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  2. Appliance classes - Wikipedia

    en.wikipedia.org/wiki/Appliance_classes

    In Europe, a double insulated appliance must be labelled Class II or double insulated or bear the double insulation symbol: ⧈ (a square inside another square). As such, the appliance should not be connected to an earth conductor because the high-impedance casing will cause only low-fault currents that are unable to trigger the fusible cut-out.

  3. ISO 7010 - Wikipedia

    en.wikipedia.org/wiki/ISO_7010

    ISO 7010 is an International Organization for Standardization technical standard for graphical hazard symbols on hazard and safety signs, including those indicating emergency exits. It uses colours and principles set out in ISO 3864 for these symbols, and is intended to provide "safety information that relies as little as possible on the use of ...

  4. Piping and instrumentation diagram - Wikipedia

    en.wikipedia.org/wiki/Piping_and_instrumentation...

    A diagram which shows the interconnection of process equipment and the instrumentation used to control the process. In the process industry, a standard set of symbols is used to prepare drawings of processes. The instrument symbols used in these drawings are generally based on International Society of Automation (ISA) Standard S5.1

  5. Portable appliance testing - Wikipedia

    en.wikipedia.org/wiki/Portable_appliance_testing

    Health and safety regulations require that electrical appliances are safe and well maintained to prevent harm to workers. Many equipment manufacturers recommend testing at regular intervals to ensure continual safety, with the interval between tests varying based on both the type of appliance and the environment in which it is to be used.

  6. Insulation system - Wikipedia

    en.wikipedia.org/wiki/Insulation_system

    Double insulation is a design concept where failure of one insulation system will not expose the user to a shock hazard due to the presence of a second independent layer of insulation. Reinforced insulation is a supplemental insulation system that is strong enough to effectively perform as if a double insulation system was present.

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  8. File:Double insulation symbol.svg - Wikipedia

    en.wikipedia.org/wiki/File:Double_insulation...

    Printable version; Page information; Get shortened URL; Download QR code; In other projects Appearance. move to sidebar hide ... Double Insulation Symbol: Width: 150 ...

  9. Double insulated - Wikipedia

    en.wikipedia.org/?title=Double_insulated&redirect=no

    This page was last edited on 29 January 2005, at 17:02 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.