On May 8, 9:59 am, wrote:
"Even with a multi-port protector (D) for TV1, the ground voltage at D
is conveyed to TV2 by the coaxial cable, resulting in an 8,000 V
potential across TV2, which will probably destroy it. A second multi-
port protector as shown in Fig. 7 is required to protect TV2."

TV is 8000 volts damaged because a surge current was permitted
inside the building. That surge current had to find earth ground.
With or without the power strip, it will find earth ground
destructively through some appliance.

We install and earth on 'whole house' protector so that no surge
current enters the building. One properly earthed (ie less than 10
foot) 'whole house' protector means the surge finds and is harmlessly
dissipated in earth. Does not enter the building. Does not get
earthed by the power strip protector 8000 volts through any appliance.

Why do telcos all over the world not use that power strip
protector? They need protectors that make that short connection to
earth – that actually provide protection. They need nothing damaged.
Apparently trader considers appliance damage acceptable.

Same solution is available for all homes. One 'whole house'
protector sells in Lowes for less than $50. That means one protector
for maybe 100 items. But you would have them spend $5000 on power
strips for everything including the furnace, smoke detectors, and
bathroom GFCIs? Which scam are you promoting? An earthed surge does
not overwhelm protection that already exists inside every appliance.