BS IEC 60533-2015 pdf free 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.
5EMG test plan
5.1Objective
Prior to performing the tests,an EMC test plan shall be established. lt shall contain as aminimum the elements given in 5.2 to 5.5.
Tests detailed in this International Standard are normally conducted as type tests and shall becarried out whenever possible at an EMC test laboratory. For test procedures，reference ismade to lEC basic standards.
However，in cases where type tests are impracticable (e.g. large mechanical dimensions ofequipment, functional control),individual tests may be performed. This can be done in situ, ifnecessary,and in accordance with a tailored test procedure. /n-situ testing is not as repeatableas testing on a test site.Therefore,care should be taken when using the results of in-situtesting on one site to predict compliance for a product from series production.
5.2Configuration of equipment under test(EUT)
5.2.1 General
Ships’ systems are not uniform assemblies. The type，number and installation of equipment,whether installed individually or integrated，may vary from system to system. Hence it is notreasonable to test every possible arrangement; however, it is recommended to carry out typetests.
For a realistic simulation of the EMC situation (related both to emission and immunity), anassembly of EUT with its auxiliary equipment, such as cabling， power supplies,etc. shall bebuilt to represent a realistic installation.This assembly shall be operated as far as possibleunder normal conditions (including the software).
5.2.2Assembly of EUT
lf the EUT to be type tested is a system, subsystem or equipment likely to be installed atdistributed locations, one or more typical configurations with all components of the EUT shallbe chosen to reproduce the real installations.A justification for the chosen configurations shallbe provided in the EMC test plan.
NOTE The type test certificale issued after the test is valid only for the EUT composition listed in the EMC testplan.
5.2.3EUT interconnecting cables
A sufficient number of interconnecting cables shall be selected.At least one of each type ofinterconnecting cable shall be used during testing in a representative configuration.
Interconnecting cables shall be standardized types, see Table B.1. Where special cables arerequired, the manufacturer of the EUT should provide the specification.
5.2.4Auxiliary equipment
A list of all auxiliary equipment shall be provided.The auxiliary equipment enumerated shall besufficient to simulate all realistic operational conditions and to ensure that all feasible types ofoperation can be performed.BS IEC 60533 pdf download.