Refer to Table 240.6 (A) in NEC. The table format for standard fuse and circuit breaker ampere ratings is shown in Table 1. Table 1.
This table is confusing because the first two columns are percentag 240.6 Standard Ampere Ratings 37 (B) Adjustable‐Trip Circuit Breakers The rating of adjustable trip circuit breakers having external means for adjusting the current setting (long‐time pickup setting), not meeting the requirements of 240.6(C), shall be the maximum setting possible. Use NEC 310-16, 75°C, THW, wire #4 wire has 85 amps Use #4 2 #4 and, 1 #4 ground Circuit Breaker Sizing. CB = Load = 65.2 Amp = 81.5 Amp.8 .8. Next higher CB size is 90 Amp. NEC 240-6 and 240-3 exception 1, conduit-size, 3 #4 in conduit Table 3A = 1" conduit which allows 3 #4 maximum in a 1" conduit. Example: 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.
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Figure-3: NEC Table 240.6 (A) Standard Ampere Ratings for Fuses and Inverse Time Circuit Breakers Standard fuses and circuit breaker sizes can be found in NEC 240.6 (A). All other motors other than ones with a nameplate of 1.15 or more or with a nameplate temperature rise of 40°C shall have the overload device sized at no more than 115% of the motor’s FLA. An example calculation to size a motor overload protection device is: The next higher standard rating of overcurrent device listed in 240.6(A) (above the ampacity of the ungrounded conductors being protected) is permitted, provided all of the following conditions are met: (1) The conductors aren’t part of a branch circuit supplying more than one receptacle for cord-and-plug-connected loads. Service size = 27,400/240 = 114Amps. From the standard ampere rating in NEC® 240.6, a 125amp breaker is adequate for the service size. Optional Multi-Dwelling Calculation Before using the Optional Calculation for three or more units, the designer must ensure that each unit is fed by a single feeder, contain cooking provisions, and have an air Tap conductor definition from 240.2 of the National Electrical Code (NEC), 2014 edition Before discussing how to apply the tap rules, we must know what a tap conductor is. NEC says it is: “A conductor, other than a service conductor, that has overcurrent protection ahead of its point of supply that exceeds NEC 240.6 (B) (C)/Service Disconnectin Means NEC 240.6 (B) (C)/Service Disconnectin Means If you read NEC section 240.6 (C), and you have restricted access, the rating of the service disconnect does change if you adjust the trip setting.
Standard fuses and circuit breaker sizes can be found in NEC 240.6 (A). All other motors other than ones with a nameplate of 1.15 or more or with a nameplate temperature rise of 40°C shall have the overload device sized at no more than 115% of the motor’s FLA. An example calculation to size a motor overload protection device is:
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To size the branch-circuit conductor for a motor, refer to the requirements in 430.22 and Tables 310.16 and 430.150. To size the branch-circuit protection for a motor, refer to 240.6 (A), 430.52 (C), and Table 430.150. If you're using motor controls, size and protect the motor control circuit conductors per 430.72.
Select fuse from NEC Table 240-6 below. Where Imax falls between two fuse ampere ratings NEC 430-53 (c) permits going to the next high ampere rating.
Use Page 70-57"9, or Tables 4 and 5 if wires are all different size.
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Next higher CB size is 90 Amp. NEC 240-6 and 240-3 exception 1, conduit-size, 3 #4 in conduit Table 3A = 1" conduit which allows 3 #4 maximum in a 1" conduit.
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Ungrounded Conductors. NEC 240.21.
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sized we must refer to Article 430.27 in the NEC which states the 240.6. 400. 400. 400. 125. 150.4. 4/0. 250. 400. 125. 300.7. (2)4/0. 500. 600. 150. 180.4. 250.
See the actual NEC text at NFPA.ORG for the complete 240.6(C) Restricted Access Adjustable-Trip Circuit Breakers. A circuit breaker(s) that has restricted access to the adjusting means shall be permitted to have an ampere rating(s) that is equal to the adjusted current setting (long-time pickup setting). Restricted access shall be defined as located behind one of the following: 2017 NEC Chapter 2 – Wiring and Protection.