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!
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
240.6. Taps can be made at conductors without overcurrent protection at the tap as noted in section 240.21(B)(1) through (5) below. 2017-10-04 NEC 240.21, with some exceptions, requires overcurrent protection in each ungrounded conductor to be located where the conductors connect to the load. True False: False : 2. NEC 240.21(C)(6) only requirements are restricting the maximum length of the secondary conductors to 25 feet in addition to the following conditions, (1) the secondary conductors must have an ampacity that is equal to or greater than the ratio of New in the 2002 NEC for transformer secondary conductors is 240.21(C)(6), which will now clearly permit a 25-foot transformer secondary conductor taps in a commercial installation. As the submitter of this proposal pointed out in his substantiation, the only 25-foot tap rule for transformer secondary conductors in the 1999 NEC existed in 240-21(c)(3) for “industrial installations only.” 2015-04-05 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.
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. 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.
NEC 2014 edition electrical code tap rules The NEC article dealing with overcurrent protection of feeder taps is article 240.21(B).
Code reference: 240.21 NEC 240.21 “Location in Circuit” requires an overcurrent protective device “at the point where the conductors receive their supply”. NEC 240.21(C) allows the omission of overcurrent protection at the secondary of the transformer if the rules in 240.21(C)(1) through (C)(6) are followed.
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 in the general taps rules found in NEC 240.21.
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
Per NEC 240.21, 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) true or false 10.The NEC permits a set of conductors feeding a single load, or each set of conductors feeding separate loads, to be connected to a transformer secondary without overcurrent protection at the secondary, as specified in ? a.
[NEC 110.26]
NEC 240.21, with some exceptions, requires overcurrent protection in each ungrounded conductor to be located where the conductors connect to the load. 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,. 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.
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or less (distance between SES and first overcurrent device), conductors shall be sized per 2014 NEC Art 240.21(B)(1). 3. For Tap Conductors 25ft.
NEC 240.21. Location in Circuit.
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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
NEC 240.21(C) allows the omission of overcurrent protection at the secondary of the transformer if the rules in 240.21(C)(1) through (C)(6) are followed. Per NEC 240.21, 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) true or false in the general taps rules found in NEC 240.21. 8502DB0701 Group Motor Installations: 09/2007 Understanding NEC 430.53 Requirements In the 2017 NEC, 690.9(A) consisted of one paragraph with two exceptions. For the 2020 NEC, most of the same requirements remain in place but are stated in three separate list items and the language adds clarity. The NEC “tap rule” allows for a smaller “tap wire” to be run from the larger bus to the TVSS.
NEC 240.21 Location in Circuit. Over current 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 (G). No conductor supplied under the provisions of 240.21(A) through (G)
Before we get into the details of 240.21, you must understand that a tap conductor isn't permitted to supply another tap conductor.
○ Conductors shall be permitted to be tapped, without overcurrent protection at the tap, to a feeder as specified in. 240.21(B)(1) through 10 Jun 2019 2. For Tap Conductors 10 ft. or less (distance between SES and first overcurrent device), conductors shall be sized per 2014 NEC Art 240.21( References are to CID Rules NMAC or 2011 NMEC/NEC. 1. Professional Seal Load Calculations. NMAC 14.5.2.10 A, H, & K; NEC 220.1 NEC 240.21.