http://www.dslreports.com/forum/Re-Grounding-question-21578407 en Fri, 10 Feb 2012 15:03:39 EDT Fri, 10 Feb 2012 15:03:39 EDT http://www.dslreports.com/forum/Re-Grounding-question-22160390
Second, you don't say how you are measuring the voltage, beteen what and what? I have found it more productive to measure current instead of voltage using an Amp Probe type meter that clamps around the cable. You can have voltage with practicaly no current that means nothing.

Mallego]]> http://www.dslreports.com/forum/Re-Grounding-question-22160390 Tue, 31 Mar 2009 18:58:59 EDT http://www.dslreports.com/forum/Re-Grounding-question-22089181 http://www.dslreports.com/forum/Re-Grounding-question-22089181 Wed, 18 Mar 2009 12:53:28 EDT http://www.dslreports.com/forum/Re-Grounding-question-22088130 http://www.dslreports.com/forum/Re-Grounding-question-22088130 Wed, 18 Mar 2009 09:39:24 EDT http://www.dslreports.com/forum/Re-Grounding-question-22061333
i work for the cox cable system here in palos verdes california, i think whats going on with that house that has
2 service drops and back feeding voltage into the system...the house electrical wiring isnt grounded properly or if at all.....if they have a box or more than 1...voltage from the power outlet will pass through the box and back out into the system....and if ur on the same tap...yes you will see issues in ur house..even if ur house cable wiring is grounded properly, voltage over a certain degree will pass through the ground.]]> http://www.dslreports.com/forum/Re-Grounding-question-22061333 Fri, 13 Mar 2009 00:24:34 EDT http://www.dslreports.com/forum/Re-Grounding-question-21592636
Also might want to check for ingress on each outlet, if you find one with ingress, you may have also found the source of the voltage as well, intermittent generally means sub has old POS EQ that is only charging it when they turn it on, IR old junk VCR, or ancient TV. Maybe have then turn on ALL EQ when you do the voltage check but be careful.]]> http://www.dslreports.com/forum/Re-Grounding-question-21592636 Tue, 16 Dec 2008 18:17:04 EDT http://www.dslreports.com/forum/Re-Grounding-question-21580712
Now there is AC back feeding on 4 different lines in the home back to the NIU, which I believe with the conditions of the ground when connected is charging up the lines and creating a load which eventually melts the cable.

From what I am seeing is 2 problems. A ground issue as well as a AC back feed issue. As I was out again today. I verified the incoming drops had no AC and tested the ground before we bonded to the orginal house ground and did read voltage on the house ground again. The highest I have seen the house ground has been 37 volts. Which obviously should be reading zero... just frustrated with this partuclar issue.]]> http://www.dslreports.com/forum/Re-Grounding-question-21580712 Sun, 14 Dec 2008 15:35:16 EDT http://www.dslreports.com/forum/Re-Grounding-question-21579191
The DC resistance and AC impedance of the grounding system (ground vertical(s), connection points, grounding rod(s), and ground
resistance) is also of major concern in cable systems for proper dissipation of voltage transients with resulting overcurrent
conditions.
The DC resistance of the grounding system relates to the systems ability to properly dissipate overcurrent conditions caused by
longitudinal sheath currents, and elimination of potential differences between grounding or neutral conductors in the utility plant,
poles or pedestals [non-transient conditions]. The condition of connectors used at strand and ground electrodes, and attaining and
maintaining a good ground are the primary determinants in success.
The AC impedance of the system, which exists under voltage transient conditions, is determined by the following:
• The inductance of the ground wire (vertical), it does not change significantly with wire size.
• The length of the vertical run [determines overall inductance].
• How the vertical system is positioned; proper placement involves vertical and horizontal runs only with smooth bends. An
esthetically pleasing system (looks good to the eye) many times employs poor practices in attaining low AC impedances.
• Using more than one grounding conductor and electrode, which places two grounding electrode systems in parallel and
therefore halves the impedance of the system.
Summarizing, size of the ground conductor is not as important (NESC requires #8 at minimum) as is the overall length. The length
should be kept to an absolute minimum given site conditions. This applies for both utility pole and service line (drop)
bonding/grounding.
Investigation into longitudinal sheath current phenomena in CATV systems also indicates the following:
• The overall importance of frequent and quality (low impedance/resistance) grounds [not bonds].
• Proper location of bonds between CATV plant and power company verticals. Improperly placed or too many bonds may in
fact increase the percentage of load imbalance current carried, the major contributor to long term longitudinal sheath current
conditions in CATV systems.
In the final analysis, grounding and bonding issues can and should be treated separately - to assist in simplifying the myriad of
issues involved. Bonding serves the primary purpose of meeting NESC code requirements, which in general has personnel safety
as the main emphasis. Cable bonding procedures should be designed to meet NESC requirements only. Grounding serves to
properly dissipate voltage transients in the CATV plant; through draining of the transient to ground, and enabling proper operation of
transient shunting devices such as crowbar circuits which should be the main methodology in transient protection for the cable
system.
--
A government large enough to provide you with everything, is also large enough to take everything away.]]> http://www.dslreports.com/forum/Re-Grounding-question-21579191 Sun, 14 Dec 2008 05:19:07 EDT http://www.dslreports.com/forum/Re-Grounding-question-21579177 http://www.dslreports.com/forum/Re-Grounding-question-21579177 Sun, 14 Dec 2008 05:01:34 EDT http://www.dslreports.com/forum/Re-Grounding-question-21579117 --
A government large enough to provide you with everything, is also large enough to take everything away.]]> http://www.dslreports.com/forum/Re-Grounding-question-21579117 Sun, 14 Dec 2008 03:55:52 EDT http://www.dslreports.com/forum/Grounding-question-21578407
Now the house with the 2 drops keep havng cable issues as melted cable and intermitent signal because of all the voltage floating around. Now out of the 8 service drop this is the only house with that issue. you would think if this was coming from the pole it would happen to the other customers correct?]]> http://www.dslreports.com/forum/Grounding-question-21578407 Sat, 13 Dec 2008 22:58:26 EDT