Application Engineering FAQ
Self-Certification of Power Distribution Blocks
1000Vdc for Finger-Safe PDBFS Series
Cooper Bussmann performed a dielectric voltage-withstand test on the PDBFS Series of power
distribution blocks. These dielectric tests were conducted per UL 1059 Part II. The part numbers
tested were:
PDBFS204
PDBFS220
PDBFS303
PDBFS330
PDBFS377
PDBFS500
PDBFS504
Dielectric tests are performed at two-times (2x) rated voltage plus 1000 volts for products rated
600 volts and below. This, however, is not the applicable requirement for products rated over 600
volts that requires dielectric voltage-withstand tests be performed at:
[2000 + 2.25(1000)] = 4250Vac
Test Procedure:
1. 4250Vac was applied across both poles for a period of 15 minutes, as opposed to the 1
minute required UL 1059. The sample was monitored for leakage current.
2. 4250Vac was applied between a pole and ground for a period of 15 minutes, as
opposed to the 1 minute required in UL 1059. The sample was monitored for
leakage current.
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Application Engineering FAQ
Self-Certification of Power Distribution Blocks
1000Vdc for Finger-Safe PDBFS Series (Cont)
Test Results:
The test results show that the PDBFS Series passed a 1000Vdc dielectric voltage-withstand test.
There were no signs of leakage current during the tests.
This letter self-certifies that the Cooper Bussmann power distribution blocks listed above can be
used up to 1000Vdc.
Please note that our existing product is UL Listed at 600V and this self-certification testing did not
involve UL. Therefore, the product marking will remain at 600V.
If you have any questions about this information or about overcurrent protection in general, please
contact us at:
Phone: 636-527-1270
Fax: 636-527-1607
Email: fusetech@cooperindustries.com
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