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 240.24(D) & (E) – Overcurrent devices (breakers/fuses) shall not be located in bathrooms or clothes closets. ___ NEC 240.4 – Conductors shall be

Motors. Don't confuse motor circuit protection with motor overload protection. The rating of the overcurrent device must be considered when sizing a conductor. In accordance with 240.4 in the National Electrical Code (NEC), 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). 240.4. Protection of Conductors. Refer to the NEC® for a complete list and for other sections and articles that may be relevant.

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). • OCPDs rated over 800A . According to NEC table 310.16 the ampacity of No. 14 AWG is 20A at 75'C. However, NEC 240.4 (D) (2) state's that 14 AWG must be protected at 15A. According to 240.4 (B) the next higher standard OCPD is permitted to be used under certain conditions.

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.

Note: NEC 240.4(C) Where the over current device is rated over 800 amperes, the ampacity of the conductors it protects shall be equal to or greater than the rating of the overcurrent device defined in 240.6.

square footage of the dwelling. Note that NEC 240.4(E)(3) doesn’t waive the overcurrent protection requirements; it only specifies the location requirements of the required overcurrent protection.

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

The Quick start function starts projection a mere 3 seconds after the power is switched on Section 240.4(D)(7) in the NEC ® tells us that, in general, the maximum overcurrent protection permitted for a 10 AWG copper conductor is ___ amperes.

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 240.4(F) verifies that the primary overcurrent device does not protect the secondary conductors in most cases. 3.) NEC 240.21 does not “undo” any of the overcurrent protection requirements of 240.4, it just moves the overcurrent device location from where the conductors receive their … Note: NEC 240.4(C) Where the over current device is rated over 800 amperes, the ampacity of the conductors it protects shall be equal to or greater than the rating of … Visit http://www.MikeHolt.com/code to explore our product catalog. Mike Holt Enterprises offers comprehensive electrical training materials delivered in a lo Chapter 4 NEC & NEMA Standards 3 Table 310.16 Allowable Ampacities of Insulated Conductors Rated 0 Through 2000 Volts, 60°C Through 90°C (140°F Through 194°F), Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried), Based on Ambient Temperature of 30°C (86°F) 2012-06-21 Once there, click on their link to free access to the 2017 NEC edition of NFPA 70. 2014 Code Language: 210.4(D) Grouping.
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(Aluminium kan utgöra problem vid fastsättning på Närmsta högre standardmärkström kan användas upp till max 800 A under vissa förutsättningar som anges i NEC 240.4(B). Säkringen ska inte belastas The views expressed in this report are those of the authors and do not nec Senast ändrad: Senast ändrad: 15 april 2011 - Storlek: 240.4 kB.
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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-

Motors. Don't confuse motor circuit protection with motor overload protection.