On May 25, 3:03*am, bud-- wrote:
* If the earthing electrode is only a ground rod, about 70% of the
voltage drop is in the first 3 feet from the electrode. There will be
over 7,000V from service 'ground' to earth beyond 3 feet from the rod.
The furnace is likely to sit on a conductive concrete floor over 3 feet
from the ground rod. *There may be over 7,000V from power wires to
'ground' at the furnace.
Bud promotes for plug-in protectors and will say anything to avoid
admitting his conflict of interest. The effective surge protector
makes a very short connection to earth. Then it increases that
protection by increasing the distance between protector and protected
electronics. IOW it must have lowest impedance to earth ground AND
higher impedance to electronics. What determines impedance? To lower
impedance, that earthing wire must be short, have no sharp bends, no
splices, separated from other conductors, and not inside metallic
conduit. All these engineering facts are ignored by Bud who promotes
protectors without any earthing.
So go to what Electrical Engineers say. Electrical Engineering
Times is blunt about what provides protection. Notice they don't
discuss plug-in protectors. Protection is defined by what provides
that protection: earth ground and the short connection to earth
ground. The article is quite blunt about what it defines: "Protecting
Electrical Devices from Lightning Transients". Both top of the front
page articles are found at:
http://www.planetanalog.com/showArti...leID=201807127
http://www.planetanalog.com/showArti...leID=201807830
This is what engineers said even seventy years ago. This
contradicts what a sales promoter (Bud) posts. Both articles are for
engineers - not for sales promoters who hype mythical protection from
plug-in protectors. A protector is only as effective as its earth
ground.
So Bud starts his insults of this poster as he does everywhere. The
plug-in protector claims to provide protection? Where? For maybe the
600th time, Bud is challenged top provide a single plug-in
manufacturer spec that claims protection. Bud will not. No plug-in
manufacturer will claim protection from the destructive type of surge
in manufacturer specs. Why? The protector is only as effective as
its earth ground. A plug-in protector - as made so obvious in
Electrical Engineering Times - does not provide effective protection.
Let's see. We install one 'whole house' protector with earthing
that meets and exceed post 1990 electrical code for maybe $1 per
protected appliance. Or we spend $25 or $150 per protected appliance
for what Bud recommends. Do increased profits mean better protection?
Or do you install what telcos have installed routinely (for no damage)
even 100 years ago? The protector is only as effective as its earth
ground - as even Ben Franklin demonstrated with lightning rods in
1752. Why does Bud repeatedly oppose this and then insult this
poster? Profits are at risk.
Why do responsible manufacturers (ie Leviton, Cutler-Hammer, Square
D, Intermatic, Keison, Intermatic, Siemens, GE, etc) sell 'whole
house' protectors? Why do less responsible manufacturers such as APC,
Tripplite, Belkin, and Monster Cable avoid all discussion about
earthing? The former sell effective protectors. Latter sell
protectors that maximize profits. A protector is only as effective as
its earth ground - as even Bud's own citations state - bluntly. Two
'top of the front page' articles in Electrical Engineering Times
entitled "Protecting Electrical Devices from Lightning Transients"
define what provides surge protection - the single point earth
ground. The effective protector makes a short (ie 'less than 10
foot') connection to that earthing. Bud will post anything to deny
this really - and still cannot provide a single manufacturer spec to
promote his sales myths.
The OP asked for furnace and dish washer protection. That means
surges are earthed before entering a building AND kept away from
electronics. Any protection that might work at the furnace is already
inside that furnace. Protection that can be overwhelmed if a surge is
not earthed before entering a building. As others here have noted,
the 'whole house' protector is a superior solution AND costs less
money. Less Money? Bud will post anything to protect those excessive
profit margins on plug-in protectors (from less responsible
manufacturers). Bud will not even admit who he promotes for.
Furnace protection (and everything else in the building) means one
‘whole house’ protector and upgraded ‘single point’ earth ground.
Did Bud forget to post what the IEEE says in Standards? He does
this often. From the IEEE Green Book (Standard 142):
Lightning cannot be prevented; it can only be intercepted or
diverted to a path which will, if well designed and constructed,
not result in damage. Even this means is not positive,
providing only 99.5-99.9% protection. …
Still, a 99.5% protection level will reduce the incidence of direct
strokes from one stroke per 30 years ... to one stroke per
6000 years ...
Bud is correct. A properly earthed ‘whole house’ protector will
only be maybe 99.5% effective. What do you want for something that
costs about $1 per protected appliance? After all, the $150 plug-in
protector can even contribute to damage of adjacent appliances. Oh.
Did Bud forget to mention that part? Profits are at risk.