By Jones & Bartlett Learning
Ugly's electric References, 2014 variation is designed for use as an on-the-job reference. Used world wide via electricians, engineers, contractors, designers, upkeep employees, teachers, and the army; Ugly's comprises the main quite often required electric info in an easy-to-read and easy-to-access structure. Ugly's offers a succinct portrait of the main pertinent details all electricians desire at their fingertips, together with: mathematical formulation, nationwide electric Code tables, wiring configurations, conduit bending, voltage drops, and life-saving first reduction techniques
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Ugly's electric References, 2014 variation is designed for use as an on-the-job reference. Used around the world by way of electricians, engineers, contractors, designers, upkeep staff, teachers, and the army; Ugly's comprises the main as a rule required electric details in an easy-to-read and easy-to-access structure.
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Extra resources for Ugly's Electrical References, 2014 Edition
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). 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.
51 VOLTAGE DROP CALCULATION EXAMPLES Single-Phase Voltage Drop What is the voltage drop of a 240-volt, single-phase circuit consisting of #8 THWN copper conductors feeding a 30-ampere load that is 150 feet in length? 9% Voltage at load = 240 volts - 7 volts = 233 volts Three-Phase Voltage Drop What is the voltage drop of a 480-volt, 3-phase circuit consisting of 250-kcmil THWN copper conductors that supply a 250-ampere load that is 500 feet from the source? 29% Voltage at load = 480 volts - 11 volts = 469 volts NOTE: Always check ampacity tables for conductors selected.
73 Example: What is the maximum locked-rotor current for a 480-volt, 25-horsepower, code letter F motor? 8(C). 251(A), as modified. 8 93 116 146 174 232 290 348 434 580 726 868 1160 * Design A motors are not limited to a maximum starting current or locked-rotor current. 8(C). 251(B), as modified. 44 THREE-PHASE AC MOTOR WINDINGS AND CONNECTIONS 1. 1. 4. 7. 4. 7. 9. 6. 8. 9. 6. 5. 5. 8. 3. 2. "Y" OR STAR 3. 2. DELTA HIGH VOLTAGE HIGH VOLTAGE 6 5 4 4 9 9 8 7 8 5 7 3 2 1 2 3 1 T-3 T-2 T-1 T-2 T-3 T-1 6 LOW VOLTAGE LOW VOLTAGE 6 5 4 4 9 9 8 7 8 5 7 3 2 1 2 3 1 T-3 T-2 T-1 T-2 T-3 T-1 6 NOTE: 1.