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2. Utilization categories - Wikipedia

   en.wikipedia.org/wiki/Utilization_categories

   Contact load in amperes for heaters (AC1) and motors (AC3) can be found directly on the contactor. The "Utilization category" are mainly categorized in IEC 60947 in the following volume: Volume 1: General requirements; Volume 2: Circuit-breakers; Volume 3: Circuit-breakers, circuit-breakers, switch-disconnectors and switch-fuse units

3. Square D - Wikipedia

   en.wikipedia.org/wiki/Square_D

   Square D is a flagship brand of Schneider Electric, which acquired the company in 1991. The company was listed on the New York Stock Exchange for 55 years prior to its acquisition without reporting financial loss in any calendar quarter, paying out 220 consecutive quarterly dividends to shareholders.

4. Measurement category - Wikipedia

   en.wikipedia.org/wiki/Measurement_category

   Schematic representation of measurement categories. Measurement category is a method of classification by the International Electrotechnical Commission (IEC) [1] of live electric circuits used in measurement and testing of installations and equipment, usually in the relation within a building (residential or industrial).

5. Reference designator - Wikipedia

   en.wikipedia.org/wiki/Reference_designator

   IEC 113 (Superseded by IEC 750, i.e. IEC 60750.) IEC 750-1983 (AS 3702 is equivalent, but provides extra information.) IEEE 315-1975 / ANSI Standard Y32.2. Annex F: "Cross reference list of Class Designation Letters" compares IEC 113-2:1971 to the IEEE/ANSI standard. * AS 1102 and IEC 60617 for "Graphical Symbols for Electrotechnology".

6. Electrical code - Wikipedia

   en.wikipedia.org/wiki/Electrical_code

   An electrical code is a term for a set of regulations for the design and installation of electrical wiring in a building. The intention of such regulations is to provide standards to ensure electrical wiring systems are safe for people and property, protecting them from electrical shock and fire hazards.

7. Selectivity (circuit breakers) - Wikipedia

   en.wikipedia.org/wiki/Selectivity_(circuit_breakers)

   The purpose of selectivity is to minimize the impact of a failure on the network. Faults in an installation are, for example, overload and short circuit. [1] [2] There are four ways in which selectivity is achieved: [3] Current selectivity: different breaking capacities; Time selectivity: time delay before tripping of a breaker