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Paragraph 1.3.3 F1

(a) Electromagnetic environments are classified into classes E1, E2 or E3 as described below, unless otherwise laid down in the appropriate instrument-specific Schedules.

E1This class applies to instruments used in locations with electromagnetic disturbances corresponding to those likely to be found in residential, commercial and light industrial buildings.
E2This class applies to instruments used in locations with electromagnetic disturbances corresponding to those likely to be found in other industrial buildings.
E3

This class applies to instruments supplied by the battery of a vehicle. Such instruments shall comply with the requirements of E2 and the following additional requirements:

— voltage reductions caused by energising the starter-motor circuits of internal combustion engines,

— load dump transients occurring in the event of a discharged battery being disconnected while the engine is running.

(b)

The following influence quantities shall be considered in relation with electromagnetic environments:

  • — voltage interruptions;

  • — short voltage reductions;

  • — voltage transients on supply lines and/or signal lines;

  • — electrostatic discharges;

  • — radio frequency electromagnetic fields;

  • — conducted radio frequency electromagnetic fields on supply lines and/or signal lines;

  • — surges on supply lines and/or signal lines.

Annotations

Textual amendments

F1

Schs. 1A-1K inserted (E.W.S.) (31.12.2020) by The Product Safety and Metrology etc. (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/696), reg. 1, Sch. 27 para. 49 (with Sch. 27 para. 50(a)) (as amended by S.I. 2020/676, regs. 1(1), 2); 2020 c. 1, Sch. 5 para. 1(1)