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2. In applications of 600 V or less, overcurrent protection is typically located at the load end of the field installed conductors, NEC 240.21(C). (or Part VIII of Article NEC 240.21, with some exceptions, requires overcurrent protection in each ungrounded conductor to be located where the conductors connect to the load. True 31 Aug 2020 The NEC requires that conductors are protected from overcurrent at the source of the overcurrent unless the circuit complies with 240.21(B). NEC 240.15. Ungrounded Conductors.
Location in Circuit. NEC 240.23. Change in Size of Grounded Conductor*. NEC 240.30. Enclosures 240.21(B) Feeder Taps.
Table 250.102(C)(1) Grounded Conductor, Main Bonding Jumper, System Bonding Jumper, and Supply-Side Bonding Jumper for Alternating-Current Systems. Click below to receive the free PDF and a supporting video excerpt from the NEC Training. To download the Table 250.102(C)(1), Click Here To download NEC Handbook NEC 240.21 is about the location of the overcurrent device, not the need for it.
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Mike Holt Enterprises offers comprehensive electrical exam prep materials delivered in In 240.21(A) Branch-Circuit Conductors, we find a method of performing taps for branch circuits, but note that you are referred back to Article 210.19 and 210.20 for the exact applications. In subsection (B) we start to deal with the Feeder Taps, which are further broken down to five conditions. Thanks to the NEC Connect for sharing Table 250.102(C)(1) and Section 240.21(A)&(B). Table 250.102(C)(1) Grounded Conductor, Main Bonding Jumper, System Bonding Jumper, and Supply-Side Bonding Jumper for Alternating-Current Systems.
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Conductors shall be permitted to be tapped, without overcurrent protection at the tap, to a feeder as specified in 240.21(B)(1) through (B)(5). The tap shall be permitted at any point on the load side of the feeder overcurrent protective device. Section 240.4(B) shall … NEC 2014 edition electrical code tap rules The NEC article dealing with overcurrent protection of feeder taps is article 240.21(B). These rules are often referred to as the NEC “tap rules”. There are five tap rules related to feeder circuit taps: − Taps Not Over 3 m (10 ft.) Long − Taps Not Over 7.5 m (25 ft.) Long NEC 240.21 is about the location of the overcurrent device, not the need for it. I bring up these three points because it’s easy to become so involved in the “location” rules (240.21) that you may misinterpret them into meaning that secondary conductor 4.
1 Apr 2014 Question 20: 240.21(C)(1)(2)&(3) Transformer Secondary Conductors.
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Per 240.21 (C) (1), for a single-phase transformer having a 2-wire (single-voltage) secondary or a 3-phase, delta-delta connected transformer having a 3-wire (single-voltage) secondary, secondary feeder shall be permitted to be protected by an OCPD on the primary side of the transformer, “provided this protection is in accordance with Sec. 450.3 and does not exceed the value determined by multiplying the secondary conductor ampacity by the secondary-to-primary transformer voltage ratio.” 240.21 Location in Circuit. Overcurrent protection shall be provided in each ungrounded circuit conductor and shall be located at the point where the conductors receive their supply except as specified in 240.21(A) through (H).
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: This is not a new rule or revision to the 2005 NEC. Since Carlon has introduced a NEW Raintight Service Entrance Head it was worth locating the requirement in the NEC. Article 240 . Overcurrent Protection .
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Overcurrent protection shall be provided in each ungrounded circuit conductor and shall be located at the point where the conductors receive their supply except as specified in 240.21(A) through (H). Conductors supplied under the provisions of 240.21(A) through (H) The NEC does permit tap conductors to have overcurrent protection set at a value that greatly exceeds the ampacity of the conductors, but this is only permitted under specific conditions outlined in 240.21.
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FALSE Code (NEC) 2008, and is detailed in Article 240.21(B) Feeder Taps. According to Article 240.21(B) Feeder Taps, “conductors shall be permitted to be tapped,.