I think this video from eight years ago is getting to be a little out of date. This past summer the electric utility replaced the towers and cables of one of the distribution systems for substations across North Dallas. Since the electrical easement was recently used to construct a new bicycle path, I had a chance to closely examine the new cables before they were hung from the new poles which replaced the old towers. I believe the cable I looked at was a larger gauge than anything shown in this video. It was still constructed of aluminum strands surrounding a steel cable, but the individual strands of aluminum have a cross sectional shape that is rectangular with rounded corners. The conductors are spiraled side-by-side around the steel cable so that the flattened sides of the strands fit together and form a near-perfect circular shape to the complete cable. Not sure what advantage this method provides over the usual round strand method, but it sure makes a neat installation.
I am an enthusiast in the area of medium voltage sizing, and indeed, you can use bare copper wires 8 to 6 and 4 AWG without any problems for small neighborhood branches with loads between 1.5MVA. You normally use 4/0 ACSR in substation output trunk feeders, with loads of up to 5MVA,with 13.8kV. 336.4, 477 and 795mcm ACSR? Well, there we are dealing with huge medium voltage trunk feeders, typically 8 to 12MVA,with 13.8kV for example. At 24 and 34.5kV using these same wires, you can even have more MVA flowing. Here where I live, 4/0 and 336.4 is already more than excellent. 😂
docshiznit when you’re presenting to the class and you’re not sure what is what because you didn’t study and you pull the “ I hope they don’t notice it “ trick 😂😂😂😂😂
This is a really nice video. I’ve never seen all these conductors together. However, I’m disappointed that there was one that isn’t there that I’m curious about. Sometimes now there’s a green conductor that has three green wires in a twist. I don’t see it much but when I do see it, it connects down from high tensions and hangs in the lowest spot on the poles. Between high tensions and the green cable, there are white insulators but no large transformers. What is this cable? No one seems to know. I’m assuming it is high voltage but insulated so it can hang lower?
That is bundled primary cable. Very expensive relative to open wire or aerial spacer cable/Hendrix primaries, but the neutral shields and grounded messenger mean it can be much closer to the comms space on poles and in midspans.
Because house wiring back in the 70's that used aluminum wire had problems that caused them to get hot at connection points. Usually by the installer. A lot of municipalities outlawed them.
at the utility I work for in Canada we don't have a spec for 1/0 triplex but #2 is 165a summer 205a winter. we do have a spec for 1/0 Quad 200a and 250a. I can personally tell you lots of utilities will let you have a 200a service on #2 triplex. Hell, I've seen it on #4 triplex. remember its free air so you can typically add 50% current carrying capacity. Also, remember every utility is different and they all make their own rules.
In overhead, definitely. Most North American residential overheads are 1/0 regardless of service level at the meter, due to the wire being in free air, where heat is readily dissipated. Once in a raceway (conduit, pipe, or cable) the ampacity and cable size is adjusted accordingly. A 100 amp service will usually be #4 copper/2 aluminum, a 150 will be #1 cu, 1/0Al, and a 200 amp service will be 2/0Cu or 4/0Al after the weatherhead. At work, underground laterals in new houses, are almost always direct buried 4/0 Aluminum triple rated 'type USE/RHW/URD' tri-rated triplex cable. Except that one time, where a crew mistakenly laid 250-MCM cables to a house. Apparently, the stockman at the warehouse gave them the wrong size cable. Harmless for the 30-foot lateral, but at the same time, a class 225/400 amp service could be dropped in no problem. The lugs on the meter pedestal, breaker panel in the house had no trouble either, as both were good to 350MCM. On a side note, the NEC that I as an Inside Wireman/electrican use, is much more conservative with ampacity than the NESC that the power company's Outside Wireman uses.
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I think this video from eight years ago is getting to be a little out of date. This past summer the electric utility replaced the towers and cables of one of the distribution systems for substations across North Dallas. Since the electrical easement was recently used to construct a new bicycle path, I had a chance to closely examine the new cables before they were hung from the new poles which replaced the old towers. I believe the cable I looked at was a larger gauge than anything shown in this video. It was still constructed of aluminum strands surrounding a steel cable, but the individual strands of aluminum have a cross sectional shape that is rectangular with rounded corners. The conductors are spiraled side-by-side around the steel cable so that the flattened sides of the strands fit together and form a near-perfect circular shape to the complete cable. Not sure what advantage this method provides over the usual round strand method, but it sure makes a neat installation.
I am an enthusiast in the area of medium voltage sizing, and indeed, you can use bare copper wires 8 to 6 and 4 AWG without any problems for small neighborhood branches with loads between 1.5MVA. You normally use 4/0 ACSR in substation output trunk feeders, with loads of up to 5MVA,with 13.8kV.
336.4, 477 and 795mcm ACSR? Well, there we are dealing with huge medium voltage trunk feeders, typically 8 to 12MVA,with 13.8kV for example. At 24 and 34.5kV using these same wires, you can even have more MVA flowing. Here where I live, 4/0 and 336.4 is already more than excellent. 😂
You made a very helpful video
Thank you so much for this video.
What size wire do I need for a 15kva transformer to 15kva service panel meter assembly .
2 conductor with 1 bare ground.
I was actually looking for the wire size just under the 477 acsr. You failed I mention the 477 and the next size down :-(
try 397.5mcm
If you're not going to label the wire sizes on the board, you shouldn't 'point' with your fingers laying across three wires at once.
docshiznit when you’re presenting to the class and you’re not sure what is what because you didn’t study and you pull the “ I hope they don’t notice it “ trick 😂😂😂😂😂
This is a really nice video. I’ve never seen all these conductors together. However, I’m disappointed that there was one that isn’t there that I’m curious about. Sometimes now there’s a green conductor that has three green wires in a twist. I don’t see it much but when I do see it, it connects down from high tensions and hangs in the lowest spot on the poles. Between high tensions and the green cable, there are white insulators but no large transformers. What is this cable? No one seems to know. I’m assuming it is high voltage but insulated so it can hang lower?
That is bundled primary cable. Very expensive relative to open wire or aerial spacer cable/Hendrix primaries, but the neutral shields and grounded messenger mean it can be much closer to the comms space on poles and in midspans.
Since COPPER is expensive, do you recycle/reuse the old copper conductors?
yes scrap yard$$$
So if aluminum is used in over head than why are we using copper for house wireing?
Because house wiring back in the 70's that used aluminum wire had problems that caused them to get hot at connection points. Usually by the installer. A lot of municipalities outlawed them.
@@denniscurless904 then use it for lighting instead... it's cheaper
I want to know how they made the resistor go back together like that.
It would be very handy to be able to do that.
What's the current carrying capacity of the 1/0 triplex cable? Is that suitable for 100 or 200 amp service?
at the utility I work for in Canada we don't have a spec for 1/0 triplex but #2 is 165a summer 205a winter. we do have a spec for 1/0 Quad 200a and 250a. I can personally tell you lots of utilities will let you have a 200a service on #2 triplex. Hell, I've seen it on #4 triplex. remember its free air so you can typically add 50% current carrying capacity. Also, remember every utility is different and they all make their own rules.
Can anyone name these top to bottom please? It’d be a great help!
The thickest ACSR conductor is common for 500 kV
what is the meaning of 6/1/3.00mm Acsr conductor ? can u ans me
is one ott ACSR ok to use for 200 amp service panel ?
In overhead, definitely.
Most North American residential overheads are 1/0 regardless of service level at the meter, due to the wire being in free air, where heat is readily dissipated. Once in a raceway (conduit, pipe, or cable) the ampacity and cable size is adjusted accordingly. A 100 amp service will usually be #4 copper/2 aluminum, a 150 will be #1 cu, 1/0Al, and a 200 amp service will be 2/0Cu or 4/0Al after the weatherhead.
At work, underground laterals in new houses, are almost always direct buried 4/0 Aluminum triple rated 'type USE/RHW/URD' tri-rated triplex cable. Except that one time, where a crew mistakenly laid 250-MCM cables to a house. Apparently, the stockman at the warehouse gave them the wrong size cable. Harmless for the 30-foot lateral, but at the same time, a class 225/400 amp service could be dropped in no problem. The lugs on the meter pedestal, breaker panel in the house had no trouble either, as both were good to 350MCM.
On a side note, the NEC that I as an Inside Wireman/electrican use, is much more conservative with ampacity than the NESC that the power company's Outside Wireman uses.
What are the different thicknesses
thats what she said
Sir how to find transaction line 220 kv,66kv 33kv what based calculate