NEC 240.4 requires the branch circuit, feeder, and service conductors to be protected against overcurrent in accordance with their ampacities as specified in 310.15. 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:

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 …

Protection of Conductors*. NEC 240.6. Standard Ampere Ratings. NEC 240.13. Ground Fault Protection of Equipment*. NEC 240.15.

Nec 240.4

2017-10-04 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. one, unless listed for more (2017 NEC: 110.3(B)) The maximum number of Type NM cables that can be inserted into a connector is ___. Article 240 in the National Electrical Code (NEC) provides general requirements for overcurrent protection and overcurrent protective devices. When sizing conductors, the rating of the overcurrent device must be considered.

NEC 240.4 requires the branch circuit, feeder, and service conductors to be protected against overcurrent. This is in accordance with their ampacities as specified in 310.15. 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:

Unless specifically permitted in 240.4(E) or (G), the overcurrent protection shall not exceed that required by (D)(1) through (D)(7) after any correction factors for ambient temperature and number of conductors have been applied. NEC 240.4 requires the branch circuit, feeder, and service conductors to be protected against overcurrent. This is in accordance with their ampacities as specified in 310.15. 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: 240.4(D) Small Conductors 33 Unless specifically permitted in 240.4(E) (tap conductors) or (G) (See Specific conductors: table 240.4(G) , the overcurrent protection shall not exceed that required by (D)(1) through (D)(7) (See NEC) afterany correction factors for ambient temperature and number In the 2017 NEC, the paragraph was turned into new Table 240.6(A).

Article 240 in the National Electrical Code (NEC) provides general requirements for overcurrent protection and overcurrent protective devices. When sizing conductors, the rating of the overcurrent device must be considered. In accordance with 240.4, conductors (other than flexible cords, flexible cables and fixture wires) shall be protected against overcurrent in accordance with their

There are often several related tables and information for other configurations and applications. 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.

Small Appliance and Laundry Loads: Dwelling Unit Adapted from NEC® Tables 310.15(B)(17) and 310.15(B)(2)(a).
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Jun 26, 2006 Found that it seems you are allowed to use the full 25A rating for 12-2 NM cable ( NEC Table 310.16) in certain cases (NEC 240.4.G) which 09 NEC 240.4 Conductors shall be protected in accordance with their ampacity per Table 310.15(B)(16) and 240.4(D).

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Once there, click on their link to free access to the 2017 NEC edition of NFPA 70. 2014 Code Language: The ungrounded and grounded circuit conductors of each multiwire branch circuit shall be grouped by cable ties or similar means in at least one location within the panelboard or other point of origination.

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. 240.5. Protection of Flexible Cords, Flexible Cables, and Fixture Wires.

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(B) Feeder Taps. Taps can be made at conductors without overcurrent protection at the tap as noted in section 240.21(B)(1) through (5) below. The provisions of 240.4(B) cannot be applied for tap conductors. (1) Taps Not over 3 m (10 Feet) Long. The rating of the overcurrent device must be considered when sizing a conductor.

These include fire pumps (A), tap conductors (F), and an extensive table of specific conductor applications (G). NEC 240.4 requires the branch circuit, feeder, and service conductors to be protected against overcurrent in accordance with their ampacities as specified in 310.15. 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.