General Order 95
Section X
Supply and Communication Lines in Line Crossings or Conflicts
104
Insulators for Supply Conductors
Where grounded pins and insulators with grounded bases are used
at crossings with ungrounded construction being used at other parts of the
line, the insulators used on such grounded supports shall have a rating
of 25% greater than the flashover voltage values of the line insulators
used on ungrounded pins, except where these values exceed those specified
in Table 12
, 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.