Electric vehicle charging infrastructure with individual metering in a condominium

The assembly approved before the calculation

The minutes allowed twelve 7 kW chargers fitted by the residents themselves, wired straight into the block board. That board was six years old and had no spare capacity: existing load already reached 84% of the contracted demand during the afternoon peak. Installed as approved, the first twelve chargers would have tripped the main breaker inside the garage.

A load study before the quote

• Real usage profile metered over 21 days across the three blocks: return times, connection duration and simultaneous power
• Inventory of what was already there: feeder sizing, board capacity and the condition of the earthing system
• A staged occupancy scenario: 48 bays ready today, expansion to 96 foreseen without replacing the main feeder

1. A charging board of its own, fed by a dedicated circuit from the main board of block A
2. A 150 kVA reservation with bus-bar demand management so simultaneity never touches the tariff peak
3. Per-bay metering with its own register and billing kept apart from the condominium fee
4. Conduit, tray and disconnection points signed along the garage escape route

The specification carried one clause the building manager asked for in writing: no individual connection without sign-off from the technical lead. With 21 days of metering on record, NBR 17019-1 stopped being a corridor argument and became a specification — the one that backs the ART record and the garage insurance.