It is the intentionally grounded conductor (neutral) that carries the unbalanced current from other conductors of the same circuit. 1103.9 Operable Parts. Questions can be sent to letthecodedecide@earthlink.com. to be permanent. The branch-circuit breaker supplying the distribution panel is the only required disconnecting means. BX is armored cable, and the requirements are shown in NEC Article 320. TROUT answers the Code Question of the Day on the NECA Web site. Does the NEC allow you to change an old two-prong 120V ungrounded receptacle to a three-prong 120V grounded receptacle when the wiring method inside the metal outlet box is the old-style BX, manufactured before 1959 with no metal bonding strip inside cable? Where more than two NM cables containing two or more current-carrying conductors are installed in contact with thermal insulation without maintaining spacing between the cables, the allowable ampacity of each conductor must be adjusted in accordance with Table 310.15(B)(2)(a). These receptacles must be marked “No Equipment Ground.” Grounded receptacles can be installed downstream supplied from the ground-fault circuit interrupter (GFCI) receptacle. (CMP-1) Dwelling, Multifamily. If you have a problem related to the National Electrical Code (NEC), are experiencing difficulty in understanding a Code requirement, or are wondering if or why such a requirement exists, ask Charlie, and he will let the Code decide. NEC 110.14(C)(1)(b) permits—for termination provisions of equipment for circuits rated over 100A—the use of conductors rated 75°C. Correlating Committee�s request to the Usability Task Group to investigate Part II provides calculation methods for branch-circuit loads. Derating of conductors in Type NM cables is addressed in NEC 334.80. Loads added to an existing dwelling unit(s) shall comply with the following as applicable: Loads for structural additions to an existing dwelling unit or for a previously unwired portion of an existing dwelling unit, either of which exceeds 46.5 m2 (500 ft2), shall be calculated in accordance with 220.12 and 220.14. This example shows the calculations required where additional loads are included with the original loads already calculated in Example No. This means that, if the equipment is not marked with a temperature rating but is marked or rated for 100A or less, the provisions of 110.14(C)(1)(a) must be used. This change is intended to make the definitions sleeping, cooking, and sanitation eating, Perhaps what you were taught was that, when calculating the adjustment factors in 310.15(B)(2), it is permitted by 310.15(B)(4)(a) to not count a grounded-neutral conductor that carries only the unbalanced current. One or more rooms for the use of one or more persons as a housekeeping unit with space for eating, living, and sleeping, and permanent provisions for cooking and sanitation. cooking, and sanitation are now all defined as permanent, whereas the For the largest motor on Line B we use 8A 0.25 = 2A. • A receptacle outlet is required in a dwelling unit attached garage [210.52(G)], but a receptacle outlet isn’t required in He can be reached at letthecodedecide@earthlink.net. The revised definition is that which is found Questions can be sent to letthecodedecide@earthlink.com. Electrical Contractor Magazine, If you have a problem related to the National Electrical Code (NEC), are experiencing difficulty in understanding a Code requirement, or are wondering if or why such a requirement exists, ask Charlie, and he will let the Code decide. A building that consists solely of one dwelling unit. What does “dwelling unit” mean in the NEC®? He helped write the NEC Since 1990; he was a member of NECA’s National Codes & Standards Committee and chairman of the National Fire Protection Association (NFPA)’s... Having trouble finding time to sit down with the latest issue of In connecting power to a permanently installed sound system rack, can I wire three or four branch circuits directly to the power distribution inside the rack? a housekeeping unit with space for living, NEC 300.21 requires that openings around electrical penetrations through fire-rated walls, partitions, floors or ceilings must be fire-stopped using approved methods to maintain the fire-resistant rating. (Note: Editorial #60 – match NEC … ©Copyright 2005 BlueVolt and the NJATC. be a �housekeeping unit� has been deleted. suite, and the usage of those terms in the NEC were also included. Does a dwelling-unit receptacle installed more than 51⁄2 feet above the floor need to be tamper-resistant? 0 Comments Add a Comment. Provisions for living, sleeping, Receive all latest updates and answers right into your inbox. An equipment-grounding conductor must not be connected from the GFCI-type receptacle to any outlet supplied from the GFCI receptacle. To calculate the requirement for the largest motor as required by 430.24, we must use the largest motor on Line A, which is 12A 0.25 = 3A on Line A and 3A for the neutral. What is the derating requirement for Type NM cables? You are permitted to install a distribution panel inside the rack where you can wire branch circuits as needed. Article 220 of the National Electrical Code (NEC) provides requirements for calculating branch-circuit, feeder and service loads. A building that contains three or more dwelling units. Am I required to provide a disconnecting means other than the dedicated branch-circuit breakers? Elevators within the unit shall comply with Section 407, 408, or 409. If the equipment is not marked with a temperature rating but is marked for circuits rated over 100A, 110.14(C)(1)(b) must be used. Preplanned Post-Installation Inspections: Do you need periodic testing of water features after the work is complete?

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