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General Order 64-A


Section XI


Supply Lines And Communication Lines Crossings Over Railways


114.1    Additional Insulation.

Where grounded pins are used at crossings (non-grounded construction being used at other parts of the line), the insulators used on such metal or grounded supports shall have a ratings of 25% greater than the flash-over voltage values of the line insulators except where these values exceed those specified in Table 9, Rule 55.3, by 50%.  As an alternative, the conductors at their points of attachment, where suspension insulators are used, may be protected by arcing shields.