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Old 07-01-2012, 10:02 PM   #31
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8 unit apartments and grounding rods


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Im a little confused on what exactly this building has. is this an over head or underground service?
Underground .... With two separate boxes ...two separate conduits run for each enclosure. Both conduits lead to the one transformer box.

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Old 07-01-2012, 10:03 PM   #32
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Underground .... With two separate boxes ...two separate conduits run for each enclosure. Both conduits lead to the one transformer box.
Thanks, much better visual now.
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Old 07-01-2012, 10:04 PM   #33
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Was there permit pulled? This doesn't sound NEC compliant at all.
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Old 07-01-2012, 11:11 PM   #34
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my advice to you is to switch companies if you ever want to learn anything. Sounds like you work for a bunch of shoemakers.

i can see this if it was a really old building but with a new building install this whole thing seems to be wrong in every way. I haven't had alot of experience with apartments but wouldn't it make more sense to come into one disconnect and then split for the eight meters from a splitter(if each unit has it's own meter). or come into a main board with a main disconnect and then run everything out from there? Not sure what the legalities are on it if someone could fill me in i'd like to know.
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Old 07-01-2012, 11:15 PM   #35
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my advice to you is to switch companies if you ever want to learn anything. Sounds like you work for a bunch of shoemakers.

i can see this if it was a really old building but with a new building install this whole thing seems to be wrong in every way. I haven't had alot of experience with apartments but wouldn't it make more sense to come into one disconnect and then split for the eight meters from a splitter(if each unit has it's own meter). or come into a main board with a main disconnect and then run everything out from there? Not sure what the legalities are on it if someone could fill me in i'd like to know.
You can only have 6 disconnects before a main breaker is required.
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Old 07-01-2012, 11:21 PM   #36
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i get that your only allowed 6, i just didn't know what the prefered method of install would be. Using a distribution board or using a main disconnect and a splitter to the individual disconnects.
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Old 07-01-2012, 11:24 PM   #37
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Typically in this situation you would have an 800A main disco, then the two stacks would bolt to the disco. There wouldn't be any wiring between the disco and the stacks. They would all mechanically connect...buss bars bolted together.

something like this...

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Old 07-01-2012, 11:25 PM   #38
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Typically in this situation you would have an 800A main disco, then the two stacks would bolt to the disco. There wouldn't be any wiring between the disco and the stacks. They would all mechanically connect...buss bars bolted together.

something like this...

nice, thanks
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Old 07-02-2012, 06:17 AM   #39
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I'm doing a 7 pack today, ugh... Going to be a long day, as this is a service upgrade.
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Old 07-02-2012, 07:21 AM   #40
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I am really going to try and get to the bottom of the installation. Later today hopefully I can have more info. Funny thing is we have done this same exact install on 4 of these new 8 unit apartments and have passed everytime. Am I correct in saying that you only. Need two services if the load exceeds 2000 amps?
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Old 07-02-2012, 07:24 AM   #41
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No, but that is one of the exemptions that would allow for two services on the same building.
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Old 07-02-2012, 11:55 AM   #42
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I am really going to try and get to the bottom of the installation. Later today hopefully I can have more info.
Some pics would be very helpful.
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Old 07-02-2012, 04:32 PM   #43
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Some pics would be very helpful.
I didn't get a chance to get out there this morning but I am headed out to the apartments shortly. I will take some pics and get to the bottom of it. Matter of fact I talked with my bosses about this today, I rarely talk with them, and they said it was two separate services. Now I have read 230.2 in the 2008 NEC and the way I interpret it is that this type of installation should be considered one service. But then i start thinking about the other code (230.71)where no more than 6 disconnects grouped at any one location are allowed per service. So maybe my superiors are calling it two separate services for this purpose, since there are 8 disconnects at this location........hell they specifically told me that we did not need to bond the two boxes because it was two separate services. I said ok and went on my merry way.......still unconvinced though. I'll get some pics and most in a little while. Shouldnt we still bond the two metal enclosures at the same building regardless?
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Old 07-02-2012, 06:57 PM   #44
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Sorry guys...... I have pics but am working on figuring out how to post with iPad. Wish DIY had its own app.....like electrician talk......make it a lot easier.
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Old 07-02-2012, 08:29 PM   #45
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If the building has firewalls it could quite possibly be two structures...

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