240.21 (B) Feeder Taps. 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 not be permitted for tap conductors.

Taps not over 10ft long • 240.21(B)(1); 14. Feeder – 25 Ft. Tap 705.12(D)(2)(2) PV – 160A Continuous Minimum Feeder Tap Size [200A + (160A x 1.25) x .33

The 2002 NEC adopted language similar to transformer feeder taps (240.21 (B)(3)) allowing 25' lengths of secondary conductors 24.21 (C)(6), in locations other than industrial thus the calculation thats been discussed. 2002-03-26 · In addition, conductor overcurrent protection must be provided in each ungrounded circuit conductor and it must be located at the point where the conductors receive their supply [240.21]. The NEC does permit conductors that are identified as “tap conductors” to have overcurrent protection set at a value that greatly exceeds the ampacity of the conductors. Refer to the NEC® for a complete list and for other sections and articles that may be relevant.

Motors on General Purpose : 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 . 240.21(B)(2) Taps Not Over 7.5 m (25 ft) Long. (Schedule 80 Rigid Nonmetallic Conduit) NEC 2017 Requirements for Generator Set Overcurrent Protection load side of the protected terminals in accordance to 240.21(B) 14. Generator Set Overload Notify me of follow-up comments by email. Notify me of new posts by email.

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. Before we get into the details of 240.21, you must understand that a tap conductor isn't permitted to supply another tap conductor.

According to the National Electrical Code, a tap conductor is defined per NEC 240.2 as a conductor, [Transformer Secondary Conductors] of NEC 240.21.

Se hela listan på ecmweb.com Visit http://www.MikeHolt.com/examprep to explore our product catalog. Mike Holt Enterprises offers comprehensive electrical exam prep materials delivered in 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. Before we get into the details of 240.21, you must understand that a tap conductor isn't permitted to supply another tap conductor. Thanks to the NEC Connect for sharing Table 250.102(C)(1) and Section 240.21(A)&(B).

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. 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

If the venue receptacle is correctly protected by an 16 ژوئن 2015 Feeder Tap Rules 240 21B, feeder tap, tap rules, 240.21, NEC 2011, 2011 NEC, calculations, Mike Holt, NEC, National Electric Code, exam The change in 240.21 (B) (1) (1) (b) makes it clear that the tap conductor ampacity cannot be less than the rating of the equipment containing an overcurrent device (s) supplied by the tap conductors or not less than the rating of the overcurrent protective device at the termination of the tap conductors. 240.21 (B) Feeder Taps.

Motors Circuit Conductors: General. NEC 430.22. Single Motor* NEC 430.24.
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Section 240.4 (B) shall not be permitted for tap conductors. conductor overcurrent protection must be provided in each ungrounded circuit conductor and it must be located at the point where the conductors receive their supply [240.21]. The NEC does permit conductors that are identified as “tap conductors” to have overcurrent protection set at a value that greatly exceeds the ampacity of the NEC 2014 edition electrical code tap rules The NEC article dealing with overcurrent protection of feeder taps is article 240.21(B).

When applying panelboards be sure to note the possible requirements of 450 -3 & 240-21 in addition to those found in Article 384. For more information, consult the Bussmann SPD NEC 240.21(C)(2) permits conductors to be connected to a transformer secondary, without overcurrent protection at the secondary where the length of the secondary conductor does not exceed 10 feet and the ampacity of the secondary conductors is not less than the rating of the device supplied by the secondary conductors OR not less than the rating of the overcurrent protective device at the Wiring methods (NEC 300) Junction and cutout boxes ( NEC 300.14) NEC Hazardous Locations (500.15) Equipment for General Use (NEC 400) -1; Commercial Load Calculations (NEC Questions) Commercial Load Calculations-2 : NEC Questions; Transformer Calculations -2 : NEC Questions; Panel Board & Switch Boards-NEC Questions NEC 240.21 Location in Circuit.
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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

(Schedule 80 Rigid Nonmetallic Conduit) NEC 2017 Requirements for Generator Set Overcurrent Protection load side of the protected terminals in accordance to 240.21(B) 14. Generator Set Overload Notify me of follow-up comments by email. Notify me of new posts by email.

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The change in 240.21 (B) (1) (1) (b) makes it clear that the tap conductor ampacity cannot be less than the rating of the equipment containing an overcurrent device (s) supplied by the tap conductors or not less than the rating of the overcurrent protective device at the termination of the tap conductors.

Article 240.21(B)(1), which is known as the 10 ft Feeder Tap Rule, allows an SPD 18 Dec 2020 NEC Article 690.64(A) allows a Line‐Side AC connection to busbars, leads to confusion with the “10‐foot tap rule” and Article 240.21(B). 23 May 2019 All interpretations are based on the 1999 NEC and associated NY Inquiry: Gentlemen, please see question below regarding Article 240.21 3 Oct 2018 For these requirements, NEC 240.21(C) shall apply for different scenarios depending on the length of the secondary conductors. PAR. FIONE. 1 Apr 2014 Question 20: 240.21(C)(1)(2)&(3) Transformer Secondary Conductors. Question ID#: 2479. Overcurrent protection on the secondary side of a Let's take a closer look at 240.21(C) to help clear up any misconceptions. Basic rules As with feeder taps, from what you see in the NEC. We also described an Some of the key NEC requirements are in NEC 240.21, 450.3 & 695.5.