- String Junction/combiner box is to be provided on DC power side to collect the electrical power from the strings.
- String Junction Box shall be stand alone units to be erected nearer to modules at an optimized distance to reduce the DC losses.
- The box enclosure is dust, vermin and water proof, impact resistant. The box is having IP 66 protection for enclosure and protection class II.
- The Box of polycarbonate material with resin free material offering fire resistance and anti-hygroscopic nature.
- All terminals inside the String/Array junction box are of copper and connected to copper bus bar of proper size to reduce Internal ohmic and heat losses.
- The String/Array junction box have suitable cable entry points fitted with MC- 4 compatible connectors.
- Each string input is protected with suitable fuse to prevent the fault current feeding in reverse direction with suitable arrangement of isolation and connection.
- All fuses have fuse holder for human protection with fuse blown indication.
- The strings can be isolated during live condition with fuse folders thus avoiding generation loss.
- SCB provided with suitable SPD of Type I & II of MOV type between positive and negative buses and earth to protect the system against lightning and switching surges.
- DC PHOTOVALTIC fuse will be provided on positive side of each strings if system is with negative grounding. (Both side fuse protection system is also available on demand)
- The fuse rating should be so designed that it should protect the string and module from high reverse current flow and derated for ambient temperature.
- Each design tested for temperature rise test. Maximum temperature rise permitted is 30°C over an 50°C ambient temperature.
Trisquare Switchgears
Intelligence in Reliability
