grounding multiple services

Status
Not open for further replies.
R

rippledipple

Member
Location
New Jersey
Occupation
Electrical contractor
hello gentlemen, i'm wiring 4 separate 150a services side by side with 4 separate feeder laterals underground. Can i
use 1 set of ground rods. Thx,
 
Yes, just need to ‘tap’ off the GEC to each service disconnect.

Just remember the main GEC is sized off of the main service coductors. Notsure if you have 1 set of service conductors or 4 separate.193A5532-FECA-4855-BE50-6086A305CB67.jpeg
 
Or have a single common grounding electrode conductor go from your rods back to a busbar, and from there tap off to your separate disconnects. Might result in less wire, maybe not.
 
You can run one #6 from each panel to a single #6 to one rod and a #6 (or the same wire) to the second rod.

The text in blue is the only segment that must be unbroken or irreversibly spliced. This sizing is for rods, etc.
 
electrofelon said:
What on earth is a "service feeder"? 😳
Click to expand...
he did call it feeder lateral. Guess it sort of depends on exactly what he has but "lateral" is probably at least part of the correct term.

It could be four sets of conductors from same source to four disconnecting means, in which case that is still considered "one service" by NEC, not sure if that would be four laterals or just one lateral though. Is definitely just one if they are joined at both ends to create a parallel set.

Or it could be four service laterals from four different sources, in that case it is actually four services.

Grounding electrode system has basically the same options of how to do it for either situation though.
 
Let's get terms straight please. Are these service conductors or feeders. If you guys are not on the 2020 then you cannot run 4 feeders to a building unless you meet the terms of 225.30-- this is from the 2017 which I believe NJ is under

225.30 Number of Supplies. A building or other structure
that is served by a branch circuit or feeder on the load side of a
service disconnecting means shall be supplied by only one
feeder or branch circuit unless permitted in 225.30(A)
through (E). For the purpose of this section, a multiwire
branch circuit shall be considered a single circuit.
Where a branch circuit or feeder originates in these additional
buildings or other structures, only one feeder or branch
circuit shall be permitted to supply power back to the original
building or structure, unless permitted in 225.30(A)
through (E).
(A) Special Conditions. Additional feeders or branch circuits
shall be permitted to supply the following:
(1) Fire pumps
(2) Emergency systems
(3) Legally required standby systems
(4) Optional standby systems
(5) Parallel power production systems
(6) Systems designed for connection to multiple sources of
supply for the purpose of enhanced reliability
(7) Electric vehicle charging systems listed, labeled, and identified
for more than a single branch circuit or feeder
(B) Special Occupancies. By special permission, additional
feeders or branch circuits shall be permitted for either of the
following:
(1) Multiple-occupancy buildings where there is no space
available for supply equipment accessible to all occupants
(2) A single building or other structure sufficiently large to
make two or more supplies necessary
(C) Capacity Requirements. Additional feeders or branch
circuits shall be permitted where the capacity requirements are
in excess of 2000 amperes at a supply voltage of 1000 volts or
less.
(D) Different Characteristics. Additional feeders or branch
circuits shall be permitted for different voltages, frequencies,
or phases, or for different uses such as control of outside lighting
from multiple locations.
(E) Documented Switching Procedures. Additional feeders or
branch circuits shall be permitted to supply installations under
single management where documented safe switching procedures
are established and maintained for disconnection.
Click to expand...
 
Status
Not open for further replies.
Top