Cite
HARVARD Citation
Institution,, B. (2021) BS EN 61557-7 AMD1. Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V DC. Equipment for testing, measuring or monitoring of protective measures.. [Online]. London : British Standards Institution. Available from: http://access.bl.uk/ark:/81055/vdc_100117719362.0x000001