S&C Instruction Sheet 665-506 15
Dielectric Testing
For the convenience of users who normally perform elec trical tests on system components
such as pad-mounted gear, appropriate withstand test values are given in the table
below:
RATINGS AND INSULATION TEST VALUES
Voltage Rating, kV Test Voltage Withstand, kV
Nom
Max
1 60-Hertz, RMS2 Dc34
Impulse (BIL)
14.4
25
25
17.0
27
f
29l
36
60
60
50
70
70
95
125
125
1 Maximum voltage ratings are lower than the values listed when cur rent-limiting fuses are used. Consult the
appropriate current-limiting fuse manufacturer for complete fuse ratings.
2 Ac withstand tests made on this equipment after shipment by S&C should be conducted at no more than
0.75 times the values shown. When making ac tests, the time duration for application of the test voltage should
be limited to less than 10 seconds.
3 The column headed “Dc” is given as a reference only for those making dc tests and represents values
believed to be appropriate and approxi mately equivalent to the corresponding power-frequency withstand
test values specified for components of this voltage class. The presence of this column in no way implies any
requirement for a dc withstand test on these components.
4 Dc withstand tests made on this equipment after shipment by S&C should be conducted at no more than
0.75 times the values shown. When making dc tests, the test voltage should be raised in discrete steps—one
minute per step.
f With S&C SME-20 or SME-4Z Power Fuses.
l With Fault Fiter Electronic Power Fuses or without fuses.
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