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#28695 - 08/28/03 01:34 PM Recommended hole depth for high poles???  
sparkync  Offline
Member
Joined: Oct 2002
Posts: 817
NC
Does anyone know the recommended hole depth for different size poles? I believe the recommended depth for a 30 ft. pole is 5 ft. in the ground, but other sizes I'm not sure. Thanks for the input... Steve


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#28696 - 08/28/03 02:30 PM Re: Recommended hole depth for high poles???  
George  Offline
Member
Joined: Feb 2002
Posts: 375
That depends on the soil conditions and how much tension in on the wires.

Your local Power Company probably knows best.


#28697 - 08/28/03 10:31 PM Re: Recommended hole depth for high poles???  
targetshootr  Offline
Member
Joined: May 2003
Posts: 55
nc
when i last looked at my duke power notes from several years ago, they required any temporary power pole (saw service) to be 4 ft in the ground. that was when i bought a post-hole digger. for a 30 ft pole i'd call 'em to be sure.


#28698 - 08/28/03 11:23 PM Re: Recommended hole depth for high poles???  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Lineman’s Handbook - §11

25 ft pole 5.0 ft in soil / 3.5 ft in rock
30 ft pole 5.5 ft in soil / 3.5 ft in rock
35 ft pole 6.0 ft in soil / 4.0 ft in rock
40 ft pole 6.0 ft in soil / 4.0 ft in rock
45 ft pole 6.5 ft in soil / 4.5 ft in rock
50 ft pole 7.0 ft in soil / 4.5 ft in rock
55 ft pole 7.5 ft in soil / 5.0 ft in rock
60 ft pole 8.0 ft in soil / 5.0 ft in rock




[This message has been edited by Bjarney (edited 08-28-2003).]


#28699 - 08/29/03 09:59 PM Re: Recommended hole depth for high poles???  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,211
SI,New Zealand
Bjarney,
Are poles in the US set into concrete(cement) at the base of the pole?.
What is more common wood or concrete poles?
What sort of wood is used (where wood is used), to fabricate poles and cross-arms in the US?. [Linked Image]

[This message has been edited by Trumpy (edited 08-29-2003).]


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#28700 - 08/29/03 11:17 PM Re: Recommended hole depth for high poles???  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Not seen concrete used with wood poles for distribution circuits, which are just about universal [at least in the western US] and planted in tamped soil. Concrete might be used in rock. Transmission and subtransmission <20 years are tubular steel—a good part of them are pre-rusted “Corten” finish—and also “ANSI 71 Sky Grey.” A lot of lattice towers still in service 69-525kV. Concrete bases for tangent towers, but some directly buried tubulat steel where strain is limited.

One common wood for poles is pressure-treated Western Red Cedar, and pressure-treated Douglas Fir for crossarms—although wood crossarms are out of vogue. Fiberglass rod is used for some insulator supports—some galvanized steel—and a lot of circuits are fairly-tight triangular construction—vertical in others. Utilities [and regions within large utilities] seem to all have variations.


#28701 - 08/30/03 09:02 PM Re: Recommended hole depth for high poles???  
CallOutKing  Offline
Junior Member
Joined: Aug 2003
Posts: 1
los angeles , Ca USA
The general rule of thumb is...10% of the height of the pole..plus 2 feet.

That is our companies general requirements..but of course soil conditions might dictate something else.



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