Lobster tank GFCI protection?

Status
Not open for further replies.
Wire-Smith said:
lower

think of tap water compared to a copper wire

salt water is more conductive(like the copper wire)

talking voltage gradients here

saltwater is safer
Click to expand...

saltwater has a much lower resistivity, much

if the current/area is smaller like in a wire the v gradient v/L is higher

the gadient is not a number but a vector field
in the straight line it is highest
as the radius/distance from that line incresses it gets lower
as does i, and since Z is constant and v = iZ, v gets smaller
so the denser the i 'field' the higher the v gradient
and the lower the Z the higher the i density

hi v line
in air it is low, large area path to gnd
in moist more conductive air the path becomes more focused, higher v gradient

but if you integrate and avg the whole E field it will be the same
since L and v are the same
 
mbrooke said:
About the lobster tank, correct. But again, the NEC shows that the concern in GFCIs was more about missing EGCs and less about water.


Clearly: If everything the is energized in and around the lobster tank has an EGC I believe IMO there is no risk.
Click to expand...

wrong
it is safer even with an egc
and all nec locations involve water/moisture

wrong, unless the egc is in the tank
and even then if the tanknis energized and the person is in parallel the gfci is safer
 
ggunn said:
The problem with eggshell fragments is that they are heavier (denser) than water and tend to settle out of the stream as it flows away from the house. Grease is a problem, too, of course.
Click to expand...
The biggest grease problem is when someone tries to flush grease down with hot water instead of grinding it up into tiny globules running cold water. It will cool and harden down the pipes a ways
The exception is when you solubleize (dissolve) the grease with detergent before letting it run down the drain.

Sent from my XT1585 using Tapatalk
 
kwired said:
Guns can run out of ammunition though;)

I think the bigger problem is grease being poured down drain, then increased amount of solids from the disposer to get hung up in the grease. Eggshells are abrasive if you get them to flow may actually do some cleaning along the way.
Click to expand...

and can be reloaded
rather have the gun
 
Ingenieur said:
wrong
it is safer even with an egc
and all nec locations involve water/moisture
Click to expand...

I agree both GFCI and EGC are safer than EGC alone. But if I had to choose between an EGC and GFCI only, I would choose an EGC.

Don't take this the wrong way- but you are thinking of GFCI like the public. Water, Water, wet, Water, Water, Water, moist, wet, Water, ect, ect. CMPs saw it as failed or missing EGCs.

FWIW I know of UK installations where again if you have a ground prove method (extra wire, solenoid activates the live conductors) you can again skip GFP.

wrong, unless the egc is in the tank
and even then if the tanknis energized and the person is in parallel the gfci is safer
Click to expand...


You truly believe water will trip a breaker. It won't.
 
[FONT=&quot]
[/FONT]
d2e6674e86b27c1be31ef78950475c388364034a
[FONT=&quot]This is the electric field at point
eef61bd7b0399664ceab99fdf78c7de593c9e860
due to the point charge
9daa41f6e8f78ea6bb5711d7ac97901ce564b94e
; it is a vector equal to the Coulomb force per unit charge that a positive point charge would experience at the position
eef61bd7b0399664ceab99fdf78c7de593c9e860
. Since this formula gives the electric field magnitude and direction at any point
eef61bd7b0399664ceab99fdf78c7de593c9e860
in space (except at the location of the charge itself,
47d12dfafcce2f076b54648a5856d0708448fd03
, where it becomes infinite) it defines a vector field. From the above formula it can be seen that the electric field due to a point charge is everywhere directed away from the charge if it is positive, and toward the charge if it is negative, and its magnitude decreases with the inverse square of the distance from the charge.

as Z increases so does the i field or B, which coexists with E
and E's magnitude decreases
so tap water with hi Z has a more dispersed (therefor lower gradient) than lower Z salt water
ie, salt water has a higher gradient[/FONT]
 
mbrooke said:
I agree both GFCI and EGC are safer than EGC alone. But if I had to choose between an EGC and GFCI only, I would choose an EGC.

Don't take this the wrong way- but you are thinking of GFCI like the public. Water, Water, wet, Water, Water, Water, moist, wet, Water, ect, ect. CMPs saw it as failed or missing EGCs.

FWIW I know of UK installations where again if you have a ground prove method (extra wire, solenoid activates the live conductors) you can again skip GFP.

You truly believe water will trip a breaker. It won't.
Click to expand...

your nonsense and misinterpretation does not change facts
egc 1 ohm
you 1000
ohm
120/1001 ~ 120 mA = no trip, gfci = trip
bad choice

every code required location involves water
missing egc is not mentioned

people have tripped gfci when wet
proof that it trips
 
Status
Not open for further replies.
Top