How to Protect Electrical Service from Flood Zone

Location
NJ
What is the highest mounting height for my Service Disconnect and Main Distribution Panels if the flood zone is 5ft high for a commercial space in a basement.

There is a natural body of water be hide the building, so I tried to refer to Article 682, but I was little confused.
 

kwired

Electron manager
Location
NE Nebraska
What is the highest mounting height for my Service Disconnect and Main Distribution Panels if the flood zone is 5ft high for a commercial space in a basement.

There is a natural body of water be hide the building, so I tried to refer to Article 682, but I was little confused.
I don't think 682 applies to anything in said building.

Only way you are going to protect this is with good water tight construction methods, and even then still are likely to need some drainage/pumping system with standby power, because you are not likely to keep it completely water tight.
 

kwired

Electron manager
Location
NE Nebraska
Thank you for the help.

What code section would I need to look up for maximum height for panels and disconnect when in a flood zone?
Code or no code,iIf you have equipment in a basement and in a flood zone, isn't the basement (or at least the portion of it that is below grade) going to be below the flood line? Only way to assure it doesn't get flooded is drainage/pumping systems with back up power. Even then there is still some risk of failure and it floods anyway. This is not the same thing as putting equipment out in the open near a body of water like what would be covered in art 682 either. If you know the basement is going to be prone to flooding, other building codes may come into play. That once in a hundred years flooding of such a basement is not normally something we design for. If it happens more than once, then maybe a different design is a good idea whether there is codes driving it or not.
 

oldsparky52

Senior Member
Around here, your equipment must be above the flood zone. Some areas require flood level +2'. You mount it no lower than this, and someone needs to build platform and stairs to access the equipment.

We don't have basements here.
 

kwired

Electron manager
Location
NE Nebraska
Your highest breaker can only be 6' 7" above the floor to the center of the switch.
Wasn't related to flooding potential, but ran an new service into an old boiler room in an old school building once, this room had additional steps to go even lower than the rest of the basement rooms. my incoming raceways entered bottom back wall of an I line panel, entering top portion of panel would have been too shallow burial depth though, well maybe not too shallow for NEC but not as deep as I wanted it to be, without setting bottom of panel lower than I wanted that to be. The compromise - penetrated the wall nearly 8 feet below grade- highest breakers were abovt 6' 7" so we build a raised deck at least the size of required working space in front of the panel.

This room originally had a huge steam boiler in it and is only reason it was built that way. Today there are two boilers in it, each about the size of a 2 drawer file cabinet.
 

Cow

Senior Member
Location
Eastern Oregon
put equipment high enough and build a standing platform around the equipment for servicing.
I haven't done it, but I have seen pictures of equipment mounted this way, up high on platforms with stair access.

May be expensive up front, but at least you aren't replacing the panel and other electrical components every time it floods....
 

kwired

Electron manager
Location
NE Nebraska
Originally Posted by kwired

The compromise - penetrated the wall nearly 8 feet below grade-
Shame on you,,,, :)


JAP>
It did get me into some trouble, I hit a water line while excavating that I wasn't even thinking about being there. Normally I am never deep enough to be concerned about water lines. 1-1/4 line lets out a lot of water pretty fast too, luckily there was a shut off in the room we were bringing service into and it didn't run for very long.
 

jap

Senior Member
We penetrated a bank basement wall below grade and another guy hit the yard sprinkler system and it flooded the basement through the penetration we made.

Never again will I penetrate a basement wall below grade without someone else signing off on it first.

There's no good way to seal off such a penetration.


JAP>
 

Cow

Senior Member
Location
Eastern Oregon
There's no good way to seal off such a penetration.


JAP>
I disagree.

For reference, we just ran three 4 inch conduits into a basement 3' below the water table.

If you have the hole cored properly, and use a linkseal, combined with polywater fst foam, there will not be an issue.

https://www.polywater.com/product/polywater-fst-foam-duct-sealant/

http://www.cooperindustries.com/content/public/en/crouse-hinds/products/fittingsglands/cable_glands_andcableaccessories/cable_accessories/link-seal_environmentalsealforconduit.html
 
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