Disconnecting means

Status
Not open for further replies.
jumper said:
Panel is double protected. Fuses and breaker-twice. Overkill, not a problem, but waste of money.

Fuses protect feeder (from disco) and panel. A MLO panel would work. Think about it.....
Click to expand...

Last week I needed to replace a 200 amp three phase loadcenter type panelboard. The existing one was MB but there was also a service disconnect breaker outside. I knew the breaker was out there, but I completely spaced when it came time to order one and I ordered a MB instead of MLO panel to replace it :slaphead: I blame the originally installer who for some reason un-necessarily installed a MB panel which put MB in the front of my mental rolodex. :rant:

Edit to add: The outside MB was bad, it wouldn't shut off. It would have been $700-$800 to replace. I found a new surplus one on ebay, saved the client $350, so I guess all in all we are about even :)
 
jumper said:
No, it would make no sense.

Main breaker in panel not even required. You have a main service OCPD in the fused disco. It is protecting the panel already.

Think about it.
Click to expand...

Where's the rule that states if the service disconnect is not attached to the structure you have to have a disconnect at the building also?

I cant find it.


JAP>
 
jap said:
Where's the rule that states if the service disconnect is not attached to the structure you have to have a disconnect at the building also?

I cant find it.


JAP>
Click to expand...


I think this is what you are looking for. The problem here is that outside the building is ambiguous.

230.70(A) Location. The service disconnecting means shall be installed
in accordance with 230.70(A)(1), (A)(2), and (A)(3).
(1) Readily Accessible Location. The service disconnecting
means shall be installed at a readily accessible location either
outside of a building or structure or inside nearest the point of
entrance of the service conductors.
Click to expand...
 
jap said:
Where's the rule that states if the service disconnect is not attached to the structure you have to have a disconnect at the building also?

I cant find it.


JAP>
Click to expand...

There is no rule that requires the service disconnect to be attached to the structure.
 
jap said:
Where's the rule that states if the service disconnect is not attached to the structure you have to have a disconnect at the building also?

I cant find it.


JAP>
Click to expand...

Sorry I think this is more accurate

225.32 Location. The disconnecting means shall be installed
either inside or outside of the building or structure served or
where the conductors pass through the building or structure.
The disconnecting means shall be at a readily accessible location
nearest the point of entrance of the conductors. For the
purposes of this section, the requirements in 230.6 shall be
utilized.
Click to expand...
 
jap said:
So if the meter and fused disconnect were on a rack out in the lot nowhere near the structure another disconnect would not be required at the structure itself?



JAP>
Click to expand...
Short answer "yes".
In "real life" Ive the the answer vary by AHJ and by distance how close the two are.
"Nowhere near" will likely mean disconnect at both
 
For services over 300 V PH-PH our POCO requires a disconnect ahead of the meter, I typically use a non fused disconnect if the short circuit current is <10,000 Amps.
Then on the load side we install a fused disconnect, this is service disconnect.
 
augie47 said:
Short answer "yes".
In "real life" Ive the the answer vary by AHJ and by distance how close the two are.
"Nowhere near" will likely mean disconnect at both
Click to expand...

What is the rule that would require a disconnect at both locations?

JAP>
 
As to whether his panel needs a main in it or not at the building that is.


JAP>
 
Status
Not open for further replies.
Top