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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. 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 ...

5. 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.

6. 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

7. Electrical safety standards - Wikipedia

   en.wikipedia.org/wiki/Electrical_safety_standards

   In 1994 were established Electrical Safety Foundation International non-profit organization dedicated exclusively to promoting electrical safety at home and in the workplace. [ 3 ] Standard 29 CFR 1910.269 – for electric power generation, transmission, and distribution, contained comprehensive regulations and addressed control of hazardous ...