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EAC grid connection: the specification that decides the job

What EAC requires for a grid connection in Cyprus: capacity limits, metering, protection settings and how to verify what was actually installed.

8 min read

Eac Grid Connection — illustrasjonsbilde

Photo: Annas Zakaria on Pexels

ByChristos Hadjiyianni· Editor, electrical and storage

Christos covers electrical work, battery storage and the off-grid and commercial systems that sit on top of them. He tracks EAC grid connection requirements and export limits, which constrain more Cypriot installations than roof area ever does.

Published

An EAC grid connection is specified by four things: the supply the property already has, the AC capacity the system will inject into it, the metering arrangement, and the protection settings the inverter has to hold. Everything else in a connection pack — drawings, datasheets, test sheets — exists to document those four. A system fails at connection stage when one of them was assumed rather than established.

The specification in plain terms

The existing supply. Cyprus distributes at 230 V single-phase and 400 V three-phase, 50 Hz. What matters for a PV connection is not the nominal voltage but the capacity already contracted at the property: the main fuse rating and the connection agreement behind it. That figure is the ceiling. A system specified above it triggers a supply upgrade, and a supply upgrade is a separate application with its own timeline and its own cost, quoted separately or not at all.

The AC capacity. The number that goes on the application is the inverter's continuous AC output, not the array's DC rating. On a three-phase supply the inverter must distribute that output across all three phases, or a single-phase inverter must be allocated to a phase deliberately rather than to whichever terminal was nearest. Unbalanced injection is a common reason an otherwise correct system gets rejected or export-limited when the application is assessed.

The metering arrangement. Whether generation is netted against consumption, credited at a separate rate, or not exported at all is decided by the scheme in force, not by the installer. What the specification must state is what the meter has to do: register import and export separately, and be readable against the inverter's own logs. The scheme in force is published by the Ministry of Energy, Commerce and Industry and regulated by the Cyprus Energy Regulatory Authority, and the applicable version should be confirmed at the time of application rather than taken from a quote written months earlier.

The protection settings. An inverter connected in parallel with the distribution network must disconnect when the network is not there — loss-of-mains protection — and must stay inside a defined voltage and frequency window. These are configured values, not fixed hardware behaviour. The correct values come from EAC's published connection requirements. An inverter left on a factory default belonging to another country's grid code is electrically functional and contractually non-compliant.

Where the local feeder is already carrying a lot of embedded generation, the application can come back requiring a load assessment before an export limit is agreed. Dense tourist-area networks are the clearest example: connections around Germasogeia frequently need one, and the assessment sits on the critical path rather than beside it.

Standards that apply in Cyprus

Three families do most of the work, and it is worth knowing which one governs which argument.

  1. Connection behaviour — the EN 50549 family

    EN 50549-1 covers generating plant connected to a low-voltage distribution network, with EN 50549-2 for medium voltage. This is the standard that defines what the inverter must do at the point of connection: trip windows, reconnection behaviour, power quality, and how export limitation is demonstrated. EAC publishes its own connection requirements on top of this family, and the edition and the parameter set that apply on the day of application should be taken from EAC directly.

  2. Equipment safety — IEC 62109, IEC 61215, IEC 61730

    IEC 62109 covers inverter safety, IEC 61215 module performance and durability, IEC 61730 module safety qualification. A quote that names module and inverter models lets these be checked in an afternoon. A quote that says "tier-one modules" does not.

  3. The installation itself — national wiring practice and ETEK

    Cable sizing, isolation, earthing and labelling follow the wiring rules applied to any fixed installation in Cyprus. The design and the certification of that installation are signed by an engineer registered with the Cyprus Scientific and Technical Chamber. The registration is personal, held by a named individual, and can be checked against the chamber's own register.

Two of those three are checkable from a datasheet in an afternoon. The third is only checkable on site, which is why the certification that accompanies the installation matters more than the brand names on the equipment. A specification that names standards but produces no certificate against them has documented an intention rather than an installation.

Common specification errors

Sizing against the roof instead of against the supply. The array is specified to fill the available area, then the AC capacity is derived from it, and only at application stage does the existing main fuse rating come into the conversation. The correct order is the reverse: establish the contracted capacity first, then size the inverter, then size the array to the inverter.

Leaving the country code at the factory setting. Inverters ship configured for a default market. The commissioning step that changes it is a short piece of menu navigation and is skipped often enough to be worth asking about explicitly. The symptom is either nuisance tripping on a weak feeder, or silent non-compliance that surfaces at inspection.

Cable derating calculated at a temperature that does not occur here. A tabulated current rating assumes an ambient. Conduit clipped to a flat roof in Nicosia in August is nowhere near that ambient, and the inland districts carry the widest temperature range on the island. The specification should state the ambient assumed and the derating factor applied. If neither appears, the cable was sized from a table rather than for the site.

String voltage calculated at the wrong end of the temperature range. Module open-circuit voltage rises as temperature falls. The governing case is a cold, clear winter morning at the highest inland site in the portfolio — not the summer condition everyone pictures when they think of Cyprus. The maximum system voltage of the inverter has to survive that morning, not the annual average.

Export limiting promised but never configured. Where a connection offer carries an export cap, the limitation has to be implemented and demonstrated, usually with a meter at the point of connection feeding back to the inverter. A line in the quote is not an implementation.

Applying after commissioning. The application belongs before energisation. Reversing the order turns a routine approval into a retrospective one, and retrospective approvals are where systems get told to reduce capacity.

How to check what was installed

Verification is a paperwork exercise plus a short walk-around at the equipment. It does not need specialist instruments.

  1. Ask for the application reference and the acceptance

    Not the installer's assurance that it was submitted — the reference number and the correspondence back from EAC, including any export limit or condition attached to the offer.

  2. Read the inverter's active grid code from its own display

    The configured country or grid-code profile is visible in the installer menu and appears in the commissioning report. Compare it with what EAC's requirements specify. This is the fastest check available and the one most often skipped.

  3. Find the loss-of-mains trip test in the commissioning record

    A commissioning report should record the protection test as performed, with the result, not describe it as a feature of the equipment.

  4. Walk the single-line diagram against the installation

    DC isolators where the drawing says, labelling present and legible, earthing arrangement as drawn, inverter model matching the one quoted. Discrepancies at this stage are cheap to fix and expensive to discover later.

  5. Reconcile the export register against the inverter logs

    A week after energisation, read the meter's export register and compare it with what the inverter reports as exported. Large disagreement points at either the metering configuration or the export limitation, and both are correctable while the installer is still on site.

An independent electrician can carry out that walk-through without being involved in the original installation, and the cost of doing so is small against the cost of discovering a configuration error after the retention has been released.

The commercial solar and electrical sections of this site cover the connection process end to end, and the district coverage pages record where local network capacity has been a constraint on recent applications.

Common questions

Does a PV system need EAC approval before it is switched on?

The connection application is submitted before commissioning. Energising a generating installation in parallel with the distribution network without that approval leaves the system outside the framework it is supposed to sit inside, and any correction is then retrospective.

How long does a connection application take?

Around 45 days is the typical duration for a straightforward application. Cases requiring a load assessment take longer, and the assessment is the variable — the paperwork around it is not.

Is a three-phase supply necessary?

It depends on the contracted capacity at the property and the AC rating of the proposed system, not on the size of the roof. Where a single-phase supply is already at its limit, the choice is between a smaller system and a supply upgrade, and the upgrade is a separate application.

What does an export limit actually mean in practice?

That the system may generate freely for on-site consumption but may not push more than a stated amount onto the network. It is implemented in the inverter, usually with a meter at the point of connection, and it should be visible in the commissioning record as a configured and tested value.

Who signs the electrical design?

An engineer registered with the Cyprus Scientific and Technical Chamber. The registration belongs to the individual rather than to the company, so the name on the drawings is the name to check.

Can the specification be checked without opening anything?

Most of it, yes. The application reference, the connection offer, the single-line diagram, the inverter's configured grid code and the commissioning report together cover the four things that define the connection. Physical inspection confirms that the installation matches them.

Registered electrical contractors

8 companies covering this area.

Sources

  1. Electricity Authority of Cyprus — connection requirements — retrieved 2026-07-28
  2. Cyprus Energy Regulatory Authority — metering and connection framework — retrieved 2026-07-28
  3. Cyprus Scientific and Technical Chamber (ETEK) — engineer registration — retrieved 2026-07-28

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