How would you guys go about this

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nickelec

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I have a customer who is looking to upgrade to an 800a service 3 phase 120/208 is what were working with. There will be approximately 100 servers running between 5 and 8 amps that require a 208 nema twist lock receptacle My question to you gentleman and ladies is how would you go about distributing these loads one Mdp panel with 4 200amp switches feeding 4 panels would be the way I think makes most sense? Anyone else have any ideas?

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nickelec said:
I have a customer who is looking to upgrade to an 800a service 3 phase 120/208 is what were working with. There will be approximately 100 servers running between 5 and 8 amps that require a 208 nema twist lock receptacle My question to you gentleman and ladies is how would you go about distributing these loads one Mdp panel with 4 200amp switches feeding 4 panels would be the way I think makes most sense? Anyone else have any ideas?

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Yes, generally, if you only need 6 or less switches, going mlo with multiple disconnects is the way to go from a cost standpoint.
 
This post is general in nature. Too many missing pieces of information and broad subject. Are these (3) phase 208 connected servers? KW would be a better metric than amps, per server. What about the mechanical cooling for these servers - how will that load be served? With 100 servers we'd expect a UPS and/or generator in the mix somewhere. Is the question how many circuit poles you need? Are there redundancy requirements? You mention upgrading a service...from 800A to 800A? What are the existing loads...
 
electrofelon said:
Yes, generally, if you only need 6 or less switches, going mlo with multiple disconnects is the way to go from a cost standpoint.
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I have personally never done an install this large from the start coming from the street the SECs need to terminate into a main service switch first then into a MDP if I'm not mistaken, any code sections in particular to look into here?

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Are you doing the distribution to the servers as well or just the service? I did a job like this a couple of years ago and we used a pretty slick busduct system similar to the picture below. Ran 200 amp busduct over the server lines and then snapped in the 208V recepts with built in OCP along the line as needed.

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luckylerado said:
Are you doing the distribution to the servers as well or just the service? I did a job like this a couple of years ago and we used a pretty slick busduct system similar to the picture below. Ran 200 amp busduct over the server lines and then snapped in the 208V recepts with built in OCP along the line as needed.

View attachment 17951
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I'm doing the servers also they require a 30a twist lock to a power strip where they will plug in probably 5 cpus

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nickelec said:
I have personally never done an install this large from the start coming from the street the SECs need to terminate into a main service switch first then into a MDP if I'm not mistaken, any code sections in particular to look into here?

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It is permitted to use a service rated MLO panellboard ("MDP") with up to 6 switches instead of a single service disconnect. See 230.71 and 408.36 exception #1. Not having to buy that large main breaker cuts the price down quite a bit. On a recent project, A 1200 I-line MLO with 1 300 amp breaker was only about $2200 (IIRC the breaker was about $300 of that, when bought with the panelboard). An eaton 800 amp MLO with 2 100 amp breakers was $1950 but that included some lug kits for some other panelboards too. I know, kind of add configurations, both of them are long stories ;)
 
electrofelon said:
It is permitted to use a service rated MLO panellboard ("MDP") with up to 6 switches instead of a single service disconnect. See 230.71 and 408.36 exception #1. Not having to buy that large main breaker cuts the price down quite a bit. On a recent project, A 1200 I-line MLO with 1 300 amp breaker was only about $2200 (IIRC the breaker was about $300 of that, when bought with the panelboard). An eaton 800 amp MLO with 2 100 amp breakers was $1950 but that included some lug kits for some other panelboards too. I know, kind of add configurations, both of them are long stories ;)
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I planned on using an 800 amp MDP with 4 200 amp switches. but there are two additional residential units that have separate meters I have to find our wha the Poco wants in order to meter those loads

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I am responsible for multiple server rooms in a large school district but not quite that size. I have the same situation but out IT department provides PDU's provided by the rack manufacturer that allows them to balance the loads themselves. I only supply the rack (actually a row of racks) with 100 amps 3 phase power and the PDU's do the rest.
Im sorry, I don't recall the brand or model off hand.
 
As they said, not enough info-
Servers usually have an IEC C14 or C20 power connection (male, 15/20a), and use cords to whatever is needed (usually C13/C19 or 5-15 receptacles). I try to stay with C13/14 for most things and at 208v.
Servers/etc usually connect to a rack-mounted PDU, when then goes to a single branch circuit.
Do the servers need redundant power?
UPS or generator?
Power for cooling? Heat that goes in has to be taken out.

If you're not concerned with power management, consider 200a 3p panels with 30a 3p branch circuits to rack PDUs (Eaton or APC). Also consider the service itself as one piece and the computer power system as a second.
 
If this gets any kind of standby system connected to it, that can have an impact on whether you would go with a single 800 amp main disconnect or multiple 200 amp main disconnects.
 
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