You have a three wire secondary. You cannot use 240.21 (C) (1). "Conductors supplied by the secondary side of a single-phase transformer having a 2-wire (single-voltage) secondary" He has the two secondary coils connected in parallel, it is being used as a single voltage secondary.

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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. Refer to the NEC® for a complete list and for other sections and articles that may be relevant. 240.5. Protection of Flexible Cords, 240.21. Location in Circuit.

Mike Holt Enterprises offers comprehensive electrical exam prep materials delivered in Se hela listan på ecmweb.com 4. Location of overcurrent protection NEC 240.21 basically says that – conductors must have overcurrent protection at their point of supply except as permitted in NEC 240.21 (A) through (H). Note that for feeder taps, rules (B)(1) through (5) are applicable. Also note that these rules are not about whether or not 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 overcurrent protection is not required at all! 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.

2002-03-26

This revision to 240.21(B)(1) was meant to clarify the application of the previous requirement for 3.0 m (10 ft) or less feeder taps and to state the specific type of “device” as an overcurrent device. This clarification was needed since somethingas simple as a conductor would fit within the 2011 NEC New Article 409 for the 2005 NEC requires that either a single OCPD be located ahead of an Industrial Control Panel, or a Main CB (i.e., ONE CB) be located within the Industrial Control Panel. But 409.21 states that this protection shall be provided in accordance with 240.21 Parts I, II, and IX. Download this FREE PDF of 240.21(A) and 240.21(B) and get the most-up-to-date information regarding feeder taps directly from the 2014 NEC® Handbook. NEC Article 430 .

present in NEC Section 240-21 based upon distance. Conclusion: Proper panelboard protection and application is essential to electrical distribution system design. 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

Is a service receptacle required in a furnace room located in the middle of a 24 Aug 2016 NEC Code Making Process Where to Keep Abreast of the Latest NEC Information 240.21(B)(4) Applies to High Bay Manufacturing Areas The National Electrical Code Article 240-21 details specific tap rules that should be considered before installation. NEC 240.21 Location in Circuit. Over current 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 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).

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.” 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. The 2005 Code has modified the manner that these secondary conductors minimum ampacity is determined.
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240.5.

Grounding Separately Derived Alternating-Current Systems* NEC 250.30 (B)(1) Grounding Electrode Conductor.
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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

(or Part VIII of Article (NEC 240.21 B). 18. Provide a note stating that any conductors exposed to sunlight shall be listed as sunlight resistant. (NEC 300.6 C1, 310.8 D). Master The NEC Enjoy this graphic on Transformer Secondary Conductor rules in 240.21(C)(6). P.S.- If you do not like itLOL..Make Your Own!..

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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

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 overcurrent protection is not required at all! Battery conductors, for which you install the OCPDs as close as practicable to the battery terminals 240.21 (H)]. OCPDs must be readily accessible [240.24 (A)]. Install them so the center of the grip of the operating handle, when in its highest position, isn’t more than 6 ft, 7 in. above the floor or working platform.

NEC Section 240-21(c)(1) states that overcurrent devices are not required on the secondary of a single phase 2-wire or three phase, three wire, delta-delta transformer to provide conductor protection where all of the following are met: (1) The transformer is protected in accordance

NEC 240.21 Location in Circuit. Overcurrent protection shall be provided in each ungrounded circuit conductor and shall be located at the point where. 31 Jul 2017 C – NEC Section 240.21(B)(2) requires that feeder tap conductors must not be over 25 feet in length and the ampacity of the tap conductor must 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. 27 Aug 2018 In-Line Fuse permissible? NEC Code Forum. 2; 930.

NEC 430.53 (D) addresses the conductor sizes used in group motor installations and is the starting point for compliance. It applies in all cases for all group motor installations. 1. NEC 430.53 (A) addresses installations where all of the motors are rated 1 hp or less. 2. NEC 430.53 (B) addresses installations where the smallest This section consists of NEC free online practice tests These tests helps in preparing for Journeyman and Master electrician License exams Enjoy free tests.. 240.21(B)(1) Feeder Taps Not over 3 m (10 ft) Long.