Attaching wire

[jeepfan93]

Hey gang. I need to run 150' of 2-2-2-4 romex/ structured cabl, to a 100 amp subpanel. I know it can't go in conduit. It will be running along steel I-beam 20' up, to a surface mount subpanel about 6' off the floor. What type of clamps would I use to attach the wire to the I-beam? And when it comes down the outside of the wall, that still is done without conduit, correct? TIA

 

[Full Size 66]

Not exactly sure what wire that is but if you want it to be pretty you could use the plastic conduit called car-flex or maybe kar-flex. Or PVC conduit works well. I just put 150ft. plus of 4/0,4/0,2/0 under ground in a 2 1/2" PVC for my 200 amp sub in my garage. This was detailed to me by my city inspector. Not sure why you need to run your's "free air"?

 

[pattenp]

Romex doesn't com in 2-2-2-4. You must be thinking of SER (Service Entrance) cable. Is it aliminum? #2 Al is good to 90A and it needs to be in conduit if installed it a location that it may be subject to damage.

 

[jeepfan93]

Romex doesn't com in 2-2-2-4. You must be thinking of SER (Service Entrance) cable. Is it aliminum? #2 Al is good to 90A and it needs to be in conduit if installed it a location that it may be subject to damage.

yes sorry. SER cable. hmmm only good to 90 amps. pehaps i need 1/0? OK and then i just conduit on the walls. sounds good. anyone confirm the 1/0 alum amps? thank you

 

[kevin47]

Besides it looks prettier that way lol

 

[jeepfan93]

ok but back to the original question. what would i use to attach the SER to the I-beam?

 

[madosta]

There's a lot of hangers for girders out there. Conduit clamps and conduit would give you the best overall support.

The make clamps for BX typically.

You could probably get by with something like this: http://www.grainger.com/Grainger/PANDUIT-JHook-3HTA7

But I don't know if it's a good idea to hand that heavy of a cable on just a few small contact points.

 

[MrMark]

Romex doesn't com in 2-2-2-4. You must be thinking of SER (Service Entrance) cable. Is it aliminum? #2 Al is good to 90A and it needs to be in conduit if installed it a location that it may be subject to damage.

I used 2/3 romex for my 100 amp subpanel. It was necessary for 100 amps. I attached at with big plastic clamps that were made for it.

 

[pattenp]

I used 2/3 romex for my 100 amp subpanel. It was necessary for 100 amps. I attached at with big plastic clamps that were made for it.

Romex does come in #2 Cu for the three conductor, but not 4 conductor.

 

[pattenp]

yes sorry. SER cable. hmmm only good to 90 amps. pehaps i need 1/0? OK and then i just conduit on the walls. sounds good. anyone confirm the 1/0 alum amps? thank you

1-1-1-3 Aluminum SER can be on a 100A breaker, but it's border line for voltage drop at 3.125% at 100A at 150'. 1/0-1/0-1/0-2 Al SER would be around 2.5% at 100A at 150'. I assume you'd never pull a full 100A, at least you shouldn't on a 100A panel, so the #1 will be fine.



*

 

[jeepfan93]

Ok looks like consensus is 1-1-1-3, individual wire in conduit the entire run from main panel to sub panel. I'll be using 1.5" PVC considering what EMT costs. Using this I know they have dedicated I-beam clamps for this, and I feel better having the clamp on the PVC rather than the jacket of the SER. No I don't think we would be pulling 100amps at once. If so it would be very brief. 220V 40A compressor, 220V welder, 220V plasma cutter, some 20A 110V outlets. Normally one of the welders and a electric or air grinder. Can't grind and weld at the same time and fill time for compressor is very quick. Obviously light and 110 outlets on separate outlets. Sulfur light already have their own run from main panel. Not touching that circuit. Thanks for the help. I did search but didn't find anything specific of what I'm doing, but I do use the board a lot. I search, hence my low post count.

 

[MrMark]

Romex does come in #2 Cu for the three conductor, but not 4 conductor.

What would 4 conductor be used for, three phase?

 

[theoldwizard1]

Romex doesn't com in 2-2-2-4. You must be thinking of SER (Service Entrance) cable. Is it aliminum? #2 Al is good to 90A and it needs to be in conduit if installed it a location that it may be subject to damage.

If it must be run in conduit, is it cheaper to buy THNN/THWN Al ? I know it would be easier to pull individual conductors through conduit.

 

[justsam]

Ok looks like consensus is 1-1-1-3, individual wire in conduit the entire run from main panel to sub panel......

Sulfur light already have their own run from main panel. Not touching that circuit. QUOTE]

Does this mean you will have two different feeds to the same structure? If so, you may want to check with your local jurisdiction that they are OK with that.

 

[jeepfan93]

Ok looks like consensus is 1-1-1-3, individual wire in conduit the entire run from main panel to sub panel......

Sulfur light already have their own run from main panel. Not touching that circuit. QUOTE]

Does this mean you will have two different feeds to the same structure? If so, you may want to check with your local jurisdiction that they are OK with that.

Yes it's cool. From main disconnect there is a seperate feed just for the lights. It's a 60x150 building seperated into 5 units. So it's all one building. Main disconnect has appropriate slots for each unit.