Solar PV Installation RAMS Guide for UK Contractors

Key Topics in a Solar PV Installation RAMS

DC electrical safety — live systems

Unlike AC systems, solar PV generates DC voltage whenever exposed to light. DC circuits cannot be isolated by switching off the inverter alone — the panels themselves remain live. The RAMS must specify: no work on live DC strings without arc flash assessment; use of insulated tools rated for DC; appropriate PPE including arc flash protection; and procedures for working on the array in low-light conditions where safe isolation is possible.

Roof work at height

Solar PV installation is typically carried out on pitched or flat roofs, often at significant height. The RAMS must apply the WAH 2005 hierarchy: edge protection or collective measures first, then personal fall arrest as last resort. Roof access procedures, roof loading limits, fragile roof surface identification, and exclusion zones below the working area must all be addressed.

Structural loading

Before installation, the RAMS must confirm that a structural engineer has assessed the roof's ability to carry the additional dead load of the PV array, fixings, and mounting system. The RAMS must reference the structural assessment and confirm that the installation follows the approved mounting design.

DNO notification and G99/G98

Systems over 3.68 kW (single phase) or 11 kW (three phase) typically require G99 approval from the Distribution Network Operator before connection. The RAMS must identify which standard applies, confirm that DNO approval has been obtained or is in progress, and describe the commissioning and notification procedure.