Rooftop solar PV installation combines the hazards of working at height with the electrical risks of handling DC-generating equipment. Panels produce voltage as soon as they are exposed to daylight and cannot be fully switched off during installation. Falls from roofs, through fragile roof lights, and electric shock from DC circuits are the primary risks. Edge protection, crawling boards for fragile roofs, and strict DC electrical safety procedures are essential for every rooftop solar installation.
Key Hazards
Falls from the roof edge during panel positioning and mounting rail installation
Falls through fragile roof lights or deteriorated roof coverings
DC electric shock from panels that are live whenever exposed to daylight
Manual handling injuries from carrying panels up ladders and across roof surfaces
Control Measures
Install edge protection around the full perimeter of the roof before starting any installation work.
Identify and protect all fragile roof elements including skylights with crawling boards or covers.
Treat all solar panels as electrically live during daylight and use insulated tools for DC connections.
Wear electrical safety gloves rated for the DC voltage when making cable connections.
Use mechanical lifting to get panels and mounting rails onto the roof wherever practicable.
Cover panels with opaque sheeting to reduce voltage generation during wiring where required.
Ensure all roof workers are trained and competent in both work at height and DC electrical safety.
Plan the installation sequence to minimise time spent at unprotected edges and fragile areas.
Ensure all DC cabling is correctly routed, secured, and labelled before connection to the inverter.
Emergency / Rescue
If someone receives a DC shock, break the circuit by covering the panel or disconnecting the DC isolator. Do not touch the casualty while in contact with a live source. Call 999 and begin CPR if needed.
Remember
Solar panels generate electricity in daylight and cannot be switched off during installation hours.
Falls from roofs and through fragile surfaces are the primary fatal risks during rooftop solar work.
Edge protection must be installed around the full roof perimeter before anyone steps onto the surface.
DC electric shock is particularly dangerous because the current does not naturally release the victim.
Insulated tools and electrical safety gloves are mandatory for all DC wiring and connection work.
Every rooftop solar installer must be competent in both work at height and DC electrical safety.
Applicable Legislation: Work at Height Regulations 2005 · Electricity at Work Regulations 1989 · BS 7671 (IET Wiring Regulations) · CDM Regulations 2015