Required

Commercial Power "A"

No commercial power from source "A"

Close Tie and feed from Comm Power "B"

Investigate security & reliability of system supplying Comm Power "A"

Main Breaker Swgr "A"

No commercial power from source "A"

Close Tie and feed from Comm Power"B"

Conduct regular inspections & preventive maintenance & keep spare on-site

Buss Swgr "A"

No commercial power to critical loads or non-critical loads on Swgr "A"

ATS transfers critical loads to Emergency Generator Repair or replace buss

Conduct regular inspections & preventive maintenance Prevent animal & water damage

Commercial Power "B"

No commercial power from source "B"

Critical loads fed by preferred comm power source "A"

Investigate security & reliability of system supplying Comm Power "B"

Main Breaker Swgr "B"

No commercial power from source "B"

Critical loads fed by preferred comm power source "A"

Conduct regular inspections & preventive maintenance & keep spare on-site

Buss Swgr "B"

No commercial power from source "B" to crit loads & No power to non-crit loads "B"

Critical loads fed by preferred comm power source "A" Repair or replace Buss

Conduct regular inspections & preventive maintenance Prevent animal & water damage

Tie Between Swgr "A" and Swgr "B"

Reduced reliability Additional failures could lead to forced outage

Repair or replace tie switch

Conduct regular inspections & preventive maintenance

Critical Load Breaker Swgr "A"

No commercial power to critical loads

ATS transfers critical loads to Emergency Generator

Conduct regular inspections & preventive maintenance & keep spare on-site

Automatic Transfer Switch

Forced outage - No power to critical loads

Repair or replace ATS

Conduct regular inspections & preventive maintenance & test ATS monthly

Main Breaker Critical Load Swgr

Forced outage - No power to critical loads

Repair or replace breaker

Conduct regular inspections & preventive maintenance & keep spare on site

Buss Critical Load Swgr

Forced outage - No power to critical loads

Repair or replace buss

Conduct regular inspections & preventive maintenance Prevent animal & water damage

Emergency Generator

Reduced reliability - No on-site back-up to commercial power

Critical loads fed by preferred comm power source "A" - Repair gen.

Conduct regular inspections & preventive maintenance & test generator monthly

Breaker Emergency Generator

Reduced reliability - No on-site back-up to commercial power

Critical loads fed by preferred comm power source "A" Repair or replace breaker

Conduct regular inspections & preventive maintenance & keep spare on-site

Control System Emergency Generator

Reduced reliability - No on-site back-up to commercial power

Critical loads fed by preferred comm power source "A" - repair controls

Conduct regular inspections & preventive maintenance & test monthly

Figure 23.8 Failure Mode Effect and Criticality Analysis (FMECA) for example.
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