· xls file · web view · 2003-04-30multiplier for ds from table vii...
TRANSCRIPT
Sheet1
Page 1
Conductors in Raceway in Free AirLocked cells are in colorVariable cells are whiteInsulation Thickness from NEC Table 310-13Conductor Diameter from NEC Table 8 Chapt 9DI outside conductor DiameterInsulation Degrees C - cm / WattRI Conductor Insulation Thermal Ohm Feet
Number of ConductorsFactor A' from Table VII N-MFactor B' from Table VII N-MMultiplier for Ds from Table VII NotesDI (conductor diameter from above)Ds (multiplier x DI))RsdCalculation of Rd for duct wallThermal Conductivity in W / m-C (71 for iron, 130 for Al, and 0.16 for PVC)t thickness of duct wallDuct wall thermal resistance in C -cm / WattOutside Diameter of Duct or racewayRd thermal ohm feet calculationDs' (conduit O.D.) from manufacturee (emissivity)N (number of conductors)Re
RCA (Sum of Ri + Rsd +Rd+ Re)Circular mil area for calculating resistance using NMCircular mil ohms per foot at 75 degrees C. (enter 12.9 for copper and 21.2 for aluminum)RDC Calculated using NM for Temperature TC75 degree C. AC Resistance from NEC Chapter 9 Table 9 Cols 4-6 Reference75 degree C. DC Resistance from Chapter 9 Table 8 ReferenceAC/DC Ratio from Standard Handbook for Electrical EngineersAC Resistance corrected for temperature
TC (maximum insulation temperature degrees C)
TA (ambient temperature)Ambient derating factor to compare to Table 310-16 - use upper limitAmperes from N-M CalculationThermal Derating Factor using N-M Equation brought up from belowThermal Derating Factor using R-Value for same insulation
Sheet1
Page 2
Recalculation with outside thermal insulation using N-M equationsRCA minus Re from aboveThermal thickness in inches (variable)Total insulation addon to outside diameter (2 x thickness) DI''Raceway O.D. from above DC''Thermal insulation thermal conductivity BTU - in / hr - ftsqd-degrees FThermal conductivity in Watts/cm-degrees (above x .00144131)Thermal Resistance (1/conductivity) in degrees-cm/WattRI'' thermal ohm feet for insulation
Calculation of Re''' for outside thermal insulationDs''' outside diameter of thermal barriere''' emissivity .3 for dull, .95 for foil covered)Re'''
RCA''' (RCA-Re+RI'''+Re''')
New ampacity with thermal insulation
Degrees FConversion from Degrees F to Degrees C
Degrees C Conversion of degrees C. to degrees F
Thermal Derating Factor using N-M equations
Calculation Below Using R-Value for one inch of insulation
RCA minus Re from aboveThermal thickness in inches (variable)Total insulation addon to outside diameter (2 x thickness) DI''Raceway O.D. from above DC''R value for one inch of insulation in BTUth-in / hr-ft*ft-F693.81 times R-Value to convert to degrees-cm/Watt)RI'' thermal ohm feet for insulation
Calculation of Re''' for outside thermal insulationDs''' outside diameter of thermal barriere''' emissivity .3 for dull, .95 for foil covered)Re'''
Sheet1
Page 3
RCA''' (RCA-Re+RI'''+Re''')
New ampacity with thermal insulation using R-ValueThermal Derating Factor with R-Value
Sheet1
Page 4
Sheet1
Page 5
3 - No. 2 copper concentric 3 - No. 2 copper concentric 3 - No. 3/0 THWN copper concentric stranded in 1 inch EMT stranded in 1 inch schedule 80 stranded in 11/2 inch EMT30 degree ambient ref. 30 degree ambient ref. 30 degree ambient ref.
0.045 0.045 0.050.292 0.292 0.470.382 0.382 0.57400 400 500
0.560066455023794 0.560066455023794 0.502661986420643
3 3 33.2 3.2 3.2
0.19 0.19 0.192.15 2.15 2.15
0.382 0.382 0.570.8213 0.8213 1.2255
9.49273212696529 9.49273212696529 6.78205581066761
71 0.16 710.057 0.179 0.065
1.40845070422535 625 1.408450704225351.163 1.315 1.74
0.00226472760614319 3.07262323943662 0.001705276434727771.163 1.315 1.740.95 0.95 0.95
3 3 37.72597249662226 7.05396655677329 5.67403561303475
17.7810358062175 20.179388378199 12.960458686557766360 66360 16780012.9 12.9 12.9
203.815580750613 203.815580750613 76.87723480333730.2 0.19 0.079
0.194 0.194 0.0761 1 1.04
203.815580750613 203.815580750613 79.9523241954708
90 90 75
30 30 30100.00% 100.00% 100.00%
128.670327564581 120.782199860387 208.39175124601680.93% 83.21% 66.12%80.74% 83.03% 67.16%
Sheet1
Page 6
10.0550633095952 13.1254218214257 7.286423073522981 1 12 2 2
1.163 1.315 1.740.32 0.32 0.17
0.0004612192 0.0004612192 0.00024502272168.16645967904 2168.16645967904 4081.2545123370211.3053266781767 10.447729320419 16.2755052777337
3.163 3.315 3.740.32 0.32 0.17
5.78646952875601 5.57302966513914 6.07981841608997
27.1468595165279 29.1461808069838 29.6417467673467
104.135099680709 100.500010580471 137.796699015916
212 212 160100 100 71.1111111111111
90 90 32194 194 89.6
80.93% 83.21% 66.12%
10.0550633095952 13.1254218214257 7.286423073522981 1 12 2 2
1.163 1.315 1.743.125 3.125 5.883
2168.15625 2168.15625 4081.6842311.3052734425239 10.4476801231064 16.2772189351571
3.163 3.315 3.740.3 0.3 0.3
5.91563556446891 5.69862663098193 5.16849286747984
Sheet1
Page 7
27.275972316588 29.271728575514 28.7321348761599
103.888341786153 100.284254438193 139.96091147710280.74% 83.03% 67.16%
Sheet1
Page 8
3 - No. 3/0 THWN copper concentric 3 - 500 kcmil XHHW copper concentric stranded in 11/2 inch SCH 80 PVC stranded in 3 inch EMT
30 degree ambient ref. 30 degree ambient ref.0.05 0.0650.47 0.8130.57 0.943500 500
0.502661986420643 0.386526882859561
3 33.2 3.2
0.19 0.192.15 2.150.57 0.943
1.2255 2.027456.78205581066761 4.32929716566326
0.16 710.2 0.072625 1.408450704225351.9 3.5
2.29411764705882 0.0009229707298634281.9 3.50.3 0.953 3
8.65393374426867 3.13462384513858
18.2327691884157 7.85137086439127167800 500000
12.9 12.976.8772348033373 27.0504038772213
0.077 0.0290.076 0.02581.002 1.13
77.030989272944 30.5669563812601
75 90
30 30100.00% 100.00%
178.99759757647 500.00780148993678.13% 76.11%78.13% 76.11%
Sheet1
Page 9
9.57883544414708 4.716747019252691 12 2
1.9 3.50.17 0.32
0.0002450227 0.00046121924081.25451233702 2168.1664596790415.2954484334882 5.10719358978902
3.9 5.50.3 0.3
4.99360468172341 3.7310990377692
29.8678885593587 13.5550396468109
139.852829711414 380.538963117359
160 16071.1111111111111 71.1111111111111
75 90167 194
78.13% 76.11%
9.57883544414708 4.716747019252691 12 2
1.9 3.55.883 3.125
4081.68423 2168.1562515.297058900156 5.10716954052512
3.9 5.50.3 0.3
4.99360468172341 3.7310990377692
Sheet1
Page 10
29.8694990260265 13.555015597547
139.849059454732 380.53930069269478.13% 76.11%
Sheet1
Page 11
3 - 500 kcmil XHHW copper concentric3 - No. 2 copper concentric stranded in 3 inch SCH 80 PVC stranded in 1 inch EMT
30 degree ambient ref. 30 degree ambient ref.0.065 0.0450.813 0.2920.943 0.382500 400
0.386526882859561 0.560066455023794
3 33.2 3.2
0.19 0.192.15 2.15
0.943 0.3822.02745 0.8213
4.32929716566326 9.49273212696529
0.16 710.3 0.057625 1.408450704225353.5 1.163
1.828125 0.002264727606143193.5 1.1630.3 0.953 3
5.45506747057135 7.72597249662226
11.9990165190942 17.7810358062175500000 66360
12.9 12.927.0504038772213 203.815580750613
0.027 0.20.0258 0.1941.018 1
27.5373111470113 203.815580750613
90 90
30 30100.00% 100.00%
426.129925076307 128.67032756458188.32% 80.93%88.32% 80.74%
Sheet1
Page 12
6.54394904852282 10.05506330959521 12 2
3.5 1.1630.32 0.32
0.0004612192 0.00046121922168.16645967904 2168.166459679045.10719358978902 11.3053266781767
5.5 3.1630.3 0.32
3.7310990377692 5.78646952875601
15.382241676081 27.1468595165279
376.361372908491 104.135099680709
160 21271.1111111111111 100
90 90194 194
88.32% 80.93%
6.54394904852282 10.05506330959521 12 2
3.5 1.1633.125 3.125
2168.15625 2168.156255.10716954052512 11.3052734425239
5.5 3.1630.3 0.3
3.7310990377692 5.91563556446891
Sheet1
Page 13
15.3822176268171 27.275972316588
376.361667118684 103.88834178615388.32% 80.74%
Sheet1
Page 14
Conductors in Raceway in Free AirLocked cells are in colorVariable cells are whiteInsulation Thickness from NEC Table 310-13Conductor Diameter from NEC Table 8 Chapt 9DI outside conductor DiameterInsulation Degrees C - cm / WattRI Conductor Insulation Thermal Ohm Feet
Number of ConductorsFactor A' from Table VII N-MFactor B' from Table VII N-MMultiplier for Ds from Table VII NotesDI (conductor diameter from above)Ds (multiplier x DI))RsdCalculation of Rd for duct wallThermal Conductivity in W / m-C (71 for iron, 130 for Al, and 0.16 for PVC)t thickness of duct wallDuct wall thermal resistance in C -cm / WattOutside Diameter of Duct or racewayRd thermal ohm feet calculationDs' (conduit O.D.) from manufacturee (emissivity)N (number of conductors)Re
RCA (Sum of Ri + Rsd +Rd+ Re)Circular mil area for calculating resistance using NMCircular mil ohms per foot at 75 degrees C. (enter 12.9 for copper and 21.2 for aluminum)RDC Calculated using NM for Temperature TC75 degree C. AC Resistance from NEC Chapter 9 Table 9 Cols 4-6 for Reference75 degree C. DC Resistance from Chapter 9 Table 8 for ReferenceAC/DC Ratio from Standard Handbook for Electrical EngineersAC Resistance corrected for temperature
TC (maximum insulation temperature degrees C)
TA (ambient temperature)Ambient derating factor to compare to Table 310-16 - use upper limitAmperes from N-M CalculationThermal Derating Factor using N-M Equation brought up from belowThermal Derating Factor using R-Value for same insulation
Sheet1
Page 15
Recalculation with outside thermal insulation using N-M equationsRCA minus Re from aboveThermal thickness in inches (variable)Total insulation addon to outside diameter (2 x thickness) DI''Raceway O.D. from above DC''Thermal insulation thermal conductivity BTU - in / hr - ftsqd-degrees F 0.32 for fiberglass, .17 for polyurethaneThermal conductivity in Watts/cm-degrees (above x .00144131)Thermal Resistance (1/conductivity) in degrees-cm/WattRI'' thermal ohm feet for insulation
Calculation of Re''' for outside thermal insulationDs''' outside diameter of thermal barriere''' emissivity .3 for dull, .95 for foil covered)Re'''
RCA''' (RCA-Re+RI'''+Re''')
New ampacity with thermal insulation
Degrees FConversion from Degrees F to Degrees C
Degrees C Conversion of degrees C. to degrees F
Thermal Derating Factor using N-M equations
Calculation Below Using R-Value for one inch of insulation
RCA minus Re from aboveThermal thickness in inches (variable)Total insulation addon to outside diameter (2 x thickness) DI''Raceway O.D. from above DC''R value for one inch of insulation in BTUth-in / hr-ft*ft-F693.81 times R-Value to convert to degrees-cm/Watt)RI'' thermal ohm feet for insulation
Calculation of Re''' for outside thermal insulationDs''' outside diameter of thermal barriere''' emissivity .3 for dull, .95 for foil covered)Re'''
Sheet1
Page 16
RCA''' (RCA-Re+RI'''+Re''')
New ampacity with thermal insulation using R-ValueThermal Derating Factor with R-Value
Sheet1
Page 17
Sheet1
Page 18
Thermal insulation thermal conductivity BTU - in / hr - ftsqd-degrees F 0.32 for fiberglass, .17 for polyurethane