True PV Safety. Anywhere.

As a result of this market development, the Technical Committee TC82 of the International Electrotechnical Commission (IEC) will more carefully distinguish the requirements for different ambient temperature ranges and prepare the new edition of  safety standards for PV modules, IEC 61730-1, for applications at operating temperatures of up to 70°C  (98th percentile - for 98 out of 100 applications). For applications at higher operating temperatures, such as installations in desert regions, the specifications of IEC TS 63126 will apply.

IEC TS 63126 identifies thermal requirements not only for PV modules, but also for added components like PV junction boxes or PV connectors, for two different temperature levels. The two categories for these modules are:

Temperature Level 1: greater than or equal to 80°C (T98th - in 98 out of 100 cases)
Temperature Level 2: greater than or equal to 90°C (T98th).

Section 6.3 of this technical specification lists the requirements for PV connectors according to IEC 62852 for use at the module temperature levels described above. The connectors’ upper limiting temperatures (ULT) are required to have the following minimum values:

ULT for connectors used for installation of Level 1 PV modules:    at least 95°C
ULT for connectors used for installation of Level 2 PV modules:    at least 105°C 

The requirements for insulation coordination in the safety standards for electrical products are usually designed for applications at altitudes up to 2000 m (Elevation above sea level). For applications at higher elevations, the requirements for clearances must be corrected because the lower air pressure reduces the electrical installations’ resistance to voltage flashover across the clearance. Therefore, the minimum clearance must be multiplied by a correction factor from Table A.2 of IEC 60664-1:2020 or verified with a correspondingly higher test surge voltage.

According to IEC/EN 60529 standard, the protection degree IP describes the protection against water ingress when submerged in a defined depth for a defined time. This IP degree states how long a product can be submerged without damage. This is an essential criterion for floating PV systems to ensure that the components still provide reliable functionality even when submerged, e.g., by heavy loads during storms or snow.