Motor breaker size calculator
How do I choose a breaker size?
Select motor size from horsepower column making certain you are in the correct voltage. Select fuse or breaker size from column 3 or 4. Read horizontally to the right until the distance is as great or greater than your installation distance. Go vertically to the head of that column for the recommended wire size. NOTE!!
How much fuses can be sized in a motor?
Based on NEC® requirement limiting the rating of time-delay fuses to 175% of motor F.L.A., or next higher rating. Based on NEC® exception permitting fuse rating to be increased, but not to exceed, 225% motor F.L.A., however per NEC® Article 430.52 Class CC (0-30) fuses can now be sized up to 400% of motor F.L.A.
How do I choose a wire size for my motor?
Read horizontally to the right until the distance is as great or greater than your installation distance. Go vertically to the head of that column for the recommended wire size. NOTE!! If the motor is required to start under a heavy load, we recommend using one size larger wire.
What size conductor should a motor feeder have?
Conductors may be either one 500 kCM or two No. 3/0 AWG per phase (one 500 kCM = 380 amps, two No. 3/0 = 400 amps). NEC paragraphs 430-62 (a) and (b) cover the requirements for sizing the motor feeder short circuit and ground fault protection.
[PDF File]Motor Circuit Protection Tables - Eaton
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Various fuse types are listed in Column 3. The LPJ_SP is a 600Vac, 0 - 600 amp, time-delay, Class J, “Low-Peak fuse, with a 300,000 amp interrupting rating. The TCF is a 600Vac, 1 - 100 amp dual-element, time-delay, IP-20 finger-safe fuse with Class J performance.
[PDF File]MOTOR PROTECTION TABLES - Littelfuse
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Locate motor nameplate FLA in the column appropriate for the type of motor and type of protection required. Then select the corresponding ampere rating of the fuse from the first column of that line. Motor Protection White Paper Download our white paper on motor protection at littelfuse.com/technicalcenter
[PDF File]MOTOR HP & AMPS ELECTRICAL WIRE, FUSE & BREAKER SIZES
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The following table gives wire, breaker and fuse sizes based on horsepower, voltage and phase. Motor full load amps are taken from motors currently used by Champion. The wire, breaker and fuse sizes are provided as a reference for the installer and are based on the 1996 National Electrical Code.
Motor Circuit Protectors Motor Protection Selection Tables
energy efficient motor, the switch is required by NEC 430.109 to have a hp rating of not less than 1.4 times that of a motor rated 3–100 hp, or not less than 1.3 times that of a motor rated over 100 hp. Switches shown in this table do not necessarily comply with that requirement. hThermal-magnetic circuit breaker ampere ratings recommended are
[PDF File]HOW TO CALCULATE WIRE AND FUSE SIZES FOR ELECTRIC MOTORS
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CHART TO DETERMINE FUSE / BREAKER AND WIRE SIZES FOR ELECTRIC MOTORS (For single phase A.C. motors only) 1. Select motor size from horsepower column making certain you are in the correct voltage. 2. Select fuse or breaker size from column 3 or 4. 3. Read horizontally to the right until the distance is as great or greater than your installation ...
[PDF File]Appendix 9C: Design Calculations for Electrical Design
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NEC Article 430 includes tables for motor full-load currents, which are the minimum values that can be used in determining sizes of motor branch circuits, motor feeders, short circuit and overcurrent device sizes and settings, and miscellaneous load calculations.
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