Minimum Electrical Clearance
Minimum Electrical Clearance As Per BS:162. INDOOR Voltage in KV Phase to earth in mm Phase to phase in mm 0.415 15.8 19.05 0.600 19.05 19.05 3.3 50.8 50.8 6.6 63.5 88.9 11 76.2 127.0 15 101.6 165.1 22 139.7 241.3 33 222.25 355.6 Minimum Electrical Clearance As Per BS:162. OUTDOOR Voltage in KV Phase to earth in mm Phase to phase in mm 6.6 139.7 177.8 11 177.8 228.6 22 279.4 330.2 33 381 431.8 66 685.8 787.4 110 863.6 990.6 132 1066.8 1219.2 220 1778 2057.4 Minimum Working Clearance: OUTDOOR SWITCHYARD Voltage in KV To ground in mm Between section(mm) 11 2750 2500 33 3700 2800 66 4000 3000 132 4600 3500 220 5500 4500 Minimum Ground Clearance As Per IE-1956(Rule 77) Voltage in KV To ground in mtr 132 6.10 220 7.00 400 8.84 800 12.40 Minimum Clearance between Lines Crossing Each Other (IE-1957) System Voltage 132KV 220KV 400KV 800KV Low & Medium 3.05 4.58 5.49 7.94 11-66KV 3.05 4.58 5.49 7.94 132KV 3.05 4.58 5.49 7.94 220KV 4.58 4.58 5.49 7.94 400KV 5.49 5....