Plywood backer required?

[infinity]

Four 1/4-20 toggle bolts will hold quite a bit of weight.

I agree especially with two layers of 5/8 rock.

Even if you use strut you would still toggle bolt the strut to the wall.

 

[roger]

I agree especially with two layers of 5/8 rock.

Even if you use strut you would still toggle bolt the strut to the wall.

Holding the weight wouldn't be the issue, it would be the designs fire resistive ability being compromised.

 

[acin]

Build a 2x4 wall width of the panel against the sheet rock

 

[tom baker]

I agree especially with two layers of 5/8 rock.

Even if you use strut you would still toggle bolt the strut to the wall.

Would it not be better to lag the strut into studs? Faster than toggle bolts. Not sure if this would work with steel studs

 

[gadfly56]

Four 1/4-20 toggle bolts will hold quite a bit of weight.

The one's I've used are 75# a piece IIRC.

 

[LarryFine]

Not sure if this would work with steel studs

I have used these for hanging TVs on steel-stud walls. A small hole-saw makes perfect holes through the steel stud.

 

[tom baker]

I have used these for hanging TVs on steel-stud walls. A small hole-saw makes perfect holes through the steel stud.

View attachment 2563830

Togglers. Much better than toggle bolts
I seldom used either as all my buildings were concrete

 

[gadfly56]

I have used these for hanging TVs on steel-stud walls. A small hole-saw makes perfect holes through the steel stud.

View attachment 2563830

Back when I was working as a tech, I tried these without much success. There might be a knack that I didn't have.

 

[sparky1118]

We always install our electrical panels on plywood. I don’t think it’s required but it does look a lot neater imo.


Sent from my iPhone using Tapatalk Pro

 

[SceneryDriver]

Back when I was working as a tech, I tried these without much success. There might be a knack that I didn't have.

There are good ones and bad ones. The good ones work really well. The bad (cheap) ones' plastic pieces are brittle and will snap, rendering the toggle useless and making you crazy. Also, it's hard to tell when you buy them at the big box store if they're good or terrible. I try to avoid them too; I had to use them in my own block wall basement, as the block was too soft for any other type of expanding anchors.


SceneryDriver

 

[scook56]

New one for me on this one. Installing a panel in a commercial office building, 277/480. Mounted it on a double sheetrock fire wall. The electrical inspector is requiring that I first mount plywood to the wall and mount my panel to that. I’m not finding anything NEC to back it up, maybe it’s a local thing. Is there anything in the NEC that calls those out??

Multiple assemblies mounted on the fire wall:
Panels, troughs, supports for conduits, etc.
Covered the wall, 8ft W by 12ft H, 3/4 plywood and intumescent paint.
This served as excellent mounting for all items.

 

[lordofthisworld]

Curious as to your mounting method. Toggle bolts?

Lag bolts

 

[lordofthisworld]

New one for me on this one. Installing a panel in a commercial office building, 277/480. Mounted it on a double sheetrock fire wall. The electrical inspector is requiring that I first mount plywood to the wall and mount my panel to that. I’m not finding anything NEC to back it up, maybe it’s a local thing. Is there anything in the NEC that calls those out??

I don't think it's code but majority of electric rooms now are putting up 3/4" plywood to support the panels and other cabinets.