kirkdb
New User
- Location
- Cimarron, CO
- Occupation
- Computer Science / Engineering
We are installing two RV pedestals at our property in Cimarron, Co. Colorado adopted 2020 NEC for what its worth. Our RV pedestals are 50/30/20 unmetered direct burial type. From our meter to the first RV pad we are looking at 194ft. We will loop feed (daisy chain in my world) to the second RV pad which is 54 feet away.
The RV pedestals support up to 350kcmil on the post line connectors and 4/0 for the ground lugs. The pedestals are rated for 100amp but a normal use would be 50amp per pedestal. Aka we will not plug more than one RV in at a time and if we ever did we would expect the breaker at the meter to protect the wiring.
I've calculated 250kcmil to the first pedestal and Looking at something along the line of triplex AL 250-250-3/0 with a #2 AL ground back to the meter. My inspector indicated that I do NOT need ground rods at the pedestal as long as the meter is properly grounded. I'm actually surprised by that statement as some of my neighbors indicated otherwise.
Even if I use NEC demand factor of 90% for 2 RV pedestals I'm still looking at 90a at the first pedestal and 45a at the second. Other folks have told me I could use 2/0 AL however I'm having trouble seeing the math. 2/0 would definitely fit most 100a breakers at the meter, would cost less and would require smaller conduit. Looking for some feedback on properly calculating wire sizes.
Thanks,
Kirk
The RV pedestals support up to 350kcmil on the post line connectors and 4/0 for the ground lugs. The pedestals are rated for 100amp but a normal use would be 50amp per pedestal. Aka we will not plug more than one RV in at a time and if we ever did we would expect the breaker at the meter to protect the wiring.
I've calculated 250kcmil to the first pedestal and Looking at something along the line of triplex AL 250-250-3/0 with a #2 AL ground back to the meter. My inspector indicated that I do NOT need ground rods at the pedestal as long as the meter is properly grounded. I'm actually surprised by that statement as some of my neighbors indicated otherwise.
Even if I use NEC demand factor of 90% for 2 RV pedestals I'm still looking at 90a at the first pedestal and 45a at the second. Other folks have told me I could use 2/0 AL however I'm having trouble seeing the math. 2/0 would definitely fit most 100a breakers at the meter, would cost less and would require smaller conduit. Looking for some feedback on properly calculating wire sizes.
Thanks,
Kirk
