COMMENT 1000V_T490.24

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I'm looking for constructive criticism on the following, and if you think it is merited, support in the form of comments from you on 1000V_T490.24. Thanks, Jim Williams

4 Comment:

Table 490.24 Minimum Clearance of Live Parts
Nominal
Voltage
Rating
(kV)
Impulse Withstand,
Basic Impulse Level
B.I.L (kV)
Minimum Clearance of Live Parts
Phase-to-Phase Phase-to-Ground
Indoors Outdoors Indoors Outdoors
Indoors Outdoors mm in. mm in. mm in. mm in.
1.0?2.3 TBS TBS TBS TBS TBS TBS TBS TBS TBS
2.4?4.16 60 95 115 4.5 180 7 80 3.0 155 6
7.2 75 95 140 5.5 180 7 105 4.0 155 6
13.8 95 110 195 7.5 305 12 130 5.0 180 7
14.4 110 110 230 9.0 305 12 170 6.5 180 7
23 125 150 270 10.5 385 15 190 7.5 255 10
34.5 150 150 320 12.5 385 15 245 9.5 255 10
200 200 460 18.0 460 18 335 13.0 335 13
46 ? 200 ? ? 460 18 ? ? 335 13
? 250 ? ? 535 21 ? ? 435 17
69 ? 250 ? ? 535 21 ? ? 435 17
? 350 ? ? 790 31 ? ? 635 25
115 ? 550 ? ? 1350 53 ? ? 1070 42
138 ? 550 ? ? 1350 53 ? ? 1070 42
? 650 ? ? 1605 63 ? ? 1270 50
161 ? 650 ? ? 1605 63 ? ? 1270 50
? 750 ? ? 1830 72 ? ? 1475 58
230 ? 750 ? ? 1830 72 ? ? 1475 58
? 900 ? ? 2265 89 ? ? 1805 71
? 1050 ? ? 2670 105 ? ? 2110 83
Note: The values given are the minimum clearance for rigid parts and bare conductors under favorable service conditions. They shall be increased
for conductor movement or under unfavorable service conditions or wherever space limitations permit. The selection of the associated impulse
withstand voltage for a particular system voltage is determined by the characteristics of the surge protective equipment.

5 Statement of Problem and Substantiation.

And row to table to cover full range of voltages covered in article, fill in proper values.