Now your contradicting yourself. Before you stated that the phone line is already protected via code, and now below you list it as a serious threat. Which one is it, are we protected or not via the phone line?
Both posts are complementary. If you see a contradiction, then you still did not grasp fundamental concepts posted earlier.
Either energy dissipates outside the building. Or that energy hunts for earth destructively via appliances. All phone lines and cable (North America - may not be required by S Korean codes) have an earthed 'whole house' protector. If you let energy inside, appliances most often damaged are those best connected to earth ground.
Phone line and cable TV earthing means surges are not incoming on those wires. Repeatedly stated, if any wire is not earthed before entering the building, than all protection is compromised. If you let energy inside a building, then effective protection on telephone and cable TV is completely compromised.
Protection means no energy inside the building. Best protectors on telephone and cable TV is the short connection to single point ground. Surges earthed before entering a building. Only way to find contradiction is to not understand what is always required. Every incoming wire earthed. Either energy dissipates harmlessly outside the building. Or energy hunting for earth destructively via appliances. If energy is inside a building, then nothing will stop that hunt. Best protection in the world on phone lines is also a destructive path to earth if you did not properly earth ‘every’ incoming wire to single point earth ground.
Code says nothing about surge protection. Code only defines human safety. To have transistor safety, you must meet code and exceed code. Essential to transistor safety includes something not required by code – a less than 3 meter connection to single point earth ground.
Surges are not just lightning. Surges large enough to harm appliances typically occur about once every seven years. A number that can vary significantly even in the same town. Even geology affects that number. A decade of local history would better define the threat. If you do not need a 'whole house' protector, then you need no protectors. IOW a $3 or $5 power strip with many plugs and the ‘always required’ circuit breaker is a superior solution.
