Cabling from solar panels has to be placed, accordance the NEN1010: 2015, in a pipe or cable tray. This in connection with touch-safety (high DC-voltage) and preventing insulation faults. Cable tray’s by a horizontal outdoor use is preferred as (in accordance with NEN 1010: 2015 522.3.2) possible condensation in the tube must be able to be discharged. In a passage through the roof is a feed-through tube, the only standard-compliant solution. The RoofDuct achieves an entirely airtight passage which also directives with the NEN1010: 2015.
522.3.2 When in piping condensation may occur or water can collect, provisions should be made to drain it.
522.8.1 Pipeline systems must be selected and installed so that damage and maintenance to cables and insulated conductors and their connections during installation can be prevented.
5126.96.36.199 cables without armouring may only be used when they are properly protected against mechanical damage by the construction in appropriate pipes, sleeves, chutes or channels.
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The NPR 5310 is an informative document and does not have any requirements. Thereby following references are not an obligation but a recommendation. Since fire is of great importance the NPR 5310 referred, if necessary, to requirements of a standard. This will be mentioned in the text, NPR 5310 will almost always refers to the NEN 1010. To improve readability this will not always be indicated in the text. If by a requirement of a standard there is no other standard as source indicated, the source is NEN1010.
5.2.2 Penetrations through fire resistant walls
If the DC wiring of a PV system runs through a fireproof transit, this transit should stop DC arcs. This can for example be achieved by using before the positive and negative cables two separate passages with a mutual distance of 10 cm.
5.2.3 Prevention of propagation of arcs
Although the positive and negative cables should be put together as close as possible in order to keep inductive loops small (see 6.2.2) some distance between those cables within the duct is preferably in order to prevent propagation of parallel arcs. When cables are bundled it’s extra important as arcing between a plus and min cable will affect the insulation of the cables and the full array of energy can cause major damage to the arc. If necessary, two cable ducts can be used mounted next to each other. Also other installation methods are possible to prevent the propagation of arcs.
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