Handhole
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Posted Monday, February 02, 2009 4:07 AM
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Hi,

what is the distance between a handhole to handhole?

JOJU P RAJ-RCDD

joj.nemo@gmail.com

Post #2618
Posted Monday, February 02, 2009 8:25 AM


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This is from TIA-758

4.2.2.2 Location

When determining handhole locations, considerations should include ground topography, soil

conditions, location of the hole relative to surrounding structures, personnel access, and the difficulty

in using the handhole for placing cable. Handholes may be placed when the bends exceed either two

90-degree bends or a total of 180-degrees; or the section length of conduit requires a pull point for

ease of cable installation.

Conduit entering the handhole should be aligned on opposite walls of the hole at the same elevation.

4.2.2.3 Sizing

A handhole shall not exceed 1.2 m (4 ft) in length by 1.2 m (4 ft) in width by 1.2 m (4 ft) depth and

should not be used in runs of more than three 103 (4) trade size conduits.

Post #2619
Posted Monday, February 02, 2009 4:22 PM


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In addition to the standard you should consider the gradual grade changes.  Conduits will normally be placed with respect to the surface.  Many times this surface will move up and down several times between handholes.  The changes will cause the cable to change the area of contact within the conduit.  All though not considered an elbow the sum of the total bends can be equal to a 90 degree right angle.  This will cause the pulling tension to become greater than recommended even though you haven't added any elbow's.

Dave

Post #2633
Posted Tuesday, February 03, 2009 4:24 AM
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Thank for the reply. But i would like to know the distance between a handhole to handhole. I have seen that some are saying 90 meter. but if this as same standard of pull box, then it should be in 30.5 meter right? please clarify this point.

JOJU P RAJ-RCDD

joj.nemo@gmail.com

Post #2642
Posted Tuesday, February 03, 2009 10:09 AM


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I could not find a reference to Hand Holes in the standard.

A spec from the University of California uses the 600 ft as

described in TIA-758 between Maintenance Holes. They treat

MH/HH the same.

12) The maximum distance allowed between buildings and MH/HH’s and between MH/HH’s is 600 feet. The installation of plastic or fabric type innerduct within the conduit should be considered in locations that exceed this distance limitation.

Post #2647
Posted Wednesday, February 04, 2009 8:42 AM


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JOJU_BICSI (2/3/2009)
Thank for the reply. But i would like to know the distance between a handhole to handhole. I have seen that some are saying 90 meter. but if this as same standard of pull box, then it should be in 30.5 meter right? please clarify this point.

Hello,

There is a section in the OSP manual (Chapter 5, of the 4th edition) that details how to calculate pulling tension through conduit systems. The manufacturer provides cable strength information, and then you need to calculate the length of the section you can pull through, without exceeding that limit.

Also, in that same section, there is a statement, "The length of the conduit will vary up to a maximum of 183 meters." It then lists a number of mitigating factors, including "intermediate MHs due to excessive cable pulling tension caused by bends." 

Hope that helps.

Doug

Doug Weis, RCDD, ESS

doug.weis@hei-eng.com

Post #2653
Posted Wednesday, February 04, 2009 10:40 AM
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Thank you for the reply.

JOJU P RAJ-RCDD

joj.nemo@gmail.com

Post #2655
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