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#79199 12/03/01 03:49 PM
Joined: Dec 2001
Posts: 4
Junior Member
Do underground service entrance conductors installed by directional boring method rather than trenching require a warning ribbon?

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#79200 12/03/01 04:06 PM
Joined: Nov 2000
Posts: 2,148
Yes. There were proposals made to provide such an exemption, but they were rejected. The chances of damage from future excavation do not change just because you used a closed rather than open excavation method for the installation. If you want to bore you will have to do it twice, one for the cable and one for the ribbon.

#79201 12/04/01 08:12 PM
Joined: Nov 2000
Posts: 2,148
As the result of a follow up question to me from Scott on this subject via e-mail I did some additional research. My original post is not entirely correct.
A proposal was submitted to the NFPA for a change in 300-5(d) for the 2002 code. This was proposal 3-43. The proposal asked that the following wording be added to 300-5(d): "Horizontally bored service laterals shall be exempt from this requirement." Code Making Panel 3 rejected the proposal with the statement that; "Present language only addresses trenching, not boring, thus boring is already excluded from the ribbon requirement".
This indicates to me that the panel did not intend to require a ribbon above cables that were installed by boring. It aprears to me, that based on the panel comment, if you are operating under the 99 code, a ribbon would not be required for conductors installed by boring. Also note the new wording applies to all underground service conductors, not just service laterals as in the 99 code.

[This message has been edited by resqcapt19 (edited 12-05-2001).]

#79202 12/06/01 08:14 PM
Joined: Aug 2001
Posts: 599
The chances of damage from future excavation do not change just because you used a closed rather than open excavation method for the installation.
I agree with this statement more than the panels findings.

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