Electroacoustics. Hearing aids - Induction-loop systems for hearing aid purposes. System performance requirements1 Scope This part of IEC 60118 is applicable to audio frequency induction loop systems producing an alternating magnetic field at audio frequencies and intended to provide an input signal for hearing aids operating with an induction pick up coil (telecoil). Throughout this standard, it is assumed that the hearing aids used with it conform to all relevant parts of IEC 60118. This standard specifies requirements for the field strength in audio frequency

Manufactured stone masonry units according to EN 771‑5 and natural stone units according to EN 771‑6 are not covered

see BS 6263‑2) but does include guidance on the decisions made at the design stage which assist cleaning and maintenance and enable the installation to give satisfactory service

complete and non-ambiguous enough to allow implementers to derive an efficient design of the system in the specific technological environment that will be selected for the physical implementation

design rules

and performance criteria for point-type multisensor incorporating in one mechanical enclosure at least one carbon monoxide sensor and at least one heat sensor fire detectors for use in fire detection systems installed in and around buildings

Flange parameters

multi-sensor detectors or radio-linked detectors were incorporated

with or without needles

and finish of terminals to manufacture durable and high-quality terminals for use in electrical apparatus for railway signalling purposes

anode roughening and inherent filtration

BS EN 4818 covers following aspects:

BS EN 50318 is the European standard on railway vehicles that explains the current collection systems in railways