When power comes back after a grid fault or a shelling-related outage, the voltage can spike. Thunderstorms send surges down the line, and a broken neutral in the building causes phase imbalance — so a socket that should supply 230 V may see close to 400 V. Gas boilers, fridges and inverters take the hit. A single voltage relay won't protect against all of that. We build protection as a system: we check the consumer unit, fit a voltage relay and a surge protective device (SPD), install or test the earthing, wire the boiler, inverter and automatic transfer switch correctly — and explain what each part protects against. For flats and houses, single-phase or three-phase.
We look at what is already there: breakers, RCDs, relays, cable sizes, the condition of connections and whether there is a protective earth conductor. We explain what is missing and what can stay — no unnecessary replacements. We also service protection installed by other electricians.
It cuts the power when the voltage goes outside safe limits — after a broken neutral or a deep sag, for example — and restores it with a delay once the grid has settled. We size the relay to the load current and set the thresholds. On a three-phase supply we fit a three-phase relay or one per phase, depending on whether you have three-phase equipment.
A surge from lightning or switching in the grid lasts microseconds, far too short for a voltage relay to react. That is the job of a surge protective device, which diverts the surge to earth. Type 1 goes at the service entrance of a house with an overhead supply or a lightning rod, Type 2 in the consumer unit of a flat or house, Type 3 next to sensitive equipment.
Without proper earthing an SPD has nowhere to divert the surge, so it simply doesn't work. In a private house we install an earth electrode system; in a flat we find out what the building provides. We measure earth resistance with a tester and issue a test report.
We wire a gas boiler on its own circuit, earthed and with the correct live and neutral orientation — many boilers need this to detect the flame reliably. We integrate the inverter into the consumer unit so that neutral and earth on its output are connected correctly and the RCDs still trip when you are running on batteries.
An ATS switches the house from the grid to a generator or inverter and back on its own. The two sources never end up on the same line: the generator can't feed power back into the grid, and the grid can't reach the generator's output.
Tell us what you have: a flat or a house, single- or three-phase, a boiler, an inverter, a generator. A photo of your consumer unit helps us prepare for the visit.
From 1,500 ₴ in Kyiv and from 2,000 ₴ in Kyiv region, credited toward the work. The engineer inspects the consumer unit and the incoming supply, checks for earthing and how your appliances are connected.
We explain what protects against what, and which parts you actually need. You approve a quote listing the work and equipment before we start.
We install the equipment, set the relay thresholds, label the circuits and test everything. We show you what the relay's indicators mean and what to do when it trips.
Prices are for labour only; equipment is extra. Relays, SPDs, breakers and materials appear as separate lines in the quote. The cost of fitting an SPD depends on its type, the number of phases and the space in the consumer unit, so we price it after the inspection. You get the exact total before work starts.
| Voltage relay installation in the consumer unit | pc | from 900 ₴ |
| SPD installation in the consumer unit | panel | by quote |
| Consumer unit assembly (up to 12 breakers) | pc | from 800 ₴ |
| Consumer unit assembly (up to 24 breakers) | pc | from 1,500 ₴ |
| Earth electrode system installation | set | from 8,000 ₴ |
| Earth resistance test with report | pc | from 1,200 ₴ |
| ATS installation | pc | from 3,500 ₴ |
| Engineer visit in Kyiv with panel inspection (credited toward the work) | visit | from 1,500 ₴ |
| Engineer visit in Kyiv region with panel inspection (credited toward the work) | visit | from 2,000 ₴ |
They protect against different things. A voltage relay reacts to deviations lasting from a fraction of a second upwards: a broken neutral, phase imbalance, a voltage sag. A surge from lightning or grid switching lasts microseconds — too fast for the relay — and it is the SPD that diverts it to earth. That is why proper protection usually includes both.
It depends on the building. If a house is fed by an overhead line or has a lightning rod, it needs a Type 1 SPD at the service entrance, often combined with Type 2 in a single device. In a flat's consumer unit, Type 2 is usually enough. Type 3 is fitted next to sensitive equipment as an extra layer, not instead of the first two. We choose the exact setup after the inspection.
No. An SPD diverts the surge to earth and doesn't work without it. In a private house we install an earth electrode system and measure its resistance. Older apartment blocks often have no separate protective earth conductor — at the inspection we explain which options are safe for your particular building. We never connect earth to a radiator or water pipe and advise against it: it puts people at risk.
In a flat the essentials are a voltage relay and a Type 2 SPD in the consumer unit, because the main risk there is a broken neutral in the riser or at the building's supply, which pushes socket voltage up. A private house adds the service entrance, an earth electrode system, a Type 1 SPD and often an inverter, generator and ATS. On three phases we monitor each phase, and if you have three-phase equipment we disconnect all phases together so nothing runs on an incomplete supply.
We don't repair appliances ourselves, but we can arrange a repair through a service centre, under warranty or paid. Meanwhile we inspect your consumer unit, find what the protection is missing and make a repeat much less likely.
No protection gives an absolute guarantee, which is why we don't promise compensation. A properly built system — voltage relay, SPD, earthing, correctly wired boiler and inverter — significantly reduces the risk of damage from voltage spikes, surges and phase imbalance. We explain exactly what it protects against before work starts.
Same rates for the work and the same warranty as in Kyiv. A site visit in the region starts at 2,000 ₴ and is credited toward the job.
Tell us about the job in a short form — from replacing a smart relay to a full rewire. We'll send a preliminary estimate within a day.
