Grounded wire
- Thread starter domnic
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kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
In general no. They bond primary and secondary grounded conductors together whenever they coexist at same structure.
Ungrounded secondary systems are probably rarely found when it comes to utility fed service. Most users of ungrounded systems are separately deriving them AFAIK within their own facility.
Ungrounded secondary systems are probably rarely found when it comes to utility fed service. Most users of ungrounded systems are separately deriving them AFAIK within their own facility.
- Location
- Massachusetts
Different power companies do it different ways.
In my area it is not uncommon for one grounded conductor to be used for both the primary and secondary side.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
If one conductor of both systems is bonded together then running a single conductor serves both systems. The conductor will not care which system it is connected to, it carries current from both systems, and you could connect it to hundreds of systems - which we do on POCO distribution systems. Every transformer is a separately derived system and every one of them bonds to the MGN of the primary system - ungrounded systems would be the exception if there even is any supplied by any POCO's, those are usually derived by customer transformers and not the POCO.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
Through the combination of primary and secondary neutrals and their common connections to the same ground electrodes, yes, IMHO.
- Location
- Illinois
- Occupation
- retired electrician
Probably not that far away...the NESC code requires a grounding connection 4 times a mile for the utility system.
- Location
- Placerville, CA, USA
- Occupation
- Retired PV System Designer
I think that domnic's concern is whether there is a metallic connection all the way to the mile-distant pole, not whether there are closer ground electrodes.
kwired
Electron manager
- Location
- NE Nebraska
- Occupation
- EC
I think there are some delta distribution systems out there but most of them are Y, and most use the neutral for most transformers connected to the system. If they don't use the grounded neutral then they need a two bushing transformer instead of a single bushing - more expense. Of course a three phase pad mount won't really be much different as it will use three bushings either way.
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