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Motor starters have to be able to switch the necessary power to the motor. Because motors come in many sizes, so do motor starters. NEMA has developed standardized motor starter sizes and a group of horsepower ranges called by numbers Motor Starter Sizes and Ratings Maximum Horsepower Maximum Horsepower Rating—. A 40horsepower, threephase squirrelcage motor is connected to a 208volt line. What are the minimum size NEMA and IEC starters that should be used Another factor that must be considered when installing a motor is the size starter used to connect the motor to the line. Starter sizes are rated by motor type, horsepower, and connected voltage. The two most common ratings are NEMA and IEC Magnetic starters are available
in.many sizes as shown in Table 3–1. Each size has been assigned a horsepower rating that applies when the motor used with the starter is operated for normal starting duty. All starter ratings comply with the Motor Starter Sizes and Ratings Maximum Horsepower Rating–Nonplugging and Nonjogging. Figure 37–34 Table 430.52 is used to determine the size of the shortcircuit protective device for a motor. Reprinted with permission from NFPA Motor Starter Sizes and Ratings Maximum Horsepower Maximum Horsepower Rating—Nonplugging Rating—Nonplugging and Nonjogging Duty and Nonjogging Duty NEMA Load Single Poly NEMA Load Single Poly Size Volts Phase Phase While some motor starters use the same control circuit voltage as the
power.circuit, most do not. starter. sizes. The National Electrical Manufacturers Association (NEMA) has developed standards (rules) to ensure safety and reliability of These starters do not provide protection against inadequate voltage. Magnetic across‐the‐line starting Starter sizes are determined by the voltage and horsepower rating of the motors being controlled. The following chart can be used if the Motors: Starter Sizes Motor starter (controller) sizes are given in Tables 78 Table 710 Advantages and disadvantages of airdriven motors Table 711. and 79. Motors: Useful Equations FullLoad Current, ThreePhase I 1⁄4 0:746 hp 1:73 Thesizes are listed byletter, beginningwithA.There aremore sizes used for
IECstartersthan.NEMA, witha smaller rangeof hp ratings for each(Table 8.3). Table 8.3PartialListing ofIEC Starter Sizes. Size AmpRating(Induction Motors) Maximumhp
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