Box clamps for NM wire

[mike93lx]

What do you guys use? I've tended to go with the standard twin screw NM clamps, but have recently tried some of the snap in connectors, but they never feel solid or that easy to use. Maybe I am using crappy ones?

 

[sparky 1971]

I use the old fashioned two screw claps myself. I do have a few of the plastic snap in connectors but those only get used when there is one cable.

 

[rmanrman]

What do you guys use? I've tended to go with the standard twin screw NM clamps, but have recently tried some of the snap in connectors, but they never feel solid or that easy to use. Maybe I am using crappy ones?

Retired electrician here. Been using the two screw metal 1/2 inch ko connectors for ever never failed but takes time. Used plastic snap in and hitting gently with flathead screwdriver I punchred the cable nfg
Then if I needed to recable removal almost destroyed the plastic.

 

[mike93lx]

Retired electrician here. Been using the two screw metal 1/2 inch ko connectors for ever never failed but takes time. Used plastic snap in and hitting gently with flathead screwdriver I punchred the cable nfg
Then if I needed to recable removal almost destroyed the plastic.

Yeah, a big part of what I don't like on the plastic clamps are how much of a PIA it is to adjust or remove wire.

 

[u2slow]

I use a mix of the various metallic locknut types and the grey plastic snap-in ones. Big fan of the duplex metallic connectors. Just depends on what I'm doing. The set screws can sometimes get in the way of each other or be difficult to access.

 

[nadogail]

The plastic clamps are good for cheap fast production, the Two Screw metal clamps are more durable.

 

[walrus]

If you have to move the wire backwards(out of the box) you have to release the button from the box and then move the wire.

 

[mike93lx]

I use a mix of the various metallic locknut types and the grey plastic snap-in ones. Big fan of the duplex metallic connectors. Just depends on what I'm doing. The set screws can sometimes get in the way of each other or be difficult to access.

These? For NM?

Halex 3/8 in. Flexible Metal Conduit (FMC) Duplex Connectors (2-Pack)

Halex 3/8 in. Flexible Metal Conduit (FMC) Duplex Connectors (2-Pack) 21580 - The Home Depot

Enjoy the Halex 3/8 in. Flexible Duplex Connectors (2-Pack) 21580, UL- and CSA listed designed to connect and bond 2 pieces of flexible metal conduit, AC, MC or NM cable to a steel outlet box at The Home

www.homedepot.com

SKU# 100146695

 

[yatg]

These? For NM?

Halex 3/8 in. Flexible Metal Conduit (FMC) Duplex Connectors (2-Pack)

Halex 3/8 in. Flexible Metal Conduit (FMC) Duplex Connectors (2-Pack) 21580 - The Home Depot

Enjoy the Halex 3/8 in. Flexible Duplex Connectors (2-Pack) 21580, UL- and CSA listed designed to connect and bond 2 pieces of flexible metal conduit, AC, MC or NM cable to a steel outlet box at The Home

www.homedepot.com

SKU# 100146695

Those look like a pain, and they are over twice the cost of 2 single NM clamps.
The 3/8" Halex NM connectors are listed for 2 14/2 cables (not 12/2).

 

[SlappyWhite]

My go-to is the "Iberville 70-MFP" single screw clamp, the main reason is I have had good experience with them and more importantly they are rated for both NM and armoured cable. They also work nicely at the panel. Once I had to show the package to one inspector as he thought they were AC only....



I do use others if space is limited or for special applications.... very rarely the plastic push in ones.

 

[mike93lx]

My go-to is the "Iberville 70-MFP" single screw clamp, the main reason is I have had good experience with them and more importantly they are rated for both NM and armoured cable. They also work nicely at the panel. Once I had to show the package to one inspector as he thought they were AC only....



I do use others if space is limited or for special applications.... very rarely the plastic push in ones.

I like the single screw setup. Thanks

Quick search seems to indicate these are a Canadian thing

 

[SlappyWhite]

I like the single screw setup. Thanks

Quick search seems to indicate these are a Canadian thing

That rubs, sometimes we keep all the good stuff for ourselves /s

 

[alfredeneuman]

but have recently tried some of the snap in connectors, but they never feel solid or that easy to use.

If you're talking about the gray plastic ones they don't need to feel solid.
They do a good job of not pulling of the knockout and protecting the cable from the sharp edges.
To install them you just take a pair of Channelocks, insert the wedge, and squeeze.

 

[u2slow]

These? For NM?

Halex 3/8 in. Flexible Metal Conduit (FMC) Duplex Connectors (2-Pack)

Halex 3/8 in. Flexible Metal Conduit (FMC) Duplex Connectors (2-Pack) 21580 - The Home Depot

Enjoy the Halex 3/8 in. Flexible Duplex Connectors (2-Pack) 21580, UL- and CSA listed designed to connect and bond 2 pieces of flexible metal conduit, AC, MC or NM cable to a steel outlet box at The Home

www.homedepot.com

SKU# 100146695

I get them dual rated for NM and AC. The key is the stamped-steel 'shoe' instead of die cast.

To me, the extra cost doesn't matter when you need/want two cables into one ko.

https://www.lowes.ca/product/conduit-fittings/iberville-duplex-connector-nmd90ac90-flip-pack-of-30-955369

 

[mike93lx]

If you're talking about the gray plastic ones they don't need to feel solid.
They do a good job of not pulling of the knockout and protecting the cable from the sharp edges.
To install them you just take a pair of Channelocks, insert the wedge, and squeeze.

Fair enough

 

[rlitman]

The plastic clamps are good for cheap fast production, the Two Screw metal clamps are more durable.

Both have their place. I don't like how the plastic clamps hold the wire, but if I can secure it with a staple, that's immaterial.
I recently used a bunch of metal push-in clamps. They click into the box and don't require a lock nut on the inside, and where they fit (I ran into a few situations where they don't), I kind of like these:


The only ones I refuse to use are these: