On Tuesday, October 20, 2015 at 8:40:25 PM UTC-4, westom wrote:
On Tuesday, October 20, 2015 at 4:55:00 PM UTC-4, trader_4 wrote:
Really? There is an earth ground on the line cards? In days gone by
you denied there was any protection on the line cards period.

I did not say that. You are again inventing fiction to only be nasty. Trader_4 has never worked in any facility that cannot have damage. He had absolutely no reason to believe a line card has an earth ground. I never said that. He is here only to be nasty and demaning. As he usually is.

I said that because your mantra is that there can be no surge protection
without a direct, short connection to earth ground. You claim that's
why plug-in surge protectors are useless. Still not answered, if plug-ins
can't work because they have no earth ground, how can the surge protection
in every appliance work? How can the protection on line-cards at a Telco
work? Note: At least now you don't deny that line-cards have surge
protection on them. In the past, you claimed they didn't.




Facilities that cannot have damage always implement the 'whole house' solution. As in always. Even 'point of connection' protectors (ie in HVAC equipment) need that protection. IEEE defines how effective a properly earthed 'whole house' solution is with numbers, "99.5% to 99.9% protection".

Once a major and destructive surge is earthed, then that adjacent (point of connection) protector might pick up some residuals. It might add another 0.2% protection. But if a 'whole house' protector is not properly earthed, then Dr Martzloff defines the problem in a conclusion of his 1994 IEEE paper:


Here is what Martzloff says about the actual issue of interest in a
guide to surge protection he wrote:

"Plug-in Surge Protectors

This is the easiest solution and there are a wide variety of brands
in the stores. These come in two forms: a box that plugs directly
into a wall receptacle or a strip with a power cord and multiple outlets."

http://pml.nist.gov/spd-anthology/fi...es_happen!.pdf

That's from the National Institute of Technology and Standards,
Martzloff wrote it. Note that he doesn't say they can't work because
they have no earth ground, that they are worthless, or that they
actually cause damage. He says they are the easiest solution.




Conclusion:

The conclusion is that if you read what Martzloff wrote, he obviously
disagress with you too.

BTW a grounded airplanes must be earthed to avert damaged. Every airplane is electrically connected to an earthing network inside the tarmac. Airplanes in the air are not damaged. Lightning is not hunting for earth destructively inside a plane that is not on earth. Trader_4 was told that repeatedly. He is simply reposting his lie hoping you are dumb enough to believe him. He is not here to be helpful or informative. So he again posts his airplane myth to keep you confused and ignorant.


No, I posted it because you claim no protection is possible, without a
direct connection to earth ground. Yet, airplanes have surge protection
and they do it partly by doing the same thing plug-in protectors do,
which is by clamping voltages. As to who is dumb, viewers can read the
references I've cited, read Marzloff in his own words and decide for
themselves.