Practical
Top 10 Mistakes in Greenhouse Wiring
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Section: GreenhousesNorm reference: NEN 1010:2020+C1:2024, 705
AI-checked: automatically reviewed for norm references, not yet assessed by a qualified person. This page has not yet been technically reviewed by a qualified person. Always check the current standard and your own appointment (aanwijzing); this is not a substitute for NEN 3140 or NEN 1010.
Updated: ≈ 1 min read
Top 10 errors in greenhouse wiring
Based on inspection reports and NEN 1010/3140 audits in Dutch greenhouses.
- IP class too low — IP44 in zones where IP55 or higher is required (§705).
- 30 mA RCD not installed on mobile equipment handled by staff.
- N-conductor shared between RCD groups — RCD trips randomly, people bypass it.
- HF interference from lighting fixtures blinds RCD type A — type F or B required.
- Unprotected cables through walkways — no mechanical protection, requirement §705.
- Main equipotential bonding missing on CO₂ pipes — danger in case of insulation fault.
- Pt1000 sensors in 2-wire connection — measurement drift, poor climate control.
- No logbook for installations / work equipment — NEN 3140 mandatory.
- Extension cords longer than allowed without voltage drop calculation.
- Unauthorized switching under load — no VOP/VP indication, Arbowet violation.
See also: NEN 1010 §705 Horticulture and NEN 3140 VP.
Further reading
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- §514 / IEC 60364-5-51Circuit identification in the distribution board — why an up-to-date wiring schedule is not an optional extra
- IEC 60309-1IEC 60309 CEE plugs — colour code and clock position of the earth pin