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Requirements for underground burial of photovoltaic panel armor cables

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Requirements for underground burial of photovoltaic panel armor cables [PDF]

6 FAQs about [Requirements for underground burial of photovoltaic panel armor cables]

What are the requirements for buried cables?

For public and private electrical installations, Regulation 522.8.10 of BS 7671:2018+A2:2022 provides requirements for cables buried in the ground. Generally, a cable buried in the ground is required to incorporate an earthed armour or metallic sheath or both, suitable for use as a protective conductor.

Are buried cables buried in the ground a BS 7671 requirement?

I guess they're thinking of reg 522.8.10 of BS 7671 which requires cables buried in the ground to have an earthed metallic sheath or earthed metallic armour or be in a duct or conduit that provides equivalent protection. That might well be a peculiarly UK requirement (I've seen buried cables on the continent without any armour.)

How do I locate a cable buried in the ground?

Generally, a cable buried in the ground is required to incorporate an earthed armour or metallic sheath or both, suitable for use as a protective conductor. The location of a buried cable is also required to be marked by cable covers (see Figure 2) or a suitable marker tape (see Figure 1).

Is a cable protection system suitable for direct burial?

The cable spec is EU and states is suitable for direct burial. The protection system constantly monitors the insulation resistance and dis engages the inverter upon fault. The client has stated a non compliance due that no mechanical protection has been installed underground but all cables above ground are mechanically protected.

Do buried cables need to be protected?

Regulation 14 (2) of the Electricity Safety, Quality and Continuity Regulations (ESQCR) 2002 and Regulation 15 (2) of the ESQCR (Northern Ireland) 2012, require that all buried cables shall be installed at a sufficient depth, or otherwise protected, to avoid damage or danger.

Should PV power plants be buried directly?

The direct burial of cables at PV power plants can be a cost-effective approach – ensuring that cabling is out of the worst weather conditions and cannot be damaged by maintenance crews or local critters. However, when the cables are not themselves fit-for-purpose, it can lead to their breaking down, potentially causing faults and fires.