Lightning Arrestors [RE-wrenches]

[Drake Chamberlin - Electrical Energy]

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Hi Todd,

The issue of bonding the neutral at separate structures is somewhat of a 
confusing issue.  With the '99 code, grounding can still be accomplished 
either with equipment grounding conductors that are not connected to the 
neutral, or with no equipment grounding conductors and a normal ground rod 
connection to the neutral.

If the disconnecting means is in a building separate from the loads, the 
bonding connection is not made.  If the disconnect is in the same building 
as the loads, fed from a service in a remote building, then the neutral 
must be bonded so long as there is no equipment bonding connection.

The 96 Code required a neutral connection to a ground rod in situations 
where more than one branch circuit was run, and equipment was present that 
require grounding.

96 Code

  250-24. Two or More Buildings or Structures Supplied from a Common Service.
   (a) Grounded Systems. Where two or more buildings or structures are 
supplied from a common ac service, the grounded system in each building or 
structure shall have a grounding electrode as described in Part H connected 
to the metal enclosure of the building or structure disconnecting means and 
to the ac system grounded circuit conductor on the supply side of the 
building or structure disconnecting means.

Where equipment grounding conductors are not run, the 99 Code still 
requires the neutral (or grounded circuit conductor) to be bonded.  The 99 
Code still allows one circuit to go to another building without installing 
a grounding electrode.

'99 Code
250-32. Two or More Buildings or Structures Supplied from a Common Service
b)
2) Grounded Conductor. Where (1) an equipment grounding conductor is not 
run with the supply to the building or structure, and (2) there are no 
continuous metallic paths bonded to the grounding system in both buildings 
or structures involved, and (3) ground-fault protection of equipment has 
not been installed on the common ac service, the grounded circuit conductor 
run with the supply to the building or structure shall be connected to the 
building or structure disconnecting means and to the grounding electrode(s) 
and shall be used for grounding or bonding of equipment, structures, or 
frames required to be grounded or bonded.

The rearrangement of the '99 Code makes it hard to follow, but it still 
seems the same.

Drake


At 01:37 PM 08/12/2001 -0700, you wrote:
>If these separate buildings have distribution sub panels, fed from a main 
>panel on another building, the only place where neutral and ground are 
>bonded is at that main service entrance panel. Separate buildings do not 
>bond neutral and ground but DO have individual water bond and ground rod 
>connections to their sub panel's ground bus not neutral.
>
>Todd
>
>Drake Chamberlin - Electrical Energy wrote:
>>In this situation, the rods do not need to be bonded together in this
>>way.   The locations are separate.  In the wiring for buildings, a ground
>>rod is bonded to the neutral at the disconnect for the separate
>>structure.  A separate conductor connecting the rods would create a
>>parallel neutral path.
>>
>>Drake
>
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