BS IEC 60533:2015 pdf download-Electrical and electronic installations in ships — Electromagnetic compatibility (EMC) — Ships with a metallic hull.
4 General Ships’ equipment and systems can be exposed to various kinds of electromagnetic disturbances conducted by power or control lines or directly radiated from the environment. The types and levels of disturbances depend on the particular conditions in which the system, the subsystems or the equipment are installed and to be operated. The individual equipment of a ship can also be a source of electromagnetic disturbances over a wide frequency range, conducted through power and signal lines, or directly radiated, affecting the performance of other equipment or influencing the external electromagnetic environment. The acceptance criteria for the tests for immunity requirements are related to performance criteria which are defined in terms of operational requirements. For the emission limits, the objective of these requirements is to ensure that the disturbances generated by the equipment and systems do not exceed a level which could prevent other equipment and systems from operating as intended. The emission limits of this International Standard may not, however, provide adequate protection against interference to radio receivers when other ship equipment is used closer than 3 m to the receiving antenna, see Annex A. In special cases, for instance when highly susceptible equipment is being used closer than 3 m to a transmitting antenna, additional mitigation measures may have to be employed to increase the electromagnetic immunity beyond the limits specified in Clause 7. NOTE The minimum immunity requirements in Clause 7 represent a typical electromagnetic environment and have been selected so as to ensure an adequate level of immunity for ships.
5 EMC test plan 5.1 Objective Prior to performing the tests, an EMC test plan shall be established. It shall contain as a minimum the elements given in 5.2 to 5.5. Tests detailed in this International Standard are normally conducted as type tests and shall be carried out whenever possible at an EMC test laboratory. For test procedures, reference is made to IEC basic standards. However, in cases where type tests are impracticable (e.g. large mechanical dimensions of equipment, functional control), individual tests may be performed. This can be done in situ, if necessary, and in accordance with a tailored test procedure. In-situ testing is not as repeatable as testing on a test site. Therefore, care should be taken when using the results of in-situ testing on one site to predict compliance for a product from series production.