Elektrotechnické inženýrství

This part of IEC 61249 specifies requirements for properties of PTFE filled unreinforced laminated sheet of a thickness 0,02 mm up to 3,2 mm, of defined flammability (vertical burning test), copper-clad.

This part of IEC 61249 is applicable to the design, manufacture, use of PTFE filled unreinforced laminated sheet of defined flammability (vertical burning test), copper-clad.

Its flame resistance is defined in terms of the flammability requirements of 8.2.

1.1 This part of IEC 61508 contains information and guidelines on IEC 61508-2 and IEC 61508‑3.

Annex A gives a brief overview of the requirements of IEC 61508-2 and IEC 61508-3 and sets out the functional steps in their application.

Annex B gives an example technique for calculating the probabilities of hardware failure and should be read in conjunction with 7.4.3 and Annex C of IEC 61508-2 and Annex D.

Annex C gives a worked example of calculating diagnostic coverage and should be read in conjunction with Annex C of IEC 61508-2.

Annex D gives a methodology for quantifying the effect of hardware-related common cause failures on the probability of failure.

Annex E gives worked examples of the application of the systematic capability tables specified in Annex A of IEC 61508-3 for safety integrity levels 2 and 3.

Annex F gives examples on how to include failures of the diagnostic function in the calculation of the safety parameters.

Annex G gives guidance on how to estimate the failure rates from field feedback with confidence intervals and specifically in the context of compliance with route 2H requirements in 7.4.4.3.3 of IEC 61508-2 or route 2S requirements as stated in 7.4.9.5 of IEC 61508-2.

Annex H gives guidance on robust safety architecture.

1.2 IEC 61508-1, IEC 61598-2, IEC 61508-3 and IEC 61508-4 are basic safety publications, although this status does not apply in the context of low complexity E/E/PE safety-related systems (see 3.4.3 of IEC 61508-4). This document provides further information to complement these basic safety publications.

1.3 One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. In this context, the requirements, test methods or test conditions of this basic safety publication will not apply unless specifically referred to or included in the publications prepared by those technical committees.

1.4 Figure 1 shows the overall framework of the IEC 61508 series and indicates the role that IEC 61508-6 plays in the achievement of functional safety for E/E/PE safety-related systems.

Figure 1 – Overall framework of the IEC 61508 series
 

This document specifies a method for measuring the electrical outputs, current and high voltage, from electroshock weapons (ESWs) that deliver an electrical stimulus to humans. This Document is applicable to any and all ESWs. This Document describes ESW measurement systems to help guide the user of this standard in developing their own ESW measurement system.  It includes methods for measuring and/or computing a variety of parameters that may be used to characterize the electrical output of the ESW. The user of this standard should select those parameters that are appropriate for their applications and stakeholders.