Feeder riser clamp
Feeder riser clamp
(OP)
Is anyone aware of any non magnetice or non metallic feeder rised clamp to avoid any magnetic coupling and circulating current in the clamp itself?
If you do I will appreciate a quick response.
Thanks a lot in advance.
If you do I will appreciate a quick response.
Thanks a lot in advance.






RE: Feeder riser clamp
RE: Feeder riser clamp
Regards
Marmite
RE: Feeder riser clamp
Those look effective, are they intended for verticle cable runs? The data does not specifically state so I was thinking something like this- htt
Anyway, zazmat, hope this is what you are looking for.
RE: Feeder riser clamp
RE: Feeder riser clamp
Look at M5060
htt
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Feeder riser clamp
Bill,
It appears that the one you sent is for horizontal run and attaches to the unistrut
RE: Feeder riser clamp
Also check out the P2054.
htt
I understand that these are available in stainless.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Feeder riser clamp
RE: Feeder riser clamp
kinda like a plastic/fiberglass mix. I do not know where they got them from. I know that did not help.
however you can just continue to use the metal ones by removing the standard metal bolt and useing a fiber/plastic bolt (path broken) should be able to get these at a bolt supplyer.
RE: Feeder riser clamp
The PVC conduits were strapped with stainless type "P" straps. This was the utility standard.
Yes, one cable per conduit.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Feeder riser clamp
I was certain www.alumaform.com had a riser product in common use by electric utilities that would fit your application but I can't seem to find it online.
RE: Feeder riser clamp
http://www.alumaform.com/equipment_mount.pdf
and scroll down to "conduit Standoff Brackets"
We used the unistrut at one end of the 5" PVC conduits and the Aluma-Form brackets at the pole end.
Thanks for the lead, busbar.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Feeder riser clamp
Thanks for the pointer, waross. With aluminum channel to break the "magnetic loop/circuit", ordinary plated-steel conduit clamps could be used in place of non-ferrous material.
RE: Feeder riser clamp
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Feeder riser clamp
----------------------------------
If we learn from our mistakes I'm getting a great education!
RE: Feeder riser clamp
RE: Feeder riser clamp
It's sometimes called magnetic encirclement. Below about 200 amps it is not much of an issue. Above 200 amps things start to get hot. All three phases (plus neutral if used) should go through the same opening in a magnetic material. This may be a clamp, a conduit or a hole into a panel. The magnetic encirclement may be broken by using a nonmagnetic bolt on a two piece strut clamp if the two magnetic sides of the clamp do not touch.
If single conductor cables enter a panel through separate holes, the holes may be joined by a hacksaw cut. Now you have one oddly shaped hole, but it will avoid the heating.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Feeder riser clamp
Thanks. I understand the issue with single conductors and ferrous materials that encircle the conductor. I assumed that in this case we do have all of the circuit conductors within a single cable, and if that is the case, I still don't understand. That would be a very common field installation.
Don
RE: Feeder riser clamp
RE: Feeder riser clamp
Thanks...that makes sense to me and I have seen the results when this is not done correctly. When I see the word cable, I just normally think of multiple conductors, not single conductors.
Can I ask another question? Why such a big cable? Wouldn't parallel smaller cables be more cost effective?
RE: Feeder riser clamp
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Feeder riser clamp
resq,
I hope it answered your question as well.
Also, how many parallel conductors would you recommend?
This is not my project so I don't have much of the details as to what's the loading is etc.
I raised this question for my information and learning purpose.
The goal was to findout some clamps which can break magnetic coupling when there's only one phase going through them, and not act as CTs with circulating current running in them. I am not much concerned with the size of the cables or paralleling techniques.
RE: Feeder riser clamp
And nothing gained since a single faulted cable will still take out the circuit.