ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#28695 - 08/28/03 10:34 AM Recommended hole depth for high poles???
sparkync Offline
Member
Registered: 10/17/02
Posts: 809
Loc: 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
Top
Work Gear for Electricians and the Trades
#28696 - 08/28/03 11:30 AM Re: Recommended hole depth for high poles???
George Offline
Member
Registered: 02/23/02
Posts: 375
That depends on the soil conditions and how much tension in on the wires.

Your local Power Company probably knows best.
Top
#28697 - 08/28/03 07:31 PM Re: Recommended hole depth for high poles???
targetshootr Offline
Member
Registered: 05/02/03
Posts: 55
Loc: 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.
Top
#28698 - 08/28/03 08:23 PM Re: Recommended hole depth for high poles???
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2527
Loc: 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).]
Top
#28699 - 08/29/03 06:59 PM Re: Recommended hole depth for high poles???
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8211
Loc: 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?.

[This message has been edited by Trumpy (edited 08-29-2003).]
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin
Top
#28700 - 08/29/03 08:17 PM Re: Recommended hole depth for high poles???
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2527
Loc: 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.
Top
#28701 - 08/30/03 06:02 PM Re: Recommended hole depth for high poles???
CallOutKing Offline
Junior Member
Registered: 08/28/03
Posts: 1
Loc: 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.
Top

Member Spotlight
Member Since: 04/03/02
Posts: 6775
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 85 Guests and 8 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 51
HotLine1 43
gfretwell 17
Trumpy 16
Ruben Rocha 13
 
Newest Members
clee512, Jdscott2005, FAIZAN, Regitest2, sureshazhagai

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals