DirecTV grounding

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hockeyoligist2

hockeyoligist2

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close to greenville sc
I know that I have read something on this before, I searched but didn't come up with an answer.

A friend asked me to look at his DirecTV installation, I'm industrial so not up to date on this stuff. He has a double-wide and had a lightning hit that took out most of his electronics. The new dish was installed recently, after he upgraded to HD. DirecTV installed it.

The dish is on a steel pole, set in concrete. It has a ground bonded to the frame of the DW. I can't tell if the frame is bonded to the homes ground system, but I would think it should be, since it was built in 2006? Does it need additional grounding? The service is on the other end of the house so I'm thinking drive a new rod or two next to the dish.

It appears to have entered through the DTV dish, just a guess. I am assuming this because the filter on the coax from the dish was blown apart. He had good quality surge protectors but the coax and telephone wasn't routed through them.

It took out the DirecTV receiver, the HDMI part of his TV, his Roku player, router, DVD recorder, and PC, which were all linked indirectly by cables through the HDMI on the TV. It didn't take out his DSL modem, so I'm thinking the router failed before it got that far.
 
hockeyoligist2 said:
I know that I have read something on this before, I searched but didn't come up with an answer.

A friend asked me to look at his DirecTV installation, I'm industrial so not up to date on this stuff. He has a double-wide and had a lightning hit that took out most of his electronics. The new dish was installed recently, after he upgraded to HD. DirecTV installed it.

The dish is on a steel pole, set in concrete. It has a ground bonded to the frame of the DW. I can't tell if the frame is bonded to the homes ground system, but I would think it should be, since it was built in 2006? Does it need additional grounding? The service is on the other end of the house so I'm thinking drive a new rod or two next to the dish.

It appears to have entered through the DTV dish, just a guess. I am assuming this because the filter on the coax from the dish was blown apart. He had good quality surge protectors but the coax and telephone wasn't routed through them.

It took out the DirecTV receiver, the HDMI part of his TV, his Roku player, router, DVD recorder, and PC, which were all linked indirectly by cables through the HDMI on the TV. It didn't take out his DSL modem, so I'm thinking the router failed before it got that far.
Click to expand...

810.21(F)
The ground needs to be run to the Intersystem Bonding Termination if there is one
 
hockeyoligist2 said:
"Intersystem Bonding Termination"

Lost me there!
Click to expand...

article 100:)
Intersystem Bonding Termination. A device that provides
a means for connecting communications system(s)
grounding conductor(s) and bonding conductor(s) at the
service equipment or at the disconnecting means for buildings
or structures supplied by a feeder or branch circuit.
 
It may have been installed long enough ago that there is no intersystem bonding terminals (only installs done under 2011 code will have those). Key things are:

Do you have a ground block for the coax entering the house?
Are ALL your grounds run to a common point (building ground, dish pole, coax ground block, telephone NID, ...)

If you have separate electrodes for some of the above, they all need to be intertied with a #6 copper bonding jumper.
 
Time goes so fast anymore that it just seemed like last year.... But even the 2008 probably wasn't adopted right away in most areas, and only these new systems are going to have those provisions.
 
The intersystem bond is a very important requirement. The concept is to create a single point ground, an intersystem bond is not required to do this, but it was added to make it easier to do. If all the communications systems are bonded together, in a lighting event, there is no difference of potential, and no damage. Heres the concept: a difference of potential from a lighting strike between the antenna and TV, means voltage. There is some resistance, and with that ohms law gives us current, zip zap right thru your TV tuner.
The rules for bonding antennas and coax are in Art 810 and 820.

Its also important to have an SPD for power and coax.
 
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