Laying wiring on a roof is not the trickiest part of installing a solar panel system. At least, if you know what to look for. In this blog, we’ll tell you all about the primary guidelines when installing DC infrastructure.
A good start is half the battle
The most important thing is the right choice of cables. Since July 1, 2017, only CPR (a standard for fire classification) approved cables may be purchased and used in projects. The right solar cable meets:
- Fire reaction class Dca
- Smoke class S2
- Applicable at an ambient temperature of up to 90 degrees.
- Water resistance AD8
In accordance with NEN1010 damage to the cable sheathing must be prevented at all times. We therefore recommend using wire tray that is not hot dip galvanized to prevent residue. This is because the formation of residue can lead to sharp edges that can cause damage when installing the cables… RoofSupport therefore has a smooth surface in combination with a corrosion resistance of 8+ and therefore no sharp edges!
Use wire tray scissors
Wire tray should be cut with asymmetrical wire tray cutters to avoid sharp edges. The ends can be capped with a rubber cap.
PLUS and MINUS cables close together
The Dutch practice guideline NPR 5310:2017 – part 712 6.1.2 recommends to lay the PLUS and MIN cables as close to each other as possible to avoid induction loops. But make sure there is always some space between them so that arcs do not have a chance.
Keep excess length on cabling
Pull the cable back a bit in the bends made so that there is room to absorb shrinkage. This will prevent unnecessary tensile stress.
Good cable management is indispensable for a fire-safe PV installation! Would you like to know more about this important topic? Then request our knowledge document ‘The 6 steps to fire safety for PV installations’ or contact one of our experts.