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Hangar Electrical Work

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billhuntersemail(at)gmail
Guest

Posted: Sat May 14, 2022 11:20 am Post subject: Hangar Electrical Work

Hi All.

     

     So this question is about a hangar at an airport albeit a slight off     topic question for the multi-knowledgeable among us... 

     

     I have a 50 amp RV receptacle box mounted to the outer side wall of     my steel hangar and it is fed by the four red/green/white/black     wires that are routed from the inside of the building through metal     conduit that is inserted through the side wall out to the steel box     where the receptacle is installed as per code.

     

     I want to decommission that receptacle so I can extend the wires     outside underground to a newly installed pedestal about 20 feet     away...in other words I need to open the existing metal box,     eliminate the receptacle and put a cover over the opening, run a     conduit from the bottom of the existing box down the outside hangar     wall and into the ground and then run it under ground out horizontal     20 feet, and then up the side of a newly installed "pedestal" (4X4     pressure treated post sticking out of the ground) to a new     receptacle.

     

     So the questions are:

     

     -What method should I use to electrically connect the 4 wires at the     side wall box to the new wires that are being run through the     conduit to the new pedestal mounted receptacle?

     

     -The travel trailer that will occupy my new trailer park is a 30 Amp     unit so I presume I should run the four 50 Amp wires through the new     underground conduit to the new new pedestal mounted receptacle so as     to take advantage of the additional conductor?

     

     -Regarding the new receptacle should I go with a 50 Amp or a 30 Amp?

          -If I install a 50 Amp receptacle to the new pedestal then I     could plug in the trailer using a 50 Amp to 30 Amp adapter     plug...or...

          -Should I install a 30 Amp plug at the new receptacle so as to     limit the current draw considering the the additional 30 feet of     wire resistance?

               -If I went with a 30 Amp receptacle, then how would I     connect the 4 wires to the 3 wire 30 Amp plug?

     

     -What is an economical conduit for the underground run that is     appropriate for the exposed sections (down hangar wall and up     pedestal)?

          -How deep does conduit need to be buried?

          -What diameter conduit should I use? 

     

     -Where is a good source to procure the plastic pink flamingos, tiki     torches, and rolled out fake grass required to amplify the tackiness     of my new trailer park?

     

     Sorry for the slightly off topic question however you all are the     smartest people I know on any subject so I'm sure there is someone     on this list who used to do this work and could provide some "if it     were me I would..." statements.

     

     Thanks for your patience and offline responses are good so as to     avoid spamming of my off topic post!!!

     

     Bill

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Rowland_Carson

Joined: 04 Jul 2008
Posts: 155
Location: Cheltenham, England

Posted: Sat May 14, 2022 11:40 am Post subject: Hangar Electrical Work

On 2022-05-14, at 20:19, William Hunter <billhuntersemail(at)gmail.com> wrote:



 	  Quote: 	
		   So this question is about a hangar at an airport albeit a slight off topic question for the multi-knowledgeable among us... 

 

 I have a 50 amp RV receptacle box mounted to the outer side wall of my steel hangar and it is fed by the four red/green/white/black wires that are routed from the inside of the building through metal conduit that is inserted through the side wall out to the steel box where the receptacle is installed as per code.

 

 I want to decommission that receptacle


	




Bill - it might help to focus the replies if you could mention what country you live in  . . . . . electrical practice does vary quite a bit between different jurisdictions.



in friendship



Rowland



| Rowland Carson          ... that's Rowland with a 'w' ...

| <rowlandcarson(at)gmail.com>            http://www.rowlandcarson.org.uk

| Skype, Twitter: rowland_carson      Facebook: Rowland Carson

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user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Mon May 16, 2022 4:14 pm Post subject: Re: Hangar Electrical Work

Use the same size new wire as the existing wire.

The trailer electrical load determines the amount of current, not the receptacle size.

Use a 30 amp receptacle.

Use gray plastic conduit or use rigid metal conduit if there is a damage risk.

Buy conduit one size bigger than you think that you need.

Use a shop vac to suck a pull string through the conduit.

Bury the conduit 2 feet deep or more.

Use the green/white/black wires, but not the red one.

Search Google for "how to wire 30 amp RV plug"

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Joe Gores

Ceengland

Joined: 11 Oct 2020
Posts: 391
Location: MS

Posted: Mon May 16, 2022 5:20 pm Post subject: Hangar Electrical Work

On 5/14/2022 2:19 PM, William Hunter wrote:

 	  Quote: 	
		   Hi All.



 So this question is about a hangar at an airport albeit a slight off 

 topic question for the multi-knowledgeable among us...



 I have a 50 amp RV receptacle box mounted to the outer side wall of my 

 steel hangar and it is fed by the four red/green/white/black wires 

 that are routed from the inside of the building through metal conduit 

 that is inserted through the side wall out to the steel box where the 

 receptacle is installed as per code.



 I want to decommission that receptacle so I can extend the wires 

 outside underground to a newly installed pedestal about 20 feet 

 away...in other words I need to open the existing metal box, eliminate 

 the receptacle and put a cover over the opening, run a conduit from 

 the bottom of the existing box down the outside hangar wall and into 

 the ground and then run it under ground out horizontal 20 feet, and 

 then up the side of a newly installed "pedestal" (4X4 pressure treated 

 post sticking out of the ground) to a new receptacle.



 So the questions are:



 -What method should I use to electrically connect the 4 wires at the 

 side wall box to the new wires that are being run through the conduit 

 to the new pedestal mounted receptacle?



 -The travel trailer that will occupy my new trailer park is a 30 Amp 

 unit so I presume I should run the four 50 Amp wires through the new 

 underground conduit to the new new pedestal mounted receptacle so as 

 to take advantage of the additional conductor?



 -Regarding the new receptacle should I go with a 50 Amp or a 30 Amp?

      -If I install a 50 Amp receptacle to the new pedestal then I 

 could plug in the trailer using a 50 Amp to 30 Amp adapter plug...or...

      -Should I install a 30 Amp plug at the new receptacle so as to 

 limit the current draw considering the the additional 30 feet of wire 

 resistance?

           -If I went with a 30 Amp receptacle, then how would I 

 connect the 4 wires to the 3 wire 30 Amp plug?



 -What is an economical conduit for the underground run that is 

 appropriate for the exposed sections (down hangar wall and up pedestal)?

      -How deep does conduit need to be buried?

      -What diameter conduit should I use?



 -Where is a good source to procure the plastic pink flamingos, tiki 

 torches, and rolled out fake grass required to amplify the tackiness 

 of my new trailer park?



 Sorry for the slightly off topic question however you all are the 

 smartest people I know on any subject so I'm sure there is someone on 

 this list who used to do this work and could provide some "if it were 

 me I would..." statements.



 Thanks for your patience and offline responses are good so as to avoid 

 spamming of my off topic post!!!



 Bill

Is this under a grass area, with little to no vehicle traffic? If so, 
	


direct burial cable will get the job done. I've had a run buried from my 

house to hangar for over 20 years, with frequent tractor traffic 

(mowing) & occasional cars & trucks on it. Depth is a 'code' thing; if 

your location isn't subject to heavy traffic or code inspectors, but 

anything over 15-20 inches would protect the wire, but it might be more 

vulnerable to later digging. Schedule 40 PVC down the wall and into the 

ground, then just bury the cable to the post, and sched40 up the post to 

the box. If it's driven on constantly, then I'd use the PVC all the way 

and run individual conductors in the pipe. Steel isn't that much tougher 

than sched40 PVC for a burial application, and it *will* rust away 

eventually. The power company here always uses PVC when going under 

gravel driveways, and direct burial cable elsewhere (with PVC pipe 

protection above ground).



In the US, 4 wire is now the 'standard' for 220VAC; typically hot black, 

hot red, neutral white, ground green or bare. If you have to deal with 

inspectors, 4 wires & a 4 hole outlet might save you some grief. Also 

give future flexibility; the next RV might be bigger.



I'm not an electrician, but I've done quite a bit of electrical work (my 

dad was a licensed electrician), and the above is what I've done for my 

own applications.



FWIW,



Charlie



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Charlie

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