EC&M’s Electrical Calculations Handbook - Chapter 14 pps

... Design and Layout Calculations 359 Electrical Design and Layout Calculations 365 Figure 1 4-3 Solve for working space in front of equipment operating at 0–150 V to ground. 368 Figure 1 4-6 Solve for ... interfere with one another? What minimum phase-to-phase and phase-to-ground dimensions must be maintained when con- structing an auxiliary wireway? This chapter provides con- veni...

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... Solve for 1-3 0 Power factor from voltage, current, and true power 1 5-2 2 Present value of maintenance cost 1 4-2 Pull-box dimensions for an angle pull 1 4-1 Pull-box dimensions for straight-through ... prior written permission of the publisher. 0-0 7-1 4148 0-0 The material in this eBook also appears in the print version of this title: 0-0 7-1 3609 5-6 . All tradem...

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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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... 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 ... 1 0-1 0: Continuous-duty motors driving a periodic- duty load (pp. 304 and 305) Figure 1 0-1 1: Continuous-duty motors driving a varying- duty load (pp. 306 and...

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... by The McGraw-Hill Companies, Inc. Click here for Terms of Use. Conversion Calculations Temperature Conversion Calculations While almost all ambient temperatures in electrical engi- neering are ... cross-refer- ence tool from which the conversion can be derived instantly in either direction. Frequently Used Conversion Calculations For work in the electrical industry, many other conv...

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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 ... -j 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, ... (0.576 -j 0.17) x (0.576 -j 0.17) = V; Solve for V. 2. Then, multiply scalars together and add angles. V = (0.6 -1 6.4 ° ) x (0.6 -1 6.4 ° ) V = (0.6 x 0.6) (-1 6.4 ° +...

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... 90 2 1-2 5 7 0-7 7 1.08 1.05 1.04 2 6-3 0 7 8-8 6 1 1 1 3 1-3 5 8 7-9 5 0.91 0.94 0.96 3 6-4 0 9 6-1 04 0.82 0.88 0.91 4 1-4 5 10 5-1 13 0.71 0.82 0.87 4 6-5 0 11 4-1 22 0.58 0.75 0.82 5 1-5 5 12 3-1 31 0.41 0.67 0.76 5 6-6 0 ... 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...

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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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... 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 protection ... the watt load, and the elec- trical dynamo must be sized to allow selected motors to start while other selected electrical loads are in operation. Except in very unusual electrical system...

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