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Thuyết minh: LÝ THUYẾT THIẾT KẾ TUYẾN
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Hệ thống phải được thiết kế để cho phép có thể nới rộng thêm trong tương lai. Tuy nhiên, ở các nước đang phát triển (như ở thực trạng nước ta) thường khó dự đoán chính xác dung lượng cần thiết trong khoảng thời gian dài. Do đó không nên lắp đặc các hệ thống có dung lượng quá lớn cho các yêu cầu cho tương lai. Sẽ kinh tế hơn khi chọn các thiết bị có dung lượng nhỏ ở giai đoạn đầu tiên và nếu dung lượng này không đáp ứng được sau khi sử dụng vài năm, hệ thống có thể thay. | ,0.030,0.035,0.040,0.045,0.050,0.055,0.060,0.065,0.070,0.075,0.080,0.085,0.090,0.095,0.100,0.105,0.110,0.115,0.120,0.125,0.130,0.135,0.140,0.145,0.150,0.155,0.160,0.165,0.170,0.175,0.180,0.185,0.190,0.195,0.200,0.205,0.210,0.215,0.220,0.225,0.230,0.235,0.240,0.245,0.250,0.255,0.260,0.265,0.270,0.275,0.280,0.285,0.290,0.295,0.300,0.305,0.310,0.315,0.320,0.325,0.330,0.335,0.340,0.345,0.350,0.355,0.360,0.365,0.370,0.375,0.380,0.385,0.390,0.395,0.400,0.405,0.410,0.415,0.420,0.425,0.430,0.435,0.440,0.445,0.450,0.455,0.460,0.465,0.470,0.475,0.480,0.485,0.490,0.495,0.500,0.505,0.510,0.515,0.520,0.525,0.530,0.535,0.540,0.545,0.550,0.555,0.560,0.565,0.570,0.575,0.580,0.585,0.590,0.595,0.600,0.605,0.610,0.615,0.620,0.625,0.630,0.635,0.640,0.645,0.650,0.655,0.660,0.665,0.670,0.675,0.680,0.685,0.690,0.695,0.700,0.705,0.710,0.715,0.720,0.725,0.730,0.735,0.740,0.745,0.750,0.755,0.760,0.765,0.770,0.775,0.780,0.785,0.790,0.795,0.800,0.805,0.810,0.815,0.820,0.825,0.830,0.835,0.840,0.845,0.850,0.855,0.860,0.865,0.870,0.875,0.880,0.885,0.890,0.895,0.900,0.905,0.910,0.915,0.920,0.925,0.930,0.935,0.940,0.945,0.950,0.955,0.960,0.965,0.970,0.975,0.980,0.985,0.990,0.995,1.000,1.050,1.100,1.150,1.200,1.250,1.300,1.350,1.400,1.450,1.500,1.550,1.600,1.650,1.700,1.750,1.800,1.850,1.900,1.950,2.000,2.050,2.100,2.150,2.200,2.250,2.300,2.350,2.400,2.450,2.500,2.550,2.600,2.650,2.700,2.750,2.800,2.850,2.900,2.950,3.000,3.050,3.100,3.150,3.200,3.250,3.300,3.350,3.400,3.450,3.500,3.550,3.600,3.650,3.700,3.750,3.800,3.850,3.900,3.950,};