While the PV industry has a good safety record to date, workers not properly prepared or trained to work with hazards such as electricity, at heights, in ceiling spaces, or with energy storage (batteries), place themselves at risk of serious injury or death.
You and your workers’ health and safety should be everyone’s number one priority and should never be compromised. The best way to do this is to always have appropriate safety procedures and training in place before the start of each job and encourage a workplace where anyone can raise a workplace safety issue, or speak up if they have a safety concern.
Here are some tips to follow to make sure for everyone goes home safely at the end of each day:
Make sure you and your workers only carry out work that you are qualified and competent to do and that any electrical work is undertaken by an appropriately licensed and competent person.
The installation and maintenance of PV systems (including both grid and non-grid connected systems) and associated wiring systems which operate at a voltage greater than extra low voltage (exceeding 50 V a.c or 120 V ripple-free d.c) is classified as electrical work. This means PV solar may only be installed and maintained by an appropriate electrical licence holder.
The electrical risk associated with making incorrect connections, such as with panel-to-panel connectors, may result in serious shock or injury, or significant property damage.
A person without an electrical work licence is authorised to locate, mount or fix in place electrical equipment, including PV arrays, but cannot make or terminate electrical connections to the equipment or install supply conductors that will connect the equipment to a supply of electricity.
Working at heights and near electricity present major risks to workers who work on roofs and in ceiling spaces.
When working on roofs or in ceiling spaces there is a serious risk of electrocution from exposed conductive parts such as guttering, roof sheeting or metal battens as these could be live if there is a fault with the electrical installation.
Before starting any work, turn off and isolate all electricity to the property at the main switchboard and take steps to prevent the electricity from being turned back on while work is in progress (good options include a safety tag and lock out).
The risk of a fall from heights can be minimised by having fall prevention controls in place (e.g. edge protection or harness) to prevent a person falling any distance, or where this is not practicable; fall arrest controls that arrest a person’s fall (e.g. catch platform) and prevent or minimise the risk of death or injury to a person when the fall is arrested. Refer to your state or territory codes of practice and guidelines.
It is important to ensure someone is aware that you will be entering the ceiling and contact is maintained until the work is completed.
Complete a pre-work risk assessment of the roof cavity by looking around the ceiling space to identify other hazards that may pose risks such as, excessive heat, lack of ventilation, lack of lighting, dangerous vermin, sharp objects or asbestos-containing materials.
Even with the power off, avoid contact with electrical cables and equipment as some cables may still be live, such as consumer service lines and solar PV systems which have DC supply cables. Any damaged electrical cables or equipment identified will need repair by a licensed electrical contractor. A risk assessment may also require these supplies to be isolated and steps must be taken to guard against accidental re-energisation.
Energy storage systems (batteries) for homes or small commercial buildings are a serious safety risk if incorrectly installed.
Battery cells have the potential to deliver a severe electrical shock when interconnected as battery banks, reaching hazardous voltage levels. There will also be 230/240 V a.c rated parts or other components such as energy regulators and inverters that have hazardous voltages.
To install a system, you and your workers must be competent and use safe work practices and comply with legislation, wiring rules and other relevant standards, and follow the manufacturer’s guidelines and instructions.
In addition you will need to pass on information to your customer so they can continue to keep it safe and be able to safely shut it down.
Different battery technologies and chemistries have different performance capabilities, and different requirements for installation, operation and maintenance. You will need to be aware of the chosen technology’s hazards and know how to safely handle (including transporting), install and operate the system. Hazards can result from overheating, over-charging or emissions from hazardous chemicals.
A list of operational and installation hazards associated with battery systems can be found in the Clean Energy Council’s Battery Installation Guidelines for Accredited Installers (section 6) www.solaraccreditation.com.au/installers/compliance-and-standards/accreditation-guidelines.html.
Guidance can also be found at www.worksafe.qld.gov.au/injury-prevention-safety/electricity/installing-battery-energy-storage-systems-bess.
Disclaimer: This is a guide only for PV installers. PV system installation and maintenance may have specific local requirements for safety – ensure you and your workers comply with all requirements of the State or Territory you will be working in. For more information on working safely refer to your state or territory Electrical Safety Regulator or Work Safe Organisation.
There are many high-risk hazards associated with solar PV systems. Below is a guide to controlling some of these major hazards.
|Hazard||Pathway of harm||Impact||Control recommendations|
|Working at heights||
||Eliminate: Install ground mounted solar systems|
|Engineer: Install scaffolding around roof top with stair access. Roofer’s kit, guard rails.|
|PPE: Use fall restraint techniques|
|Working in ceiling spaces||
||Eliminate: Install ground mounted solar systems avoiding the need to work in a ceiling space|
|Isolate: Turn off all electricity to the property at the main switchboard and take steps to prevent the electricity from being turned back on while work is in progress*|
|PPE: Wearing appropriate, well maintained and correctly-fitted personal protective equipment when working in dusty ceiling spaces, including:
|Working with and installing electrical equipment||
||Isolate: Lockout Tagout. Test for de-energised (DEAD)
Do not work energised
|Admin: Current LVR/CPR training
PPE: Wear arc rated neck to wrist to ankle clothing with a minimum ATPV of 4calm2.
Wear protective glasses and gloves
||Eliminate: Reorganising work schedules where possible so that outdoor tasks are done before 10 am and after 3 pm|
|Substitute: Rotating tasks that involve direct sun exposure
Increasing amount of shade available – use gazebos
|PPE: Slip on clothing, slop on SPF 30+ sunscreen, slap on a hat, slide on sunglasses.
Drink plenty of water
|Work involves, or is likely to involve, disturbing asbestos
|Eliminate: Do not proceed with job until asbestos-containing material removed by licence contractors|
|Substitute: Replace asbestos switchboard with new upgraded switchboard. Follow safe working procedures|
In producing this message Master Electricians Australia acknowledges the assistance of the Clean Energy Council, Clean Energy Regulator, Electrical Safety Victoria, National Electrical Contractors Association, Queensland Electrical Safety Office and the Smart Energy Council.
If you have questions about staying safe when installing solar Master Electricians have unlimited access to the MEA Safety Hotline. Phone 1300 889 198 today.