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4. Allow the termination to air-dry in the

upright position before applying the

voltage.

This method, when tested on various

surfaces including silicone rubber and glazed

porcelain, has repeatedly produced a coating

thickness of from 0.2 to 0.5 grams per

square inch of surface.

The terminations are then tested in a

contamination building. All terminations are

mounted vertically. The uniform fog rate

called out in ASTM-D-232 is obtained by

the use of special atomizing, wide-angle

nozzles.

An on/off cycle is controlled to give a fog

rate of 7 to 9 milligrams per square inch per

minute.

Each sample is energized at 8.7 kV. The

system is set up such that approximately

500 milliamps trip the circuit breaker. All

samples are recontaminated every seven

days. The new contaminant is applied over

whatever contaminant remains.

The sample is considered to have failed

when:

. 500 milliamps over the surface

continuously cause the circuit break to

trip.

2. Cable failure occurs.

3. The surface of the termination is

severely burned.

The time in hours for each failure is

recorded the results are as follows:

Tape Termination

Protection

Time to

Failure

No protection

Electrical Tape 70 HDT

self-fusing

15 hrs.

100 hrs. MIN