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  2. Dielectric withstand test - Wikipedia

    en.wikipedia.org/wiki/Dielectric_withstand_test

    An insulation test set; in this pattern, a hand-cranked generator provides the high voltage and the scale is directly calibrated in megohms. Voltage withstand testing is done with a high-voltage source and voltage and current meters. A single instrument called a "pressure test set" or "hipot tester" is often used to perform this test.

  3. Electrical wiring in North America - Wikipedia

    en.wikipedia.org/wiki/Electrical_wiring_in_North...

    The most commonly used insulation type in AC electrical distribution systems throughout North America is THHN ("Thermoplastic High Heat-resistant Nylon-coated" [17]). This is a specification for PVC insulation (other thermoplastics are permitted, but rarely used) with a nylon jacket for abrasion resistance. THHN is suitable for dry or damp ...

  4. Resistance wire - Wikipedia

    en.wikipedia.org/wiki/Resistance_wire

    Nichrome, a non-magnetic 80/20 alloy of nickel and chromium, is the most common resistance wire for heating purposes because it has a high resistivity and resistance to oxidation at high temperatures, up to 1,400 °C (2,550 °F). When used as a heating element, resistance wire is usually wound into coils.

  5. Mineral-insulated copper-clad cable - Wikipedia

    en.wikipedia.org/wiki/Mineral-insulated_copper...

    PVC-sheathed MICC cable. Conductor cross section area is 1.5 mm 2; overall diameter is 7.2 mm. Mineral-insulated cables at a panel board. Mineral-insulated copper-clad cable is a variety of electrical cable made from copper conductors inside a copper sheath, insulated by inorganic magnesium oxide powder.

  6. Trace heating - Wikipedia

    en.wikipedia.org/wiki/Trace_heating

    Mineral insulated cables ran at high current densities to produce heat, and control equipment was adapted from other applications. [3] Mineral-insulated resistance heating cable was introduced in the 1950s, and parallel-type heating cables that could be cut to length in the field became available.

  7. Water heating - Wikipedia

    en.wikipedia.org/wiki/Water_heating

    Direct electric resistance tank water heaters are not included in the Energy Star program; however, the Energy Star program does include electric heat pump units with energy factors of 200% or higher. Tankless gas water heaters (as of 2015) must have an energy factor of 90% or higher for Energy Star qualification.

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