Joe,
300.5(D)(3) does not require the use of "warning ribbons" when the installation is made without a trench. I don't have my ROPs and ROCs here at work, but there was a panel comment in the '99 or '02 code cycle that said the warning ribbon rule does not apply to directional boring installations. In my opinion the hazard does not change just because a different installation method was used. Also the rule only applies to service conductors.
Don
[This message has been edited by resqcapt19 (edited 01-30-2003).]
