interresting surge protection view
27 Sep 2024 05:37 #310878
by PhilipME
interresting surge protection view was created by PhilipME
below text copied from
www.plctalk.net/threads/surge-protection...ng%20are%20at%20risk.
First, eliminate the idea that any protector does protection. Did you really think a protector would somehow block or absorb a destructive surges? Anything that might do that must already be inside electronics.
Second, a destructive surge does damage if that PLC is the best connection to earth. If a surge can blow through a PLC, then it easily blows through 'blocking' or 'energy absorbing' protectors. But if connected low impedance to single point ground, then nobody even knows a surge existed. That energy dissipates harmlessly in earth.
In most facilities, single point ground means wires inside every incoming cable connect low impedance (ie 'less than 10 foot') to the single point ground. All wires enter at the common (service entrance) location. All connect low impedance to one ground. Make that connection either directly or via a protector.
www.plctalk.net/threads/surge-protection...ng%20are%20at%20risk.
First, eliminate the idea that any protector does protection. Did you really think a protector would somehow block or absorb a destructive surges? Anything that might do that must already be inside electronics.
Second, a destructive surge does damage if that PLC is the best connection to earth. If a surge can blow through a PLC, then it easily blows through 'blocking' or 'energy absorbing' protectors. But if connected low impedance to single point ground, then nobody even knows a surge existed. That energy dissipates harmlessly in earth.
In most facilities, single point ground means wires inside every incoming cable connect low impedance (ie 'less than 10 foot') to the single point ground. All wires enter at the common (service entrance) location. All connect low impedance to one ground. Make that connection either directly or via a protector.
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10 Oct 2024 22:14 #311777
by tommylight
Replied by tommylight on topic interresting surge protection view
It does not say what kind/type of surge
1-from the grid due to something disconnecting elsewhere and voltage going above tolerance
2-from lightning strikes and the resulting induced surge on the grid wiring
First is quite easy to protect from although absolutely not 100% safe, using fuses and varistors on the power input, fixed a fair share of those, i would say 95% fix rate so far.
Second is a cr@p shoot as it is unpredictable and varies a lot on how much energy got dumped, had from easy fixable to utterly destroyed.
As a side note, lightning strikes usually cause damage to whatever has long cables, and it is proportional, so longer cables = more chances of something letting out the magic smoke. Cabled camera surveillance systems and ISP routers suffer from this often.
1-from the grid due to something disconnecting elsewhere and voltage going above tolerance
2-from lightning strikes and the resulting induced surge on the grid wiring
First is quite easy to protect from although absolutely not 100% safe, using fuses and varistors on the power input, fixed a fair share of those, i would say 95% fix rate so far.
Second is a cr@p shoot as it is unpredictable and varies a lot on how much energy got dumped, had from easy fixable to utterly destroyed.
As a side note, lightning strikes usually cause damage to whatever has long cables, and it is proportional, so longer cables = more chances of something letting out the magic smoke. Cabled camera surveillance systems and ISP routers suffer from this often.
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