Charging columns and IEC 64-8 regulations. What does the law require for a compliant installation?

Installing a wallbox or charging station for electric cars means more than just mounting a device and connecting it to the grid. Every installation must comply with the requirements of CEI Standard 64-8, which is the official reference for the construction of electrical systems in a workmanlike manner, as established by Law 186/68 and by DM 37/08.

The reference section is IEC 64-8/7 – Section 722, updated with Variant V4, which defines the requirements for circuits dedicated to powering electric vehicles.

Only by reflecting these regulations can safety, legal compliance and access to tax benefits be ensured.

Sizing and requirement of dedicated power line for each wallbox charging point

The standard requires that the line be sized according to:

• power rating of the wallbox;
• Distance from the electrical panel;
• Mode of cable laying (exposed, recessed, underground).

Each charging point should have an exclusive power line, separate from other household circuits. The dedicated line reduces voltage drops and overheating risks, ensuring more stable and safer recharging, especially on high-power systems.

Mandatory protections for charging stations.

Every charging facility must be protected against overloads, short circuits and current leakage. To do so, the standard requires:

• Circuit breaker, for overcurrent protection;
• Residual current circuit breaker, for protection against indirect contacts;
• detection of direct current (DC) leakage, either by differential Type B, or combination Type A + RDC-DD complying with IEC 62955. The latter protection is critical because electric vehicle chargers can generate DC currents that, if undetected, render the standard differential ineffective.

Grounding system

A charging installation must be grounded in accordance with the requirements of Part 4 of IEC 64-8. During installation, the earth resistance value must be verified and certified.
Inadequate grounding compromises the safety of the installation and may invalidate the Declaration of Conformity (Di.Co.) and insurance coverages.

Disconnection device

To enable quick and safe intervention, and to avoid inadvertent power interruptions to the entire household system each wallbox supply line must be equipped with a disconnecting device. This device allows the circuit to be physically isolated in case of failure or maintenance. The location must be easily accessible and clearly identified, as required by IEC 64-8/4, Article 473.2.2.1.

The Declaration of Conformity (Di.Co.)

Upon completion of the installation, the company or licensed technician must issue the Declaration of Conformity (Di.Co.), a mandatory document under DM 37/08.

Di.Co. certifies that the facility. :

• Has been carried out according to the rule of art;
• Meets the requirements of IEC 64-8 and IEC EN 61851-1;
• Is eligible to claim bonuses and tax deductions.

A plant without Di.Co. is non-compliant and Can be considered uninsurable.

What is not up to standard according to IEC 64-8

Nonconformities are still widespread, especially in “do-it-yourself” installations or those performed without design verification. Among the most frequent cases are:

• Wallboxes connected to existing non-dedicated outlets;
• Cables with insufficient cross-sectional area compared to the power;
• Absent or inadequate protections (failure of DC detection);
• Grounding not verified or with non-standard values;
• Absence of the Declaration of Conformity.

How to install a wallbox according to IEC 64-8

Section 722 of the standard stipulates that charging of electric vehicles must take place on a dedicated and controlled circuit that complies with IEC EN 61851-1. For home systems, the correct solution is Mode 3, which involves a wallbox with pilot communication and integrated protections.

Acompliant installation must include:

• Independent line with appropriate section;
• Dedicated thermal-magnetic and differential protections;
• DC leakage detection device;
• certified grounding;
• line disconnector;
• Issuance of Di.Co. on completion of work.

Silla Industries wallbox: compliance with IEC 64-8 “out of the box” standard

Silla Industries wallboxes are designed to comply with IEC 64-8 “out of the box,” meaning they are already prepared for safe and certifiable installation.

The Silla Partner network follows a strict installation protocol that includes:

• preliminary technical inspection;
• Laying of dedicated line and protections in accordance with IEC 64-8 and IEC 0-21;
• Issuance of the Declaration of Conformity upon completion of the work.

We guarantee a plant that is safe, efficient and recognized by the relevant agencies in case of incentives or audits.