How Many Wires Can be Stuffed....

Home Inspector with The House Whisperer

Overstuffed J-Box Walnut CreekApparently, a lot of wires can be stuffed into an electrical junction box... However, this installation doesn't meet the National Electrical Code requirements.

You could say, the more the merrier... But not in this situation.

Too many wires stuffed into a box can cause dangerous overheating, short-circuiting and fire. The NEC specifies minimum electrical junction box sizes to reduce this risk.

What I'm talking about is 'box fill'.

Electrical junction boxes all have a certain volume that the wires can occupy. This junction box appears to be a 30 cubic inch volume size.

My recommendation was to recommend further review by a licensed electrician... Funny how the home inspection report plays out.

Comments (4)

Richard Iarossi
Coldwell Banker Residential Brokerage - Crofton, MD
Crofton MD Real Estate, Annapolis MD Real Estate


I would have to say when you can't get the plate on, the box is overfilled. That looks like a commercial installation too.


Jan 12, 2012 02:20 PM
Paul Peck
Peck Drywall and Painting serving Brevard County, Florida - Melbourne, FL
Licensed Drywall and Painting Contractor

Glen, That is the most wires I've ever seen in one junction box that's for sure. :P


Jan 12, 2012 02:26 PM
Tom Arstingstall, General Contractor, Dry Rot, Water Damage Sacramento, El Dorado County - (916) 765-5366
Dry Rot and Water Damage Mobile - 916-765-5366 - Placerville, CA
General Contractor, Dry Rot and Water Damage

Looks like it's time for a bigger box Glen :)

I love your photos, they are entertaining.

Jan 12, 2012 04:35 PM
Adrian Willanger
206 909-7536 - Seattle, WA
Profit from my two decades of experience

Glenn, that really looks like an accident that is waiting to happen, thanks for the photo.

Feb 18, 2012 10:22 AM