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Old 01-31-2013, 11:05 AM   #1
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3 phase service panel and more


Hello,

I have to update an existing 3 phase in small commercial building and add 2 lines with 4 wire connection for a bun coffee machine
How to make it better?
Where to get neutral and ground

BUN machine needs 4 wire 208 service line
Please, see image with comments

Thanks beforehand for any recommendations

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Old 01-31-2013, 11:15 AM   #2
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You need an electrician!

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Old 01-31-2013, 11:15 AM   #3
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A coffee maker that requires 3 phase!!!??
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Old 01-31-2013, 11:34 AM   #4
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Yes they manufacture coffee makers that are almost as big as water heaters.

If the 3 phase service does not already have a neutral then it might not be possible to connect up equipment that needs a neutral.

Generally you may not run 208 volt equipment on a 240 volt 3 phase system due to overvoltage considerations.

In many cities you need an electrician's license to work in commercial buildings or multi-family residential buildings. Small items such as replacing a broken receptacle are usually exempt from this requirement.
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Last edited by AllanJ; 01-31-2013 at 11:37 AM.
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Old 01-31-2013, 12:32 PM   #5
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I can add/run that line myself but want to do it by code.

The upper -second panel not in use anymore.

The only question is about the neutral for the coffeemaker.
I is 2 phase 208 : one black, red, white, green.
there is a "smart" board inside of it and it is connected with transformer.
So, I am not sureif I can just run ground and short it with neutral.
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Old 01-31-2013, 02:57 PM   #6
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You may not run just the ground and short it with neutral.

Neutral must run separately out of the main panel or a subpanel to wherever it is going.

What is the voltage from hot to ground (each leg) at your main panel?
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Old 01-31-2013, 03:22 PM   #7
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Sorry. I do not help people working this far out of their area of expertise, trade, liability, insurance, etc.
If you have to ask how to wire a simple 3-phase Bunn machine you should NOT be doing this work.

HIRE AN ELECTRICIAN. This is NOT a job for a handyman.
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Answers based on the 2008 & 2011 NEC.
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Old 01-31-2013, 03:46 PM   #8
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This thread, in my opinion, is dangerous to anyone who may try this. There are several professional electricians have commented and it seems they feel the same. Therefore I am locking the thread. Thank you.

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