables from overloads and short circuits. Think “too much current for too long” or “fault to short.”
• RCD / Earth leakage: Protects people. If current leaks to earth—through a person or wet equipment—it trips quickly.
• RCBO: Combines an MCB and an RCD in one device—great where space is tight or you want both protections per circuit.
• SPD (surge protection device): Soaks up high-energy spikes when power returns or during lightning activity, protecting sensitive electronics. We typically use a combination of Type 1/2/3 depending on your site.
• Main isolator & changeover/ATS: Lets you safely switch the property between grid and backup power (generator/inverter) and isolate for maintenance.

Surge protection & earthing (the Zimbabwe reality)

Load-shedding causes “all-at-once” restarts and voltage spikes that are rough on electronics. Without SPDs and solid earthing, TVs, routers, fridges and NVRs are regular casualties.

We install SPDs in the board and verify earthing and bonding so surges have a safe path to ground. On three-phase sites, we check phase balance and neutral integrity—loose or stressed neutrals cause strange flicker, dimming, and equipment failures.

Our upgrade process

1) Inspect & test. We open the board, test RCD trip times, check breaker ratings and cable sizes, measure insulation resistance and earth continuity, and note any heat, damage or loose terminations.
2) Plan & list circuits. We confirm what each breaker feeds, label unknowns, and plan placements for RCD/RCBO coverage, SPDs, isolators and (if present) generator/inverter changeover.
3) Upgrade & tidy. We replace tired breakers, add RCD/RCBOs where needed, fit SPDs (Type 1/2/3 as appropriate), re-terminate conductors, separate neutrals, tidy busbars, and label everything.
4) Balance & integrate. We balance phases (on 3-phase), integrate clean changeover/ATS, and ensure the board cannot back-feed ZETDC.
5) Test & handover. We re-test, document results, and walk you through the layout—what each breaker does, where the main switch is, and what to do in an emergency.

RCDs vs RCBOs—what should you use?

Both protect people. If space allows, we often place RCDs to protect groups of circuits (like all sockets), but where you want fewer nuisance trips and better selectivity, RCBOs per circuit are excellent—they trip only the faulty circuit, not half the house.

We blend the two to suit your board size and budget.

Integrating generators and inverters

If you have backup power, your DB board needs a compliant changeover or ATS, correct neutral-earth strategy, and proper isolators on both sides.

We make sure backup feeds only the circuits you intend and never energises the utility side. We also add SPDs so power-return spikes and generator transitions don’t take out your electronics.

Three-phase boards (shops, workshops, small industry)

We tidy control panels, balance phases, and protect motors with the right breaker curves and settings. We check rotation, fit phase-loss/undervoltage protection where needed, and label clearly so staff know what can and cannot be switched during load-shedding.

Prepaid meters, isolators & inspections

We ensure the meter box and isolators are neat and compliant and that isolation points are obvious. If the prepaid meter itself acts up, we’ll prove your side is sound and guide the next steps with ZETDC.

What to expect on upgrade day

Power will be off for part of the work. We isolate safely, protect floors/counters, and keep things tidy. Once devices are fitted and wiring is dressed, we test, restore power, and run through a simple handover. You’ll have a labelled board, clearer fault-finding, and less stress when power returns after load-shedding.

Care & tips

• Don’t keep resetting a breaker that trips repeatedly—WhatsApp us.

• Keep the board area dry, ventilated and free of storage.

• If you’re adding heavy new loads (welders, pumps, air-cons), tell us first—right sizing prevents nuisance trips.

• After storms or unusual surges, a quick check can save equipment.

Areas we cover in Zimbabwe

Harare, Bulawayo, Chitungwiza, Mutare, Gweru, Masvingo, Kwekwe, Kadoma, Chinhoyi, Marondera, Bindura, Norton, Ruwa, Nyanga, Victoria Falls—and other towns.