EC&M’s Electrical Calculations Handbook - Chapter 1 ppsx
EC&M’s Electrical Calculations Handbook - Chapter 1 ppsx
... point method 4 -1 1 Impedance of 600-V, 5-kV, and 15 -kV copper cable 1- 3 7 Impedance of a coil from inductance and resistance 1- 3 5 Inductive reactance from inductance and frequency 4 -1 2 Inductive ... 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 l...
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EC&M’s Electrical Calculations Handbook - Chapter 10 ppsx
... 6.29 H 6.3 6.695 7.09 J 7 .1 7.545 7.99 K 8 8.495 8.99 L 9 9.495 9.99 M 10 10 .595 11 .19 N 11 .2 11 .845 12 .49 P 12 .5 13 .245 13 .99 R 14 14 .995 15 .99 S 16 16 .995 17 .99 T 18 18 .995 19 .99 U 20 29.2 22.39 V ... 2.7 3 10 .6 9.6 4.8 3.9 5 16 .7 15 .2 7.6 6 .1 7.5 24.2 22 11 9 10 30.8 28 14 11 15 46.2 42 21 17 20 59.4 54 27 22 25 74.8 68 34 27 30 88 80 40 32...
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EC&M’s Electrical Calculations Handbook - Chapter 16 ppsx
... 216 , 218 Harmonic-related problems, troubleshooting solutions for, 12 0 Harmonics, 10 4, 11 4, 11 6 Heat flow, from cable, 16 8 Heat loss, from conductor, 14 3 Illuminance, 2 21, 2 31 Impedance, 31, ... voltage distortion (THVD), 11 0, 11 6 Transformer ratings, 256 Transformers, 2 51 impedance % rating, 18 7 K-rated, 11 4 Transient voltage surge suppressors, 208 Trigonometry...
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EC&M’s Electrical Calculations Handbook - Chapter 2 pptx
... voltage - (12 0 12 0 ° = - 12 0 -6 0 ° ) = -( -1 2 0 COS 60 -j 12 0 SIN 60) = -[ ( -1 20)(5) -j (12 0)(.866)] = -[ -6 0 +j 10 3.92] Phase a voltage: 12 0 = 12 0 COS 0 + j 12 0 SIN 0 = [ (12 0) (1) +j (12 0)(0)] 0 ° = ... 3-phase, 4-wire wye 12 470/7200 Volt, 3-phase, 4-wire wye Note 6 24940 /14 400 Volt, 3-phase, 4-wire wye Note 8 34500 /19 920 Volt, 3-phase,...
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EC&M’s Electrical Calculations Handbook - Chapter 3 potx
... 1- 7 . In ac systems that have no harmonic contents 10 8 Chapter Three PULSE #n CHARACTERISTIC HARMONICS (n ± 1) 2 3, 5, 7, 9, 11 , 13 , 15 , 17 , 19 … 6 5, 7, 9, 11 , 13 , 15 , 17 , 19 … 12 11 , 13 , 15 , 17 , ... VECTOR 18 0 - 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 VEC...
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EC&M’s Electrical Calculations Handbook - Chapter 4 potx
... 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 ... 7 5 3 85 65 10 0 75 11 0 85 2 95 75 11 5 90 13 0 10 0 1 110 85 13 0 10 0 15 0 11 5 0 12 5 10 0 15...
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EC&M’s Electrical Calculations Handbook - Chapter 5 potx
... 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 18 1 For example, in a three-phase ... as Let-through power ϭ 10 00 (phase-to-phase kilovolt circuit rating) 2 ᎏᎏᎏᎏᎏᎏ reactor impedance in ohms per phase 1 ᎏᎏᎏ (1/ 385,000) ϩ (1/ 29,630) 1 ᎏᎏ (1/ UP) ϩ (1/ T)...
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EC&M’s Electrical Calculations Handbook - Chapter 6 pdf
... running load is 10 00 kW and a 15 0-hp motor is to be started meanwhile, the minimum kilowatt rating of the generator would be 10 00 kW ϩ 15 0 kW, or 11 50 kW, and the minimum kilovoltampere rat- ing of ... rat- ing of the generator would be 0.5 ϫ [10 00 kW ϩ 6 (15 0)], or 950 kilovoltamperes (kVA). Select a generator set that meets or exceeds both the 11 50-kW and the 950-kVA requireme...
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EC&M’s Electrical Calculations Handbook - Chapter 7 potx
... 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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EC&M’s Electrical Calculations Handbook - Chapter 8 pps
... 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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