Somewhat safe, however, ice loading, cable bundle weight, overall height of pole, height at lowest communications attachment and type of crossing beneath the lowest sag of the span are all critical factors.
You can have a pole with 4 single coax runs across it and not have a problem with loading but run in to issues with clearance... At the same time, a single cable attachment mounted high on the pole would be fine except for issues with ice loading and cable weight... Just requires a lot of footwork to make sure it's doable. On Thu, Sep 10, 2009 at 12:18 PM, Sales <[email protected]> wrote: > How safe would the follow assumption be when counting existing cables > in the communications space on poles? > > 4 just forget it > 3 might be able to > 2 pretty good chance > 1 great chance > > :) ? > > John Buwa > Michiana Wireless,Inc > 574-233-7170 > Sent from my iPhone > > On Sep 9, 2009, at 8:51 PM, AJ <[email protected]> wrote: > > > The work we do with Idaho Power here requires us to be 30" below the > > lowest > > conductor (grounded neutral in our case) from power and 40" from the > > lowest > > primary distribution. However, if triplex is coming off the pole > > (secondary > > single phase 120/240v from transformer to house, basically the power > > drop), > > we have to be 40" below the attachment point of the secondary and > > 30" apart > > at the lowest sag point mid-span. > > > > The 40" applies to basically primary below 13kv... Above 13kv, i.e. > > 14.4kv > > or 24.94 kv, we have to be at least 43" below the lowest primary > > conductor > > or any part of the insulator of the conductor at a cross arm. > > > > As far as attachment at the pole, we're required to maintain 12" > > between the > > centers of the attachment bolts between CATV, Phone and any other > > communications provider, i.e. point to point fiber, alarm, > > government fiber, > > etc. Any amplifier or other device on the line, including drip loops > > on > > hardline coax, have to maintain 6" clearance from any other > > communications > > cable. > > > > With that being said, for new attachments with ice loading, we have to > > maintain the lowest possible sag of 15' 6" which leaves us at > > between 17' > > and 19' AGL at the attachment. Combine this is a transformer and > > residential > > triplex drop leaves you with three, sometimes less, eligible > > communications > > attachments on the majority of the shorter 45' and 55' poles. > > > > In some of our more crowded corridors, we've gone to cross arms > > where we can > > load up 4 to 6 utilities horizontally rather than vertically, > > however, this > > is usually to compensate for sag at mid span or too short of a pole > > for 6 > > attachments to begin with. > > > > You're looking for NESC Joint Use with is between sections 230 and > > 238 I > > believe... > > > > > > On Wed, Sep 9, 2009 at 5:06 PM, Sales <[email protected]> > > wrote: > > > >> > >> Does anyone know exactly what the nesc codes for fiber on poles are? > >> We have a run that we want to do and the poles are kinda crowded. The > >> electric company told us the phone company has to stay on bottom and > >> there has to be certain gaps. If they have to move people up to make > >> room they may need to replace poles at our cost. He said we can be > >> the > >> judge for free if we follow nesc codes and estimate if we can find a > >> gap anywhere. So what exactly are we looking for ? > >> > >> > >> > >> --- > >> --- > >> --- > >> --- > >> -------------------------------------------------------------------- > >> WISPA Wants You! Join today! > >> http://signup.wispa.org/ > >> > >> --- > >> --- > >> --- > >> --- > >> -------------------------------------------------------------------- > >> > >> WISPA Wireless List: [email protected] > >> > >> Subscribe/Unsubscribe: > >> http://lists.wispa.org/mailman/listinfo/wireless > >> > >> Archives: http://lists.wispa.org/pipermail/wireless/ > >> > > > > > > --- > > --- > > --- > > --- > > -------------------------------------------------------------------- > > WISPA Wants You! Join today! > > http://signup.wispa.org/ > > --- > > --- > > --- > > --- > > -------------------------------------------------------------------- > > > > WISPA Wireless List: [email protected] > > > > Subscribe/Unsubscribe: > > http://lists.wispa.org/mailman/listinfo/wireless > > > > Archives: http://lists.wispa.org/pipermail/wireless/ > > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > > -------------------------------------------------------------------------------- > > WISPA Wireless List: [email protected] > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: [email protected] Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
