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CALIBRATION AND CONDITION TESTS OF MOLDED CASE CIRCUIT BREAKERS - Federal Pacific Stab Lok Breakers - CPSC Data
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• Federal Pacific Electric FPE Panel/Breaker Failure Rates

FPE Stab-Lok Calibration Test Report - Failure Rate Summary

CPSC-C-81-1429 December 30, 1982
Final Report: Contract CPSC-C-81-1429
Date: December 30, 1982
Submitted by: Jesse Aronstein (original contains signature)
WRIGHTVM MALTA CORPORATION. Malta test station, Ballston Spa, New York 12020 518-899-2227

1.0 SUMMARY

Calibration tests have been performed on 122 two-pole Federal Pacific Electric circuit breakers. The calibration tests were performed -in accordance with UL Standard 489 except for or a difference in the sequence of calibrations. UL 489 is the applicable standard that the breakers are presumed to meet. In most cases, the calibration tests were repeated after 500 off-on mechanical operations of the toggle handle..

The circuit breakers tested were supplied by CPSC and came from several sources. Most were provided to CPSC by Federal Pacific Electric, some were purchased new by CPSC staff members at retail outlets, and a few were removed from existing installations. The breaker ratings tested were 30 A (30 two-pole breakers tested), 40A (35), 50A(20), 60A(7) and 80A (30). The tests include performance at 100%, 135%, and 200% of ratings, and dielectric tests.

A substantial number of breakers failed the calibrations testing, both before and after the mechanical toggle operations. Failures were evident with both poles carrying current as well as with one-pole operation. Specifically, the failures are summarized as follows:

The failures appeared. among breakers of all ratings, none were failure-free. Most of the "no-trip' conditions were sustained for four hours well beyond the UL specification. These were not marginal failures with respect to the failure criteria. The data suggests that, on the average, the mechanical operations result in increased failures. This was .'not strictly the case on a sample-to-sample basis.

 The failures relate to hazardous conditions in at least two ways. First, a fault in the wiring or utilization equipment which causes excessive- current-can result in fire if the circuit is not opened by the breaker -- this is its principal functional requirement. Secondly, it was determined in these tests that some of the breakers overheat to hazardous levels when subjected to overcurrent conditions (due to their own failure to trip) for sustained periods of time. The overheating can result in incapacitation of the breaker (i.e.: it will no longer open under any condition), and the temperature can be high enough to ignite fire in the vicinity of the breaker, as evidenced by charring of the case on some samples.

More Information about FPE Federal Pacific Stab Lok Panels and Circuit Breakers - Reference List

• The Federal Pacific Stab-Lok Electric Panel Hazard Website Safety Information for Consumers. 1983
• Home Inspection Reporting Language and discussion for FPE panels
• Schneider Canada Federal Pioneer circuit breaker recall
• Federal Pacific Electric Panels: Fires Waiting to Happen, Debate Waiting to Be Ended
• How to Identify Federal Pacific Electric Panels Stab Lok Breakers & History of the Federal Pacific Electric Stab Lok Hazard
• 1983 CPSC Investigation of FPE Circuit Breakers Safety Information for Consumers
• 1982 Reliance Electric Co. SEC Quarterly Report: Note C. reports litigation between Reliance and UV Liquidating Trust and contends that "... improper and deceptive practices were employed for many years to secure UL listings for Federal Pacific's circuit protective products..."
• 1980 Reliance Electric Co. Press Release: improper practices used to obtain UL Listing for most of FPE's circuit breakers and notes testing which indicates "possible defects." 1980, Reliance Electric Co.
• 1980 FPE - Exxon Buys A Scandal Along With A Company improper practices used to obtain UL Listing for most of FPE's circuit breakers and notes testing which indicates "possible defects." 1980, Reliance Electric Co.
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