IEC 61936-1 defines critical spatial requirements to prevent arcing and accidental contact.

First, let's clear up a common point of confusion. IEC 61936-1 cover public overhead lines (that’s IEC 61865). Instead, it focuses on power installations —specifically:

If you are designing a new HV installation, start with Chapter 4 (Basic Planning). If you are upgrading an old one, jump directly to Chapter 8 (Earthing). But whatever you do, do not rely on LV thinking—1 kV AC is a whole different world.

How do you know a circuit is truly dead? IEC 61936-1 defines the requirements for:

It achieves this by mandating strict requirements across four key domains: