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Old 12-07-2011, 10:36 PM   #1
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Aerial Cable to Garage & Adding Sub Panel


I'm planning on adding a 6 circuit sub-panel & running 240v 60 amp single phase overhead/aerial to my detached garage and looking for advice or if I'm doing something really unsafe/hazardous. (Underground isn't an option being I have an attached Patio with 25 ft of cement flooring) I purchased 2-2-2-4 SER cable that's sunlight resistant and would like to run some 5/16" galvanized aircraft cable between buildings (65') on structure mounted porcelain insulators. Attach the SER cable to the steel messenger cable with black cable ties & stainless ties over rubber splice tape. (Can't find any insulated cable hangers)

So is it safe to run one piece of SER the entire length without any splices/cuts into the outer cover?
Is the SER cable safe to use in this manner or should I get Multiplexed (Quad) cable and splice?
Is the steel aircraft cable a good choice or should I use something else to support the SER?
Should the steel aircraft cable that's between por. insulators be connected to the ground rods @ garage as an extra precaution?
Do I need 2 ground rods 6' apart at the garage or would 1 be OK?
I'm just planning and looking for help/answers before tackling this job. Guess it'll wait till spring now that were getting snow!

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Old 12-07-2011, 11:31 PM   #2
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Aerial Cable to Garage & Adding Sub Panel


There is something called quadplex, which is three insulated conductors with one non-insulated. The non-insulated is your "messenger cable" The biggest issue with your 65' run is the strength of the support at each end.

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Old 12-08-2011, 03:54 AM   #3
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Aerial Cable to Garage & Adding Sub Panel


The quadplex ACSR* cable is the best choice for overhead spans however just be aware not many place will stock the quadplex cable.

The big box store may have to do the speical order otherwise best bet is the local electrical supply centre will have this.

Few case the POCO will have them as well if above two don't have it then the POCO will have it on hand.

Here the photo it will give you the idea what I am refering to this.



The other thing with pretty long span you will need to attached to a very soild part of stucture to support the weight of the overhead ACSR cable.

And the attachment point will have to be higher than the lowest point of the span due the cable will sag.

Merci,
Marc

* ACSR= Alum Conductor Steel Reforced conductor
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Old 12-08-2011, 07:15 PM   #4
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Aerial Cable to Garage & Adding Sub Panel


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Originally Posted by Missouri Bound View Post
There is something called quadplex, which is three insulated conductors with one non-insulated. The non-insulated is your "messenger cable" The biggest issue with your 65' run is the strength of the support at each end.
Thanks for the reply and info. The quadflex wire isn't that easy to come by. Seems most everyone must be doing the underground type installation now days? I have a 14-3 UF cable running overhead now for lights and it's attached to a rack style porcelain insulator bolted through my 8" block garage wall. The other end is attached to a single standard lag screw type por. insulator screwed into the framing member under the eve of my house. Think I'll replace/beef up both supports/insulators while doing the upgrade.
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Old 12-08-2011, 07:48 PM   #5
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Aerial Cable to Garage & Adding Sub Panel


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Originally Posted by frenchelectrican View Post
The quadplex ACSR* cable is the best choice for overhead spans however just be aware not many place will stock the quadplex cable.

The big box store may have to do the speical order otherwise best bet is the local electrical supply centre will have this.

Few case the POCO will have them as well if above two don't have it then the POCO will have it on hand.

Here the photo it will give you the idea what I am refering to this.



The other thing with pretty long span you will need to attached to a very soild part of stucture to support the weight of the overhead ACSR cable.

And the attachment point will have to be higher than the lowest point of the span due the cable will sag.

Merci,
Marc

* ACSR= Alum Conductor Steel Reforced conductor
Hello frenchelectrican,
Thanks for the reply and info. You are correct, the quadflex isn't carried by the big box stores. Guess most installations are underground now days? Wish I could go that route! I understand the quadflex cable is the proper way to run overhead wires. However I already bought enough SER cable for the entire run. And the SER cable does have XHHW-2 insulation.
Is the ACSR cable as strong as the galvanized steel cable? What type of wedge grip clamps are preferred for the messenger wire?

Thanks Again & Cheers,
Clyde
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Old 12-09-2011, 07:43 AM   #6
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Aerial Cable to Garage & Adding Sub Panel


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Originally Posted by CDW59 View Post
Hello frenchelectrican,
Thanks for the reply and info. You are correct, the quadflex isn't carried by the big box stores. Guess most installations are underground now days? Wish I could go that route! I understand the quadflex cable is the proper way to run overhead wires. However I already bought enough SER cable for the entire run. And the SER cable does have XHHW-2 insulation.
Is the ACSR cable as strong as the galvanized steel cable? What type of wedge grip clamps are preferred for the messenger wire?

Thanks Again & Cheers,
Clyde
The triplex is very common item but not the quadplex cable verison that why they are not super common item and I do used them on few three phase appactions and alot of single phase useage on MWBC or Feeder useage.

For the SER if it marked " sunlight reslent ( SP ) " it should be ok but to support you will need gavlaized aircraft cable and for 65 feet span you will have to use 3/16 inch cable { a little larger will work fine to support the weight espcally in wintertime when the ice wrap up the cable and can add alot of weight in hurry.}

The ACSR cable is very common item in POCO useage and you will see them alot on the primary overhead lines that what they used on long spans and yeah they are very strong as well.

For wedge grip clamps there are couple verison but a double vee type is the most common and not very hard to use once you get the idea how it work

I will post the photo so you get more clear idea with it



To take it apart you will have to slide it opposite way { inward direction } and you may need a hammer to tap it.
To tighten them down just do the reverse and tap it, it will lock in.

There are few different size aviable so get the correct size { it will cover the X number of conductor size }

That item I posted it used in both USA and France so it pretty common item and with # 2 ACSR cable the wedge clamp should run about 8 Euros each so you will need two of them.

I will post more details in a bit.

Merci,
Marc

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