NEN 1010 §414
PELV
PELV (Protective Extra Low Voltage)
Also known as: pelv, isolation-transformer, transformator, isolatietransformator, scheidingstransformator, transformer, safety-transformer
Protective Extra-Low Voltage (PELV): Protective extra-low voltage ≤50 V AC / 120 V DC with reference point earthing. Differs from SELV as accessible metal parts may be connected to PE. Used in tools and signalling circuits.
Practical example
A 24 V control circuit in a switchgear cabinet is implemented as PELV, with one circuit point intentionally connected to PE for reference.
Common mistake
Confusing PELV and SELV regarding earthing: SELV allows no earth connection; PELV allows it at a reference point.
See also
Related terms
In-depth guides
- → Earthing and earthing systems (TN, TT, IT)
- → §414 SELV, PELV & FELV — the extra-low-voltage measure
- → §715 / IEC 60364-7-715 §715 — Extra-low-voltage lighting installations
- → IEC 62109-2 PV inverter — residual current monitoring (RCMU) and earth-fault detection per IEC 62109-2
- → §131 Protection Principles
- → §411.3.2 Automatic disconnection of supply (AUV)
- → §413.3 Electrical separation (§413.3) — an isolating transformer as a protective measure without earthing
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