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AFNOR
NF EN 50520/A1
En Vigor
2021-09-17
Cover plates and cover tapes for the protection and location warning of
buried cables or buried conduits in underground installations
AFNOR
NF EN IEC 61757-2-1
En Vigor
2021-09-17
Fibre optic sensors - Part 2-1 : temperature measurement - Temperature
sensors based on fibre Bragg gratings
AFNOR
NF EN IEC 60794-1-402
En Vigor
2021-09-17
Optical fibre cables - Part 1-402 : generic specification - Basic
optical cable test procedures - Electrical test methods - Lightning test
(for OPGW, OPPC and OPAC), Method H2
AFNOR
NF EN IEC 60255-187-1
En Vigor
2021-09-17
Measuring relays and protection equipment - Part 187-1 : functional
requirements for differential protection - Restrained and unrestrained
differential protection of motors, generators and transformers
