3408 Ultrasonic installation and hydrophones
3413 Special electrical installations
3415 Electrical transportation and traction equipment
3426 Railway interlocking equipment
3427 Fire signalling and communication equipment
3430 Electrical safety in special conditions
3456 Testing and measuring
3457 Testing of outer environment influences
3458 Magnetic components and measurement
3413 Special electrical installations
3415 Electrical transportation and traction equipment
3426 Railway interlocking equipment
3427 Fire signalling and communication equipment
3430 Electrical safety in special conditions
3456 Testing and measuring
3457 Testing of outer environment influences
3458 Magnetic components and measurement
3462 Insulating systems
3463 Ceramic and glass insulating materials
3464 Testing of electroinsulating materials
3465 Electroinsulating materials
3466 Mica insulating materials for electrotechnics
3467 Electroinsulating liquids
3470 Testing of conductors and cables
3473 Conductors for windings
3463 Ceramic and glass insulating materials
3464 Testing of electroinsulating materials
3465 Electroinsulating materials
3466 Mica insulating materials for electrotechnics
3467 Electroinsulating liquids
3470 Testing of conductors and cables
3473 Conductors for windings
3474 Power conductors
3475 Cords and conductors for special purposes
3476 Power cables
3477 Communication conductors and cords, LF, HF and coaxial cables
3478 LF, instrument, signal and trunk telecommunication cables
3479 Waveguides with accessories, aircraft cables
3480 Insulators, general
3481 Insulators H.T. and E.H.T and special
3475 Cords and conductors for special purposes
3476 Power cables
3477 Communication conductors and cords, LF, HF and coaxial cables
3478 LF, instrument, signal and trunk telecommunication cables
3479 Waveguides with accessories, aircraft cables
3480 Insulators, general
3481 Insulators H.T. and E.H.T and special