Can swap out of devices be done without a full site shutdown?

This article addresses swapping out Wattwatchers devices without having the site to be fully shutdown

Yes, if the A6M device(s) can be safely isolated and removed; and only if CT shorting links are installed that the CTs before can be safely isolated before removing the Auditor device.

Whenever possible, it is recommended to safely isolate the entire installation including the circuits being monitored before performing any work on an Auditor device.

CT disconnection links are recommended for commercial and industrial installations where isolating the power for maintenance may not be feasible in some situations.