scope:

1.1 This specification covers an ozone-resisting crosslinked rubber insulating compound for electrical wires and cables. The polymer consists substantially of butyl rubber.

1.2 This type of insulation is considered suitable for use at not more than 15000 V between phases at an insulation level of 133 % or 28000 V between phases at an insulation level of 100 %. The conductor temperature shall not exceed 85-C for an operating voltage of 15000 V or less, and shall not exceed 80-C for an operating voltage above 15000 V.

1.3 Whenever two sets of values are presented, in different units, the values in the first set are the standard, while those in parentheses are for information only.

1.4 In many instances the insulation material cannot be tested unless it has been formed around a conductor or cable. Therefore, tests are done on insulated wire or cable in this document solely to determine the relevant property of the insulation material and not to test the insulated conductor or completed cable.