Electric cables for photovoltaic systems.
Electric cables for use in photovoltaic systems are suitable for mobile, suspended or fixed installation, both indoors and outdoors. It can also be installed in tubes, channels, in or under plaster and in appliances.
Given the demanding climatic conditions that these cables endure due to their permanent installation outdoors for very long periods of time, usually years, the environmental requirements to be satisfied in this area are strict and reflect the variable working conditions to which they will be subjected to these cables during their useful life.
Therefore, environmental tests are essential in this type of cables and the particular design standards establish various environmental tests and the thermal endurance test to recreate the working conditions over time. Another requirement to fulfill is the fundamental low temperature behavior for outdoor installations that require mechanical stability at temperatures below 0ᵒC.
Other tests that include the certification of these cables would be:
- Measurement of conductor resistance
- Complete cable tension test
- Measurement of insulation resistance
- Long-term resistance of the insulation to direct current
- Surface resistance of the roof
- Dimensional measurement of the cable
- Dynamic penetration test
- Roof shrinkage test
- Vertical flame spread test
- Full cable smoke emission
- Evaluation of halogens for non-metallic materials
- Mechanical properties before aging
- Resistance of the cover to acidic and alkaline solutions
- Mechanical properties after oven aging
- Compatibility test
- Hot elongation test
These cables can be designed according to the UNE-EN 50618 and IEC 62930 standards, being commonly referred to as H1Z2Z2-K.