Lobster tank GFCI protection?

Status
Not open for further replies.
Ingenieur said:
delving into reality? lol
you better deep dive

ashamed? lol you are really wack-a-doo
many know the reason-moisture
Click to expand...

You reject anything that does not fit your current understanding. You are unwilling to see the other side- the civilian aspect. The reality that EGC were missing or end up missing.
 
romex jockey said:
very interesting Ingenieur , i'd be interested in your methods / aproach


~RJ~
Click to expand...

started one this week
an 80 lb hook fractured
grazed a guys head an 1" below his hardhat, only skin, xx stitches

did an explosion recently
did a shock recently
each approach is different
the key is respond fast, secure the scene, isolate witnesses, offload data from machines if applicable

the reports are public
I'll see if I can find one and take my name/agency off it
 
Ingenieur said:
wrong
show me where?
what does not reflect the real world is your video lol

nope
no egc
person becomes path, so neut i not equal hot i, gfci trip
Click to expand...


Yes, no EGC, person is path- GFCI trips.

With EGC, hot contacts the frame, breaker trips= no hazard.

Even with the person touching the frame and well grounded the fault loop is such that the person is subjected to 60 volts for no more than a few cycles. No burns or fibrillation takes place because its no brief and at 60 volts.


Also again- isolated power systems. Why does the code let you skip GFCIs in critical locations with an isolated power system? It can still get wet- you can still get voltage gradients in water from current going line to line.
 
Ingenieur said:
started one this week
an 80 lb hook fractured
grazed a guys head an 1" below his hardhat, only skin, xx stitches

did an explosion recently
did a shock recently
each approach is different
the key is respond fast, secure the scene, isolate witnesses, offload data from machines if applicable

the reports are public
I'll see if I can find one and take my name/agency off it
Click to expand...

This mine only?

Try things like general electrocutions and lawsuits... See my links please:

http://paceforensic.com/pdfs/newsletter/KeepingPace-54.pdf

http://paceforensic.com/pdfs/newsletter/KeepingPace-8.pdf
 
mbrooke said:
Yes, no EGC, person is path- GFCI trips.

With EGC, hot contacts the frame, breaker trips= no hazard.

Even with the person touching the frame and well grounded the fault loop is such that the person is subjected to 60 volts for no more than a few cycles. No burns or fibrillation takes place because its no brief and at 60 volts.


Also again- isolated power systems. Why does the code let you skip GFCIs in critical locations with an isolated power system? It can still get wet- you can still get voltage gradients in water from current going line to line.
Click to expand...


I am done with you
you do not have the tools to comprehend
no offense, nothing to be ashamed of
 
mbrooke said:
6. Lifting the ground on audio equipment for noise reduction.
Click to expand...

Plug your guitar through a stereo chorus stompbox into two amplifiers. Sometimes the only way to quench the 60Hz hum is to lift the ground on one of the amps. Both amps are still chassis grounded, although one of them is grounded through the cable shield instead of through its power cord.
 
well, i know RCDs cannot properly work without the Earth Fault Loop impedance being low enough for the circuit to allow the device to trip when the fault occurs. That is why, according to the videos here on T-T systems and TNS systems, we need to verify the impedance Ze first and follow the impedance values of the circuits, to make sure that the circuit can actually trip when Z is broken, or when fault occurs.
But, still actually learning this stuff, so, cannot quote this paper or that paper at you. But, this is one reason why they allow you to actually run longer ground rods or put in extra ground rods that are bonded to each other, to drop the Z of the installation so that the safety devices can do their job properly.
 
Zs = Ze + R1 + R2


https://www.youtube.com/watch?v=PAYGFGy0TVo


https://www.youtube.com/watch?v=Ksg2zQLuiAs&t=10s
on this video, the earthing arrangement for the second arrangement is most common in the USA, I believe, as you see the neutral grounded at entry to the protection circuit.
Ze is the value of the ground resistance as measured before the main breaker.
R1 is the measurement of the resistance of the live wire for the circuit, from the breaker to the furthest outlet, and is usually done with a trailing lead or wandering lead so you need to make sure you know the resistance of this lead to subtract it from your value when you test your circuits.


R2 is the value of your ground wire from the panel box to the furthest outlet in your circuit. If the wire is the same gauge as the wire for your circuit live wire, then these values should be close to identical. But, if your wire is a different size, common in many NM cables, and when we use smaller grounds as allowed in some cases, then your value will be different.


Here in UK I am being trained to do this on every circuit as installed and at testing every so many years or if we make changes, such as adding outlets to a circuit. Loads of paperwork to do.

so..just some more stuff for you experts to argue over..lol
 
Here in UK I am being trained to do this on every circuit as installed and at testing every so many years or if we make changes, such as adding outlets to a circuit. Loads of paperwork to do.

so..just some more stuff for you experts to argue over..lol
Click to expand...

Well we don't test every circuit ….


but...


Neat vids Adam

I found another one simplifying it all>
https://youtu.be/HsWWKzjVUxE

~RJ~
 
Have that one. Think the problem is, the UK and US systems use different terminology and different grounding ideas... so, the US normal approach is a cross between the TT system and the TC C S system... because they connect the neutral to ground in the CS system but at the providers system, not at the consumer unit.. so consumer units are treated like sub panels in USA.

But still gets to the basics... if your Z is too high, the system breakers don’t trip... or don’t trip as quick...
 
Status
Not open for further replies.
Top