We have a process plant with various pin/sleeve configurations in wet locations. The 120/208V type can be protected by GFCI breakers as required by code. But the 277/480V do not have code requirement. This doesn't seem right but maybe the breaker settings are more sensitive at higher voltage. We have an RFI in to verify what the customer will require, but I'm not finding the breakers we need in Eaton's or Seimens's catalog. There is GFCI equipment that we can add but it will require added costs to the customer.