EC&M’s Electrical Calculations Handbook - Chapter 10 ppsx

... 289 300 Figure 1 0-8 : Continuous-duty motors driving a continu- ous-duty load (pp. 300 and 301) Figure 1 0-9 : Continuous-duty motors driving an inter- mittent-duty load (pp. 302 and 303) Figure 1 0-1 0: Continuous-duty ... 211 192 96 77 100 273 248 124 99 125 343 312 156 125 150 396 360 180 144 200 528 480 240 192 Figure 1 0-6 Table of full-load currents for three-phase ac inductio...

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... Selection 170 Chapter 5. Short-Circuit Calculations 179 Sources of Short-Circuit Current 182 The Ability of the Electrical Utility System to Produce Short-Circuit Current 183 Short-Circuit Contributions ... capacitance, and resistance 1-1 1 dc current in series circuit 1-1 2 dc voltage from voltage and resistance 1 0-7 Disconnecting means for motor given horsepower and locked-r...

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... correct coefficients to pre- cede each unit value. 1 barrel ᎏ hour 55 gal ᎏ barrel $10 ᎏ gal 1 barrel ᎏ hour 55 gal ᎏ barrel $10 ᎏ gal Conversion Calculations 431 Figure 1 6-2 (Continued) Symbols, ... 14 Battery voltage, 4 Bill, electrical utility, 90 Box sizing, pull, 357 Bus bars, 132 Capacitance and voltage, 100 Capacitor bank, 103 Capacitor bank detuning, 108 Capacitors, 4...

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... Volt, 3-phase 4-wire wye Note 5 460 Volt, 3-phase 3-wire delta Note 4 600/347 Volt, 3-phase, 4-wire wye 2400 Volt, 3-phase, 3-wire delta 2400 Coltm 3-phase, 4-wire wye 4160/2400 Volt, 3-phase, 4-wire ... 104 = (180) 2 + (104 ) 2 Minus Phase b voltage - (120 120 ° = - 120 -6 0 ° ) = -( -1 20 COS 60 -j 120 SIN 60) = -[ (-1 20)(5) -j (120)(.866)] = -[ -6 0 +j 103 .92]...

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... VECTOR 180 - 37.4° AMP 20.9 -1 6.6 +j 12.7 (-X, +J) (+X, +J) (-X, -J) (+X, -J) Step 3. Draw the resultant vector. +X +J -J (-X, -J) NEW RESULTANT VECTOR -1 6.6 +j 12.7 180 ° - 37.4 ° AMP 20.9 (-X, ... multiplied by another vec- tor in polar form, the scalar numbers are multiplied togeth- er and the angles are added in this way: (100 ∠ 10 ) (10 ∠ 20°) ϭ (100 0 ∠ 30°) See Fig...

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... REMARKS 31 0-1 6 OR 31 0-1 7 31 0-1 6 OR 31 0-1 7 UNDERGROUND FEEDER CABLE 31 0-1 6 OR 31 0-1 7 MOISTURE AND HEAT RESISTANT 31 0-1 6 OR 31 0-1 7 31 0-1 6 OR 31 0-1 7 WITH A NYLON PROTECTIVE LAYER 31 0-1 6 OR 31 0-1 7 FLAME ... FLAMEPROOF 31 0-1 6 OR 31 0-1 7 HEAT RESISTANT, WITH A NYLON PROTECTIVE LAYER 31 0-1 6 OR 31 0-1 7 31 0-1 6 OR 31 0-1 7 RATED FOR 90...

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... electrical systems against damage during short-circuit conditions is required by the National Electrical Code (Secs. 11 0-9 and 11 0-1 0). Short-Circuit Calculations 181 For example, in a three-phase ... 30-MVA generator 3. The 5000-hp motor 4. The motors connected to the 480-V bus Short-Circuit Calculations 191 Figure 5-1 Electrical power system one-line drawing for short-cir...

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... running load is 100 0 kW and a 150-hp motor is to be started meanwhile, the minimum kilowatt rating of the generator would be 100 0 kW ϩ 150 kW, or 1150 kW, and the minimum kilovoltampere rat- ing of ... power conductors and generator overcurrent pro- 200 Chapter Six Gas-turbine generators arrive at the installation site prepackaged on skids. Figure 6-2 Solve for generator overcurrent...

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... such as a 460-volt (V), three-phase, three-wire delta system, an arc- ing fault that repeatedly restrikes can cause voltage “jack- ing” of up to six times the normal system phase-to-neutral voltage. ... enough equipment-grounding conductors, as shown in Fig. 7-4 . Since system grounding is done at the service-disconnect- ing means, the equipment-grounding conductor and the neu- tral (“groun...

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... necessary to use the point-by-point method. The Point-by-Point Method How to make point-by-point calculations Later in this chapter, lighting calculations within areas hav- ing reflective surfaces, ... footcandles from the second luminaire. Sample point-by-point lighting calculations Refer to Fig. 8-1 for sample point-by-point lighting calcula- tions for both the nadir point and a po...

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