|
| Amazing that 'testimonials' prove APC products effective. Castro
aslo proves things using same propaganda techniques. One need not be
technical - only American - to see through these half truths. If it
claims to accomplish something, then you will find it in those
specifications. No claim in the specs? Did you also believe Geritol
commercials? Apparently. They published testimonials but forgot to
put any numbers to those claims. Therein lies all the techy-ness one
needs. Their own specs don't even claim hardware protection.
And then we added reasons why - how even the simplest person can
identify ineffective protection:
> Numerous ineffective products are quickly identified. 1) No
> dedicated wire to earth ground. 2) Manufacturer avoids all discussion
> about earthing.
Well Georges responses include reference to blowhards and other
emotional nonsense. Does he really want to learn or his is ego too
large. George. If that sentence for one minute causes you any anger,
then don't bother to read beyond this. It will be too technical for
someone who judges emotionally.
OK. So now you want to learn what is effective protection - to
dispose of APC propaganda. Previously cited was:
> Effective protectors that don't have brand names such as APC,
> Tripplite, Belkin, or Isobar. Effective protectors come with
> responsible names such as Square D, Siemens, GE, Polyphaser,
> Intermatic, Levition, and Cutler-Hammer.
In each resonsible solution, the protector has a dedicated wire for
earthing. This 'whole house' solution is sold in Home Depot, Lowes,
and most electrical supply houses. A 'whole house' protector for
residential service should be rated at least 1000 joules and 50,000
amps. And - as has been noted so repeatedly - it will only be a good
as its earth ground.
That earth ground must meet and probably should exceed post 1990
National Electrical Code standards. Earthing (not a protector) is the
protection. Therefore repsonbile manufacturers discuss earthing as
demosntrated in these figures:
http://www.epri-peac.com/tutorials/sol01tut.html
http://www.erico.com/public/library...tes/tncr002.pdf
The second figure shows two structures. Each has its own earthing.
Any wire that interconnects the structures must first connect to that
structure's earthing system before entering the structure.
Of course, this is only secondary protection. Installed so that
protection already inside appliances will not be overwhelmed. You
should also inspect the primary protection system:
http://www.tvtower.com/fpl.html
Notice that APC mentions none of this. APC does not claim to provide
protection from typically destructive transients. It claims to protect
from surges that typically do not exist - AND then put up testimonials
best described as propaganda. The technical facts tell you to start
with THE most critical component of a protecton 'system'. The one
thing APC does not discuss. Earthing is the protection. Earthing is
the one component that every protection system must have. Earthing is
where effective electronics protection begins. As Sun Microsystem's
planning guide for server rooms note:
http://www.sun.com/servers/white-pa...nning-guide.pdf
> Lightning surges cannot be stopped, but they can be diverted. ...
> These should divert the power of the surge by providing a path
> to ground for the surge energy.
And as another industry professional explains:
http://www.telebyteusa.com/primer/ch6.htm
> Conceptually, lightning protection devices are switches to ground.
But somehow APC will stop, block, or absorb in their tiny box what
three mile of sky could not stop. Resposible protector manufacturers
discuss earthing extensively. APC obviously is not in that category.
APC has no dedicated earthing connection AND would have you believe
their box will stop what even three miles of sky could not.
For that hard drive, you stated:
> Now you have a problem. Your basically ungrounded PCB's were damaged
> while the grounded HDD was not.
First those PCBs must be grounded to be properly installed. To have
sufficient knowledge to even recommend electronics protection, one
should know how and why PCBs are grounded. It again suggests why APC
propaganda was effective. Both PCBs and the disk drive must be
grounded to common point - the chassis. Don't confuse this ground with
earth ground. But again, to avoid damage, the disk drives must be
properly installed. You have just defined a completely wrong
installation. It would explain disk drive failure directly traceable
to human failure.
Well reading on, you claim that ICs are not replaceable. Not to
those without basic knowledge and industry experience. Then your reply
moves on to emotional statements - some comment about gibberish due to
insufficient knowledge of the subject. If you have any logical
questions in that reply, repost them without adding your emotion that
is based on insufficient knowledge.
Your APC recommendation has been repeatedly demonstrated to be bogus.
That bogus recommendation from someone who does not know we can and do
replace ICs. Provided is how anyone can identify ineffective
protection. Earthing being THE most critical component for electronics
hardware protection and for a reliable backup system. Earthing not
provided and not discussed by ineffective protector manufacturers.
Curious George wrote:
>...
> Since I'm not posing as an electrical engineer, why don't YOU tell us
> what specs would be required to accomplish that protection?
> ...
>
> It may be naive to expect good chance of a payout but APC rackmount
> SmartUPS, for example, is widely considered reputable with those
> promises.
>
> APC Currents magazine regularly include claims of lightening
> protection, including testimonials. If their products in fact don't
> that constitutes false advertising and still goes against a
> significant part of your argument.
>
>
> the hard drive motor and interface are on the PSU's 12v & 5v rails,
> and consequently the electrical input, just like basically everything
> else on a computer. Typically the HDD metal case is grounded via
> direct mounting to the metal, grounded chassis. All PCB boards,
> including the one on the HDD, are isolated from the case's ground.
> That's why you can discharge a static shock on the case without frying
> anything. Yes current will jump more with the power of a lightening
> bolt, but HDDs aren't so unique or ungrounded as you claim.
> ...
>
> Now you have a problem. Your basically ungrounded PCB's were damaged
> while the grounded HDD was not.
> ...
|
|