Re: Conduit Spacing in pull boxes
Open bottom handholes are not a wiring method that is recognized by the NEC. The CMP has accepted a proposal to add them to the scope of article 314.
However they are commonly used for pull boxes, typically for traffic signals. In Washington State, our DOT has specific requirements on the maximum number of conduits allowed, spacing and installation.
Our state electrical code has additional requirements on the legend and installation.
You also have to consider the traffic rating of the box. Most boxes are not listed, but are appoved by the DOT in their specs.
Sorry thats not the quick answer you wanted, but a call to your local signal shop will probably get you a fast answer.
[ October 30, 2003, 02:17 PM: Message edited by: tom baker ]