PE & RCDD Holders?

Any PE’s in here have an RCDD? I am an electrical PE and I am thinking about pursuing the RCDD.

I do a good amount of Low Voltage work so it’s right up my alley. I am curious about the potential upside to salary and what raise I could expect?

Or, what is the going rate if I had both the PE and RCDD and was looking for a new job?