www.AFLglobal.com or 800-890-8878 Bus Conductors 620 Bus Conductors Integral Web (IWBC) This shape is used for station bus, open or enclosed and for the high-current bus of outdoor substations for distribution voltages, as well as for 600-volt bus for industrial plants. AFL offers the integral web bus conductor in both ventilated and non-ventilated conditions. The use of this shape makes it unnecessary to use the spacer clamps or welded tie-bars normally needed across the channels between insulator supports. Although convection airflow is less than that of a face-to-face channel arrangement, transverse strength is greater. The shallow grooves extruded on the surface facilitate location of the centers of drilled or punched holes for attaching base plates and taps. Size Wall Thickness Area Weight Height A Width B T sq in lb/ft in in in 4 4 0.156 2.439 2.87 4 4 0.250 3.781 4.45 4 4 0.312 4.460 5.25 6 4 0.250 4.780 5.62 6 4 0.375 6.020 7.10 6 4 0.375 6.950 8.17 6 5 0.375 7.600 8.94 6 6 0.375 8.600 10.15 6 6 0.550 11.220 13.19 7 7 0.500 12.840 15.10 8 5 0.375 9.080 10.68 8 5 0.500 11.750 13.82 8 8 0.500 16.120 18.96 9 9 0.625 20.040 23.57 10 10 0.625 23.500 27.64 © 2011, AFL, all rights reserved. 02.15.11 Specifications are subject to change without notice. B A T www.AFLglobal.com or 800-890-8878 621 Bus Conductors Bus Conductors Size Wall Thickness Area sq in Weight lb/ft Moment of Inertia, in 4 DC Resistance Rdc-20 o C microhms per ft Current Rating DC 70 o C e=0.35 Indoors Inductive Reactance Xa-60Hz 1 ft spacing microhms per ft Rac/ RDC70 o C 60HZ AC 60 Hz Resistance Rac-70 o C microhms per ft Current Rating AC-60Hz A in B in T in l x-x l y-y Indoor e=0.35 Outdoor e= 0.50 4 4 0.156 2.439 2.87 3.876 6.213 6.88 2260 39.02 1.020 7.017 2240 2520 4 4 0.250 3.781 4.45 5.788 9.213 4.42 2810 39.76 1.035 4.579 2276 3115 4 4 0.312 4.460 5.25 6.892 10.94 3.75 3050 40.80 1.050 3.940 2980 3360 6 4 0.250 4.780 5.62 16.35 12.74 3.50 3480 34.80 1.050 3.670 3400 3780 6 4 0.375 6.020 7.10 14.50 14.00 2.78 3900 36.60 1.080 3.000 3760 4180 6 4 0.375 6.950 8.17 22.91 17.45 2.41 4200 ---- 1.090 2.630 4020 4470 6 5 0.375 7.600 8.94 25.19 29.78 2.20 4500 32.50 1.110 2.440 4320 4800 6 6 0.375 8.600 10.15 29.73 45.98 1.95 5020 27.60 1.110 2.160 4760 5270 6 6 0.550 11.22 13.19 40.05 60.86 1.49 5730 31.40 1.220 1.820 5190 5740 7 7 0.500 12.84 15.10 64.83 95.67 1.30 6530 27.60 1.210 1.570 5940 6540 8 5 0.375 9.080 10.68 52.88 37.59 1.84 5350 29.10 1.120 2.064 5060 5560 8 5 0.500 11.75 13.82 66.84 46.67 1.42 6090 30.00 1.280 1.820 5380 5910 8 8 0.500 16.12 18.96 103.5 152.3 1.04 7740 24.70 1.260 1.310 6890 7550 9 9 0.625 20.04 23.57 162.3 240.1 0.83 9060 21.60 1.370 1.140 7740 8450 10 10 0.625 23.50 27.64 255.6 362.4 0.71 10260 19.10 1.420 1.010 8610 9350 Physical & Electrical Properties of Integral-Web Channel Bus Conductors – 6101-T6 Alloy 55.0% IACS Conductivity (minimum) Notes: 1. Current ratings are based on 6101-T61 alloy with standard vent-holes in web. For 6101-T6 reduce the rating by 2 percent. Indoor ratings are based on 30 o C rise over 40 o C ambient in still but unconfined air, normally oxidized surface (e=0.35) and similarly for outdoor ratings, except 2 ft/sec cross wind (e=0.50). Horizontal mounting is assumed with spacing sufficient to eliminate proximity effects, generally assumed to be 18-in. or over. For temperature rise of 50 o C above 40 o C ambient, the indoor ratings for 30 o C may be increased about 30 percent. Indoor ratings (D-C and A-C) calculated by computer and verified by test rounded. Outdoor ratings are calculations only. 2. For vent and notch arrangements, consult your AFL Sales Representative. The interior perimeter varies according to the washer diameters that are to be accommodated, and as to their location per NEMA spacing. The 12 in. x 12 in. size is a opposite of two symmetric extrusions bolted together. Size of IWBC Size Code 4” x 4” I44 6” x 4” I64 6” x 5” I65 6” x 6” I66 7” x 7” I77 8” x 5” I85 8” x 8” I88 9” x 9” I99 10” x 10” I101 Step 1: Choose Size of IWBC Step 2: Choose Wall Thickness Wall Thickness Thickness Code 5/32 156W 1/4 250W 5/16 312W 3/8 375W 0.550 550W 1/2 500W Step 3: Standard Alloy Alloy Number Alloy Code 6101 Z Step 5: Choose Piece Length Piece Length is a whole number between 10 feet and 40 feet. Step 4: Choose Temper Ordering Instructions: Temper Temper Code T6 T6 T61 T61 T63 T63 Step 6: Build Catalog Number Size Code + Thickness Code + Alloy Code + Temper + Vented Example: To order 8” x 8” IWBC with 1/2” wall thickness 6101 T-6 Alloy I88 + 500W + Z + T6 + V Completed Catalog Number is I88500WZT6V. Example: To order 4” x 4” IWBC with 1/4” wall thickness 6063 T-6 Alloy Non-vented I44 + 250W + Y + T6 + Completed Catalog Number is I44250WYT6 © 2011, AFL, all rights reserved. 02.15.11 Specifications are subject to change without notice.