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Old 10-12-2017, 04:18 PM   #1
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Default Swichboard vs distribuition panel vs power panel

We just moved into a new building and the panel names don't make any sense.
Main panels into building (2) services are called switchboard 1 and 2. these panels have anywhere from 800 amp breakers to 20 amp breakers in them.
Then next panels downstream are called distribution panels. But again they feed from 400 amp breakers down to 20 amp breakers.
Next downstream panels are called HG no idea why. All of the above are 480 volt.
Then we have LT and LG panels that are 208/120v.
Now we added 240 delta panels in and UPS panels.
I am going to rename them all so they make sense.
I can not understand why they use 3 differant names for the 480 system, I could see if switchboad panels only feed other panels since they are main in and DP panels feed other panels, but they all have mixed loads.

How is this
All 480 panels will be PP for Power Panel.
All 240 panels will be LD for Lower Delta
All 208 panels will be LY for Lower Wye
All 120 UPS panels will be LB for Lower Backup.
After the panel name will be column number
Then panel number
Example PP-C1-1
and so on.
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Old 10-12-2017, 05:01 PM   #2
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If you moved into the building, is this now your building?
If so, you can do what you want.
However, there are probably documents, like as-built drawings, owner's manual shop drawings, construction correspondence, one-line diagrams, riser diagrams, coordination studies, etc that are in the hands of many people, including architect, engineer, general contractor, and the switchgear manufacturer using the original nomenclature.

Any future additions, repairs, warranty, replacement/addition of parts, breakers, all reference the panel name. In fact, the manufacture number on every panel references the original name.

Just something to think about...
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Old 10-12-2017, 06:10 PM   #3
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You're looking at a system that has been modified// expanded over the years -- and almost certainly by multiple EEs.

THEY are the source of the nomenclature.

My instinct is to let be -- and to draft sweet as-builts ( paper documents ) that detail what goes to what -- the line-to-load chain.

I would also have sub-copies of said as-builts posted ( plastic sheathed pages in a binder -- those thin plastic binders typically used by salesmen that run about 12 pages ) right at the various equipment.

It's NOT sufficient to have terrific documents back in the office. You want working documents ready to hand if things start going sideways.

As the hurricane season has shown, this happens more often than anyone ever imagines.

Preparation prevents panic.
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Old 10-12-2017, 09:13 PM   #4
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What is the bldg usage ?
Are there other suite's ?

Your new system seams to be more complicated.
Why not just L1 and L2
And H1 and H2

Keep it simple for fire dept. , contractors etc.
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Old 10-12-2017, 09:18 PM   #5
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You don't need to include voltage and system configuration since it is required to be labeled/posted anyway.
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