Ugly's Electrical References, 2014 Edition by Jones & Bartlett Learning
By Jones & Bartlett Learning
Ugly's electric References, 2014 variation is designed for use as an on-the-job reference. Used around the globe through electricians, engineers, contractors, designers, upkeep staff, teachers, and the army; Ugly's includes the main regularly required electric details in an easy-to-read and easy-to-access layout. Ugly's provides a succinct portrait of the main pertinent info all electricians desire at their fingertips, together with: mathematical formulation, nationwide electric Code tables, wiring configurations, conduit bending, voltage drops, and life-saving first relief tactics
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Additional info for Ugly's Electrical References, 2014 Edition
7(B), as modified. The National Electrical Code ® requires that all alternating-current motors rated 1 ⁄2 horsepower or more (except for polyphase wound-rotor motors) must have code letters on their nameplates indicating motor input with locked rotor (in kilovolt-amperes per horsepower). If you know the horsepower and voltage rating of a motor and its “Locked KVA/Horsepower” (from the above table), you can calculate the locked-rotor current using the following formulas. 73 Example: What is the maximum locked-rotor current for a 480-volt, 25-horsepower, code letter F motor?
Addition of running winding 2. Two starting windings and two running windings 3. Consequent pole connections 36 SINGLE-PHASE MOTORS Split-Phase, Squirrel-Cage Motor A. RESISTANCE START: T8 T1 L1 STARTING WINDING RUNNING WINDING L2 TO LINE T4 CS RESISTANCE T5 Centrifugal switch (CS) opens after reaching 75% of normal speed. T1 T5 T4 T8 T1 CLOCKWISE L1 L2 L1 T5 T4 L2 T8 COUNTERCLOCKWISE B. CAPACITOR START: T8 T1 L1 L2 TO LINE STARTING WINDING RUNNING WINDING T4 CAPACITOR T5 CS NOTE: 1. A resistance start motor has a resistance connected in series with the starting winding.
99 Kilovolt-Ampere/ Code Horsepower with Letter Locked Rotor L . . . . . . 99 M . . . . . 19 N . . . . . 49 P . . . . . 99 R . . . . . 99 S . . . . . 99 T . . . . . 99 U . . . . . 39 V . . . . . 7(B), as modified. The National Electrical Code ® requires that all alternating-current motors rated 1 ⁄2 horsepower or more (except for polyphase wound-rotor motors) must have code letters on their nameplates indicating motor input with locked rotor (in kilovolt-amperes per horsepower).