Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. Equipment for testing, measuring or monitoring of protective measures. Part 4. Resistance of earth connection and equipotential bonding
Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 100 V. Part 2-6. Particular requirements and tests for safety isolating transformers and power supply units incorporating safety isolating transformers
