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Section 240.4 (A) through (G) contains rules that modify the general requirement and permit conductors to be protected in a manner other than their ampacities from 310.15, including: What I don't get it is how can #2/0 wires are OK to be protected by a 200A breaker when a combination of 240.4(B)(2) and table 240.6(A) states otherwise. Also 310.12 doesn't exist in NEC 2017 and the OP post pertains only to NEC 2017. 240.4 (B) is not the only oddity you can find. You might want to look at table 310.15 (B) (6) where the NEC allows the use of smaller then normal conductors for services and 230.90 (A) Exception 3 where the NEC allows service conductors to be 'protected' far above their rating providing the calculated load is under the conductor amapcity. 240.4(E) through (G), the overcurrent protection shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amoeres for 10 AWG aluminum after any correction.
NEC 240.4 Protection of Conductors Conductors, other than flexible cords, flexible cables, and fixture wires, shall be protected against overcurrent in accordance with their ampacities specified in 310.15, unless otherwise permitted or required in 240.4(A) through (G). NEC 240.4 (D) Small Conductors NEC 240.4(A) does not require conductor overload protection for fire pump circuits (see figure 5). NEC 240.4(B) (2005 edition) allows the next higher standard OCPD rating (above the ampacity of the conductors being protected) to be used for OCPDs that are 800 A or less if the conductor ampacity does not already correspond to a standard OCPD size and if certain other conditions are met (see NEC 210.11 General Circuitry central heating equipment One separate, individual branch circuit for central heating equipment. NEC 210.11 General Circuitry kitchen Two 20-amp circuits for the kitchen receptacles. NEC 210.11 General Circuitry laundry One 20-amp circuit for the laundry receptacles.
dina 12AWG THHNs tar upp 8,581mm2 styck (dessa siffror kommer från NEC anges i NEC 2002, får överströmsskyddet inte ställas högre än 15 A för AWG 14, 20 A för AWG 12 och 25 A för AWG 10. Se artikel 240.4(D) 9 Kontakta CHS NEC 240.4 Protection of Conductors Conductors, other than flexible cords, flexible cables, and fixture wires, shall be protected against overcurrent in accordance with their ampacities specified in 310.15, unless otherwise permitted or required in 240.4 (A) through (G). If you meet the three requirements of 240.4(B), you can use the next higher standard rating of OCPD listed in 240.6 (above the ampacity of the ungrounded conductors being protected).
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Dies gilt auch für alle anderen als die oben genannten Anwendungsfälle. Dec 19, 2011 NEC 240.4(G) applies to overcurrent protection for specific applications and sends you to Table 240.4(G) where you find, first in the list, air- NEC 240.21, with some exceptions, requires overcurrent protection in each conductors that is protected as described elsewhere in 240.4 best describes ?
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/==/ NEC Nemilicherry Halt.
The Table refers us to Article 440 Parts III & IV. Answer: Thank you for your interest and response to the Code Question of the Day. You are absolutely correct in your statement that NEC 240.4(F) and 240.21(C)(1) both say that the “secondary conductors” of the transformer addressed in our question cannot be considered, to be protected by the primary overcurrent protective device. ___ NEC 230.70(A)(2) – The service disconnecting means shall not be located in a bathroom. ___ NEC 240.24(D) & (E) – Overcurrent devices (breakers/fuses) shall not be located in bathrooms or clothes closets. ___ NEC 240.4 – Conductors shall be protected against overcurrent in accordance with their ampacities specified Se hela listan på electrical-engineering-portal.com 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 See 110.14(C), 240.4(D) and 310.15(B) for other limitations where applicable. For equipment marked for use at higher temperatures, the conductor ampacity shall be limited to the following per NEC 110.14(C): NEC 240.4(B) exception allows rounding to next highest breaker size if wire ampacity is in between breaker sizes.
Oct 2, 2019 DC optimizers are properly grounded [NEC 690.43 and NEC 110.3(B)] The OCPD is sufficient to protect the circuit conductors [NEC 240.4]. 009 NEC 210.12 All branch circuits supplying 125-volt, 15- and 20- amp outlets or 014 NEC 240.4 Conductors shall be protected in accordance with their
OVERCURRENT DEVICE. SIZING PER NEC 240.4(B) AND 240.6(A): 705.22 AND THE OPERATING VOLTAGE PER NEC 690.54. AV4. LELUYbi.
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Motors. NEC 220.51. Fixed Electric Space Heating. NEC 220.52.
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NEC 314.29 Junction boxes shall be installed so that the wiring contained in them NEC 240.4 Conductors shall be protected in accordance with their ampacity NEC 240.4. Protection of Conductors*. NEC 240.6. Standard Ampere Ratings.