This guide explains the installation of multiple Zaptec Go chargers on both TN and IT grids, for 1-phase and 3-phase setups.
Keep in mind:
- Max 3 chargers per home-installation.
- Zaptec Go has integrated earth fault protection (RDC-DD 6mA DC, IEC 62955).
- Protected each charger with a max 40A Type A 30mA RCD circuit breaker (following
NEK 722.531.2.3.101). - Circuit breaker for each charger must be equal in value on multi-installations.
- Avoid daisy-chaining units together.
- Chargers communicate via the cloud for seamless operation.
Multi-installation for TN grid
For TN grids, you can install Zaptec Go chargers using either 1-phase or 3-phase connections. Each charger requires its own Type A fuse with integrated earth fault protection. Use the tabs below to choose your installation type and connection option:
In a TN 3-phase installation with 3-phase connections, load balancing is achieved by distributing 32A across three circuits. During setup, phase rotation must be configured using the Zaptec app, specifying the incoming phases L1, L2, and L3. This ensures better load distribution during 1-phase charging.
In a TN 3-phase system with 1-phase connections, distribute 32A across three circuits. Each charger is wired to separate phases.
In a TN 1-phase system, distribute 32A across three circuits. Each charger must be connected to the same phase—there’s no need for phase rotation in this setup. Ensure each charger is protected by a Type A fuse with integrated earth fault protection.
Note:
Even though each charger has its own 32A circuit, home installations in the portal are limited to a maximum of 32A in total. To provide 32A to each charger simultaneously, they must be registered as separate installations, but this will disable load balancing.
Multi-installation for IT grid
For IT grids, you can install Zaptec Go chargers using either 1-phase or 3-phase connections. The power availability might be more limited in 1-phase IT installations, so load balancing is essential. Each charger requires its own Type A fuse with integrated earth fault protection.
IT 3-phase / 3-phase connections
In an IT 3-phase installation with 3-phase connections, load balancing is achieved by distributing 32A across three circuits. As with TN grids, configure phase rotation using the Zaptec app, specifying the incoming phases L1, L2, and L3 for balanced load distribution.
IT 3-phase / 1-phase connections
In an IT 3-phase system with 1-phase connections, distribute 32A across three circuits. As with 3phase connections, configure phase rotation using the Zaptec app, specifying the incoming phases L1, L2, and L3 for balanced load distribution. Each charger is wired to separate phases.
IT 1-phase / 1-phase connections
In IT 1-phase installations, distribute 32A across three circuits. Each charger is connected to the same phase—there’s no need for phase rotation in this setup. Note that even though this is possible there will not be a lot of available power when connecting three chargers on 1-phase.
UK 🇬🇧 requirements:
An external PEN fault detection device may be required. Typically, this would be required for chargers used for outdoor charging when connected to a PME supply. One appropriately rated device can be used to supply multiple circuits on the same installation. One exception to this is when connecting Zaptec UK Go 7kW to a single-phase PME supply. In this case, the built-in PME fault detection meets the requirements of BS 7671:2018 Amendment 1:2020 clause 722.411.4.1 (iv).
Updated