RGS Question

A

Alwayslearningelec

Senior Member
Location
NJ
Occupation
Estimator
This is a 2" conduit outdoors. Would Ericksons be needed for the 90's?

I ran into a job once where the electrician said he could not spin the elbow on and needed to use them?

Are they always needed where you 90 with RGS? What determines whether or not you need them? Only when you can't spin on elbow? If so them what determines when you can spin on elbow? At every 90 you can't spin on?
1737046057782.png
 
You might not need them but the way it's drawn you'll probably need LB conduit bodies at the external corners. Running RMC is part work, part art form. A skilled electrician can often do the job without Ericksons.
 
If I am not mistaken a Erikson is used as an adapter and can be wrench tightened instead of needing to rotate conduit or body of the elbow to be tightened?
 
Elect117 said:
If I am not mistaken a Erikson is used as an adapter and can be wrench tightened instead of needing to rotate conduit or body of the elbow to be tightened?
Click to expand...
Yes it's similar to a 3 part plumbing union where you cannot spin on the pipe. There are two basic types, Erickson which is a three piece coupling and a split coupling which has external bolts that you tighten.
 
infinity said:
You might not need them but the way it's drawn you'll probably need LB conduit bodies at the external corners. Running RMC is part work, part art form. A skilled electrician can often do the job without Ericksons.
Click to expand...
Ok so the internal elbows would possibly need Ericksons? Why exactly may a skilled electrician not have to use them? I'd like to know so I can speak intelligently. Thanks
 
Alwayslearningelec said:
Ok so the internal elbows would possibly need Ericksons? Why exactly may a skilled electrician not have to use them?
Click to expand...
By assembling the runs in the best order, or by making assemblies before securing them in place.

This is usually better with factory elbows than field bending, which requires more spinning space.
 
LarryFine said:
By assembling the runs in the best order, or by making assemblies before securing them in place.

This is usually better with factory elbows than field bending, which requires more spinning space.
Click to expand...
If you field bend then no need for Erickson obviously.

See since I'm not electrician I can't envision or understand what you mean by "By assembling the runs in the best order, or by making assemblies before securing them in place."
 
Alwayslearningelec said:
If you field bend then no need for Erickson obviously.

See since I'm not electrician I can't envision or understand what you mean by "By assembling the runs in the best order, or by making assemblies before securing them in place."
Click to expand...
If you bend an elbow that is the middle of a length of RMC it will be over 5' long. It's pretty hard to spin on a 5' elbow against a building wall. If you bend the elbow is so that it is 18" long you can probably do it by removing a few straps on the straight run to spin it on. A good electrician would know that he had to bend a short elbow to spin it on. With the 5' elbow you'll need an Erickson. Manufactured elbows are even shorter than those that are field bent so they can be spun on more easily.
 
I will post some pics a little later of a job I did running two 2" RGS conduits from the basement of a 10-story apartment building to the rooftop for a cellular-phone site.

I started at the top, over the parapet wall, around a wide ledge, back against the wall, a couple of offsets, and joined to two existing 4" RGSs, and only one Erickson per run.
 
Alwayslearningelec said:
See since I'm not electrician I can't envision or understand what you mean by "By assembling the runs in the best order, or by making assemblies before securing them in place."
Click to expand...
It's not necessarily electrical; a plumber running threaded pipe would face the exact same challenges.

This is more about spacial 3-D understanding and physical puzzle solving.

I wish we could meet in the plumbing department at a Home Depot and play with some fittings.
 
In the drawing shown above envision measuring the whole thing and building it on the floor and lifting the whole thing into place.

Weather you can do that or not depends on manpower you would probably need 4 workers to handle this and if you have some unknown obstructions, it may not work.

If i was estimating this I would probably use 2 LBs for external elbows, 2 factory elbows and 1 Erickson. That should cover it.
 
LarryFine said:
I will post some pics a little later of a job I did running two 2" RGS conduits from the basement of a 10-story apartment building to the rooftop for a cellular-phone site.

I started at the top, over the parapet wall, around a wide ledge, back against the wall, a couple of offsets, and joined to two existing 4" RGSs, and only one Erickson per run.
Click to expand...
Thanks.
 
You generally only need them when both ends of the run, or the destination end like in my example, are fixed in place, and you just can't pick up the building and rotate it to thread together that last joint.
 
My question is actually for this run. (10) 4" RGS conduits that run along the wall then turn right toward the window. PM said they need Erickson for all the conduits.

1737049169109.png
 
Alwayslearningelec said:
My question is actually for this run. (10) 4" RGS conduits that run along the wall then turn right toward the window. PM said they need Erickson for all the conduits.
Click to expand...
I disagree, from what I can see. Is that one run wrapped around a corner, or two separate runs?

How many layers of conduit deep? What is the overhead view?
 
Alwayslearningelec said:
My question is actually for this run. (10) 4" RGS conduits that run along the wall then turn right toward the window. PM said they need Erickson for all the conduits.

View attachment 2575214
Click to expand...
I agree. The only other way would be to make up the conduit with the elbows and then drop them into to pull box. The extra labor probably isn't worth saving the cost of the Erickson.
 
It seems perfectly doable to me, again from what I can glean here.

Is it just the ten runs from box to box with one elbow each?

This is one reason I don't like to price work without seeing the site.
 
Well Infinity disagrees..jk :). Sure one would not know until being onsite. But they are saying they need Ericksons without being onsite yet.

Again I'm not clear how you would install it so Erickson would NOT be needed.

This is the routing(top view).

1737060928845.png
 
You must log in or register to reply here.
Top