Because appliances already have internal protection that makes most
transients irrelevant, then we earth a surge protector only for
something that occurs typically once every seven years. Properly
installed protection means a direct lightning strike results in no
electronics damage. A direct lightning strike to utility wires down
the street may be a direct lightning strike to household appliances.
And that event should cause no damage.

Any protector that will somehow stop or absorb such strikes is
somehow expected to stop what 3 miles of sky could not? That is what
the standby UPS is expected to accomplish? Anything stopped by a
standby UPS is already made irrelevant by what exists inside electronic
appliances.

Meanwhile, another wire carries a destructive surge completely around
a standby UPS and directly into an adjacent appliance. That green
safety ground wire bypasses protection of a UPS and of a power supply;
transient connected directly to computer motherboard.

Any protection that claims to stop or absorb surges is doing what is
already inside the appliance. We need protection so that a surge never
gets near that appliance. That means both earthing (the most critical
protection 'system' component) and protector so that a transient does
not even enter a building.

Any protector that will somehow 'absorb' a surge will not protect
electronics. Electronics are damaged because that same 'stop' function
already inside the electronics is overwhelmed.

Do surge protectors wear out? Yes, MOVs do degrade. Therefore MOVs
must be properly sized so that degradation is not relevant. Any
effective protector must earth a direct lightning strike and remain
functional. Such protectors are sold by responsible manufacturers such
as Square D, Cutler-Hammer, Leviton, Siemens, Intermatic, and GE.
Such protectors are sold in Home Depot, Lowes, and electrical supply
houses. Such protectors are not found in Radio Shack, Sears, Wal-Mart,
Staples, Circuit City, K-mart, Office Max, Best Buy, or your grocery
store. Many plug-in protectors are so grossly undersized so that MOVs
will smoke or fail after a first surge. This failure promotes sales to
the naive by the naive. Failure of a protector during a surge means no
effective protection. Effective protectors are sized to make direct
lightning strikes irrelevant.

If protectors are 'wearing out' or degrading in a year, then the
homeowner is probably replacing dimmer switches, smoke detectors,
dishwashers, and clock radios every month. Of the protector was so
grossly undersized that transients, too small to harm any electronics,
instead cause protector failure. Again, this intentional undersizing
increases profits AND gets the naive to recommend plug-in protectors.

Properly sized protectors must earth a direct lightning strike and
remain functional. Standby UPSes protect from transients that must
be made irrelevant by protection already inside electronics. Internal
appliance protection, instead, demands a building have a properly
earthed 'whole house' protector. 'Whole house' protector so that
protection already inside appliances and inside that standby UPS is not
overwhelmed.

Barry Watzman wrote:
> RE: "Would the standby UPS protect against surges?"
>
> Yes, because the incoming power goes through a surge protector in all
> cases, before going to anything (the surge protected outlets, the
> battery charger, or the "transfer" relay that switches the battery
> backup outlets between the power line and the inverter output).
> Everything is connected to the power line through the surge protector.
> However, there are limits on the level of surge that can be absorbed.
> There are even limits with a full-time UPS; In the worst case, a direct
> lightening strike to a utility line feeding a house is probably going to
> smoke almost everything electrical in the entire house no matter what.

On Dec 8, 5:31 pm, "w_tom" <w_t...@usa.net> wrote:

The best information I have seen on surges and surge protection is at
http://www.mikeholt.com/files/PDF/Li...ion_May051.pdf
- the title is "How to protect your house and its contents from
lightning: IEEE guide for surge protection of equipment connected to AC
power and communication circuits" published by the IEEE in 2005 (the
IEEE is the dominant organization of electrical and electronic
engineers in the US).

A second guide is
http://www.nist.gov/public_affairs/p.../surgesfnl.pdf
- this is the "NIST recommended practice guide: Surges Happen!: how to
protect the appliances in your home" published by the National
Institute of Standards and Technology (the US government agency
formerly called the National Bureau of Standards) in 2001

Both guides were intended for wide distribution to the general public
to explain surges and how to protect against them. The IEEE guide was
targeted at people who have some (not much) technical background.

>
> Any protector that will somehow stop or absorb such strikes is
> somehow expected to stop what 3 miles of sky could not? That is what
> the standby UPS is expected to accomplish? Anything stopped by a
> standby UPS is already made irrelevant by what exists inside electronic
> appliances.
Plug--in suppressors do not "stop" or "absorb" surges. As clearly
described in the IEEE guide, they clamp the voltage on all wires (power
and signal) to the common ground at the surge suppressor. The clamped
voltages are not damaging to the connected equipment.

>
> Meanwhile, another wire carries a destructive surge completely around
> a standby UPS and directly into an adjacent appliance. That green
> safety ground wire bypasses protection of a UPS and of a power supply;
> transient connected directly to computer motherboard.
The voltage on all wires is clamped to the common ground.


>
> Any protector that will somehow 'absorb' a surge will not protect
> electronics. Electronics are damaged because that same 'stop' function
> already inside the electronics is overwhelmed.
If you could read you could learn plug-in suppressors do not "absorb"
or "stop". They CLAMP.

>
> Do surge protectors wear out? Yes, MOVs do degrade. Therefore MOVs
> must be properly sized so that degradation is not relevant. Any
> effective protector must earth a direct lightning strike and remain
> functional.
Plug-in suppressors are available from junk to very high ratings.
The total cumulative energy rating of a MOV will be much higher than
the stated energy rating if the stated energy rating is much higher
that the single event hits. Higher energy ratings do not just raise the
simple sum of energy hits that can be absorbed.


> Many plug-in protectors are so grossly undersized so that MOVs
> will smoke or fail after a first surge. This failure promotes sales to
> the naive by the naive. Failure of a protector during a surge means no
> effective protection. Effective protectors are sized to make direct
> lightning strikes irrelevant.
Plug-in suppressors are available from junk ot very high ratings

Note that interconnected equipment needs to be connected to the same
plug-in suppressor, or interconnecting wires, like LAN need to go
through the suppressor. Other external wires like phone, CATV, ... also
need to go thorugh the suppressor. The voltage on all wires to a
protected device needs to be clamped to the common ground. This is
called a Surge Reference Equalizer in the IEEE guide (but thay are not
sold under that name).

--
bud--

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