On May 4, 9:48*am, bud-- wrote:
ransley wrote:
On May 4, 12:49 am, bud-- wrote:
Caesar Romano wrote:
If two surge protectors are connected in series, is the amount of
surge protection available at the down-stream protector approximately
equal to the sum of the two individual protections??
Outlet strips are not intended by anyone, including UL, to be connected
in series.

Which protector does the protecting depends on which MOV clamps at a
lower voltage. Voltage ratings, like 330V, are UL categories and cover a
wide range. Even MOVs with the same part number that are not from the
same batch would not likely have identical clamp characteristics. The
upstream or downstream protector may initially do the clamping or it may
be partially or evenly shared.

You would probably get a combined Joule rating equal to the sum of the
individual ratings. If the clamping was actually evenly shared the
combined cumulative rating would be higher than the sum of the
individual ratings.

IMHO loads should only be connected to the downstream protector.

I recommend not connecting in series. Suppressors with very high ratings
are readily available at relatively low cost.

And all interconnected equipment needs to be connected to the same
plug-in suppressor, or interconnecting wires need to go through the
suppressor. External connections, like phone, also need to go through
the suppressor. Connecting all wiring through the suppressor prevents
damaging voltages between power and signal wires.

--
bud--

Tell that to Tripp Lite, they sell one of the best units made. In fact
im fairly certain they were the first to offer a warranty against
lightning damage.

You aren't specific about which of the many things I said I should tell
to Tripp Lite.

I presume it is that suppressors shouldn't be connected in *series. From
the UL White Book:
"Relocatable power taps [power strips, which plug-in suppressors are a
variation of] are not intended to be series connected (daisy chained) to
other relocatable power taps or to extension cords."

--
bud--- Hide quoted text -

- Show quoted text -

Again tell that to Tripp Lite. Some of Trips units with multiple
outlets have increased protection for each outlet as you move away
from the power cord, daisy chaining is only like a strip with
additional outlets. Stick your UL book and learn, call Tripp, mr UL
book.