The transfer equipment’s exterior marking must reflect the SCCR level chosen for the installation, regardless of whether the OCPD is integral or line side.

The transfer equipment’s exterior marking must reflect the SCCR level chosen for the installation, regardless of whether the OCPD is integral or line side.

• A. True
• B. False
• C. Only for certain installations
• D. Not specified

Answer: (A)

Markers on transfer equipment convey the fault-current level the equipment is designed to withstand and interrupt. That rating must match the SCCR level chosen for the installation, and it should be displayed on the exterior regardless of whether the protecting device is built-in or located on the line side. This alignment ensures workers can quickly verify that the equipment is suitable for the system’s available short-circuit current and that protection coordination is maintained. If the marking didn’t reflect the installation’s SCCR, there could be a dangerous mismatch between the system’s fault current and what the equipment can safely handle, risking arcing, overheating, or failure to interrupt during a fault.

Markers on transfer equipment convey the fault-current level the equipment is designed to withstand and interrupt. That rating must match the SCCR level chosen for the installation, and it should be displayed on the exterior regardless of whether the protecting device is built-in or located on the line side. This alignment ensures workers can quickly verify that the equipment is suitable for the system’s available short-circuit current and that protection coordination is maintained. If the marking didn’t reflect the installation’s SCCR, there could be a dangerous mismatch between the system’s fault current and what the equipment can safely handle, risking arcing, overheating, or failure to interrupt during a fault.