Results

ETL 1110-2-560

30 Jun 01

where

λ′ = adjusted failure rate - failures/year

t′ = adjusted time variable (operation time) - years

E-4. Results

The results for the electrical subsystems are shown in spreadsheet format in Tables E-3 through E-7. It is

evident that the lock electrical distribution reliability is much less than that of any other electrical subsys-

tem evaluated. This was attributed to the 100 percent demand on the major components of that subsystem

and also its greater failure rate.

Table E-1

Failure Rate Data of Electrical Components from ANSI/IEEE (1980)

Failure Rate

6

Component (Failures per Unit-Year)

per 10 Experience Hours

Electric Utility Power Supplies, Single Circuit (0.537)

61.3014

Liquid Filled, All (0.0041)

0.4680

Dry-Type (0.0036)

0.4110

Generator (Diesel or Gas Driven)

7.6500

E-6