Electrical sub-panel (homes) — connections tightened per service (per panel)
Added to an annual package (ready, custom or institution); not sold on its own.
Checking the distribution sub-panel and tightening its connections.
Unit: per panel. The price is per service; quantity = number of panels × times a year.
Carried out during your annual subscription visits; the engineer confirms the numbers at the first visit: any excess is charged and any shortfall refunded. The price is fixed for the subscription year.