The Offices were Connected by Wires

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<br> The first four chapters cover definitions and rules for installations (voltages, connections, markings, etc.), circuits and circuit protection, methods and materials for wiring (wiring devices, conductors, cables, etc.), and general-purpose equipment (cords, receptacles, switches, heaters, etc.). The NEC also permits grounding-type receptacles in non-grounded wiring protected by a GFCI; this only applies when old non-grounded receptacles are replaced with grounded receptacles, and the new receptacles must be marked with ‘No equipment ground’ and ‘GFCI Protected’ . For internal references, some lengthy articles are further broken into « parts » with Roman-numerals (parts I, II, III, etc.). Electrical Construction and Maintenance Magazine, Conductors for General Use, Chapter 3 Articles in NEC, starting with Article 342 This section is expected to be modified to include cables in future editions. Walter Schossig Introduction to the history of selective protection, PAC Magazine, Summer 2007 pp. Article 210 addresses « branch circuits » (as opposed to service or feeder circuits) and receptacles and fixtures on branch circuits.Electrical Construction and Maintenance Magazine, Branch Circuits, Part 2. There are requirements for the minimum number of branches, and placement of receptacles, according to the location and purpose of the receptacle outlet. Likewise, an AHJ may make a written approval of an installation or product that does not meet either NEC or listing requirements, although this is normally done only after an appropriate review of the specific conditions of a particular case or location.<br>
<br> To be listed, the device must meet testing and other requirements set by a listing agency such as Underwriters Laboratories (UL), SGS North America, Intertek (Formerly ETL), Canadian Standards Association (CSA), or FM Approvals (FM). To be labeled as fit for a particular purpose (for example « wet locations », « domestic range ») a device must be tested for that specific use by the listing agency and then the appropriate label applied to the device. The PPTC thermistor is self-resetting in that when current is removed, the device will cool and revert to low resistance. A full-load wire does heat up slightly due to the metallic resistance of the wire, but this wire heating is factored into the cable’s temperature rating. Prior to 1972, however, the aluminum wire used was manufactured to conform to the 1350 series aluminum alloy, but this alloy was eventually deemed unsuitable for branch circuits due to galvanic corrosion where the copper and aluminum touched, resulting in poor contact and resistance to current flow, connector overheating problems, and potential fire risk. The red plastic sleeve above the clamp identifies the name of the owner and provides a contact telephone number.<br>
<br> Most types of top contact shoes simply hang from a beam suspended between the axleboxes of the bogie. Rapid devices – which can top up a car battery from empty to 80 per cent in around half an hour – make up just over a quarter of the 1,222 additional devices fitted. GFCI devices come in many configurations including circuit-breakers, portable devices and receptacles. One GFCI receptacle can serve as protection for several downstream conventional receptacles. The NEC also has rules about how many circuits and receptacles should be placed in a given residential dwelling, and how far apart they can be in a given type of room, based upon the typical cord length of small appliances. Moulded plugs for unearthed, double-insulated appliances may instead have a non-conductive plastic pin (an Insulated Shutter Opening Device or ISOD) the same size and shape as an earth pin, to open the shutters. The first British standard for domestic three-pin plugs was BS 317 Hand-Shield and Side Entry Pattern Three-Pin Wall Plugs and Sockets (Two Pin and Earth Type) published in 1928. This was superseded in 1930 by BS 372 Side-Entry Wall Plugs and Sockets for Domestic Purposes Part II which states that there are only minor alterations from BS 317. In 1934, BS 372 Part II was in turn superseded by the first edition of BS 546 Two-Pole and Earthing-Pin Plugs and Socket Outlets.<br>
<br> The explanations are only for reference and are not enforceable. The introduction and the first 8 chapters contain numbered parts, articles, sections (or lists or tables), item, specifics, inclusions/exclusions, precise inclusion/exclusion, italicized exceptions, and explanatory material – explanations that are not part of the rules. Most automotive fuses rated at 32 volts are used on circuits rated 24 volts DC and below. Semi-enclosed fuses are fuse wire carriers in which the fusible wire itself can be replaced. 8 AWG. Hence, copper wire is used almost exclusively in branch circuitry. Based on the National Electric Code’s (NEC) technical definition, it is « a factory assembly of one or more insulated circuits enclosed in an armor of interlocking metal tape, or smooth or corrugated metallic sheath. » Standard ones usually contain three connectors made of copper or aluminum. Cables with CSS connectors are an upgraded Type 2 equipped with two extra contacts allowing for up to 170kW power ratings.<br>

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