After selective coordination is installed, can an Electrical Worker inadvertently adjust a circuit breaker setting in a way that undermines coordination?

After selective coordination is installed, can an Electrical Worker inadvertently adjust a circuit breaker setting in a way that undermines coordination?

• A. True
• B. False
• C. Not applicable
• D. Sometimes

Answer: (B)

The key idea is that selective coordination is put in place to ensure each protective device trips in the correct order, so only the device closest to the fault clears it. Once this coordination is installed, breakers and settings are typically documented, locked, or otherwise controlled through change-management processes. That means an Electrical Worker would need to follow proper procedures, obtain authorization, and perform testing to adjust any setting. With those safeguards, accidental changes that undermine coordination are not expected to happen in normal work. So the statement is false: you don’t normally undermine coordination inadvertently because changes are restricted and require deliberate action. If a change did occur outside those controls, it would indicate noncompliance rather than a typical, inadvertent risk.

The key idea is that selective coordination is put in place to ensure each protective device trips in the correct order, so only the device closest to the fault clears it. Once this coordination is installed, breakers and settings are typically documented, locked, or otherwise controlled through change-management processes. That means an Electrical Worker would need to follow proper procedures, obtain authorization, and perform testing to adjust any setting. With those safeguards, accidental changes that undermine coordination are not expected to happen in normal work.

So the statement is false: you don’t normally undermine coordination inadvertently because changes are restricted and require deliberate action. If a change did occur outside those controls, it would indicate noncompliance rather than a typical, inadvertent risk.