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.

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!

above the floor or working platform. Exceptions exist in 240.21 (A) through (G). Here's a summary of each of these, but be sure to read the details if the exception applies to your situation. (A) Branch circuits meeting 210.19 requirements are exempted from 240.21 location requirements. Examples include multiwire and range circuits. Similar to feeder taps, covered in the last issue, transformer secondary conductors can be every bit as confusing.

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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! 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)].

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Apr 27, 2019 So looking at NEC 240.21 if I'm reading it correctly, I can use the sub feed lug kit to tap off my main panel, run power out the garage, and use a 

NEC 430.22. Single Motor* NEC 430.24. Several Motors or a Motor(s) and Other Load(s)* NEC 430.25. Multi motor and Combination Load Equipment* NEC 430.31.

of the battery cabinet, racks, or trays, (NEC 480.9, 110.26) storage battery terminals in accordance with the requirements of NEC Article 240, (NEC 240.21( H),.

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. 240.5. Protection of Flexible Cords, 240.21. Location in Circuit. 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.

These rules are often referred to as the NEC “tap rules”. 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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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). 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. Before we get into the details of 240.21, you must understand that a tap conductor isn't permitted to supply another tap conductor. You have a three wire secondary.

If the cable system is inadequate, unsatisfactory operation inevitably results. 2002-09-06 Code reference: 240.21 NEC 240.21 “Location in Circuit” requires an overcurrent protective device “at the point where the conductors receive their supply”.
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NEC 240.21 Overcurrent devices are readily accessible and not exposed to physical damage. NEC 240.24(A); 240.24(C) Overcurrent devices are not installed in bathrooms, over steps, or in the vicinity of ignitable material. NEC 240.24(D); 240.24(E); 240.24(F) Overcurrent devices are accessible to all occupants. NEC 240.24(B)

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. Se hela listan på ecmweb.com Visit http://www.MikeHolt.com/examprep to explore our product catalog.

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 

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. NEC 240.21, with some exceptions, requires overcurrent protection in each ungrounded conductor to be located where the conductors connect to the load. Section 240.21 contains tap conductor rules and states overcurrent protection shall be provided in each ungrounded circuit conductor and shall be located where the conductors receive theirsupply except as specified in 240.21(A) through (H), which covers branch-circuit taps, feeder taps, transformer secondary conductors, service conductors, busway taps, motor-circuit taps, conductors from requirements of 240.21, a short-circuit protection analysis of the tap conductor should also be done per NEC 110.10. The primary applications of interest to most include feeder taps per 240.21(B) and transformer taps per 240.21(C).

NEC 240.24(B) The NEC “tap rule” allows for a smaller “tap wire” to be run from the larger bus to the TVSS. In keeping with the desire to minimize the length of this connection, the “10’ tap rule” Article 240-21 generally applies. A tap connection can only be made where the current rating of the tap connection to the TVSS is greater than 1/10 of 2015-06-12 NEC 240.21. Location in Circuit. NEC 240.23. Change in Size of Grounded Conductor* NEC 240.30.