Selective coordination is required for multiple elevators supplied by the same source.

Selective coordination is required for multiple elevators supplied by the same source.

• A. True
• B. False
• C. Not specified
• D. Only in certain buildings

Answer: (A)

Selective coordination means protective devices are arranged so the device closest to a fault operates, isolating only the affected portion of the system. When several elevators are fed from the same source, you want a fault in one elevator’s circuit to be cleared by its local protection, not by upstream devices that feed the entire bank. This keeps the other elevators powered and available for use, supports safe egress, reduces downtime, and prevents a single fault from causing a widespread outage. In practice, this approach is standard for critical systems and is commonly required by electrical codes and design guidelines for elevator installations fed from a common source. While there can be exceptions based on specific designs, the general rule is to implement selective coordination in such setups.

Selective coordination means protective devices are arranged so the device closest to a fault operates, isolating only the affected portion of the system. When several elevators are fed from the same source, you want a fault in one elevator’s circuit to be cleared by its local protection, not by upstream devices that feed the entire bank. This keeps the other elevators powered and available for use, supports safe egress, reduces downtime, and prevents a single fault from causing a widespread outage. In practice, this approach is standard for critical systems and is commonly required by electrical codes and design guidelines for elevator installations fed from a common source. While there can be exceptions based on specific designs, the general rule is to implement selective coordination in such setups.