How many appliances should be on one breaker?

[trader_4]

On Sunday, January 15, 2017 at 4:44:28 PM UTC-5, James Wilkinson Sword wrot e:

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elieve you guys are stupid enough to have 1 amp cord protected at 15 amps.

no information in it whatsoever.

sn't dunked below the water table like an electrode. We were discussing co ncrete slab under a house, which will not be even damp, or you'd have a ver y soggy carpet.

/wiki/Ufer_ground

one end of the rebar up out of the concrete at a convenient location to ma ke an easy connection point for the grounding electrode.[4]

g World War II. It uses a concrete-encased electrode to improve grounding i n dry areas. The technique is used in construction of concrete foundations.

storage vaults near Tucson and Flagstaff, Arizona. Conventional grounding systems did not work well in this location since the desert terrain had no water table and very little rainfall. The extremely dry soil conditions wou ld have required hundreds of feet of copper rods to be inserted into the gr ound in order to create a low enough impedance ground to protect the buildi ngs from lightning strikes.

ction and tried to use the concrete floor to conduct. Guess what? No ligh t from the bulb!

Guess what? The current sufficient to kill you won't light a table lamp.

[trader_4]

On Sunday, January 15, 2017 at 4:47:54 PM UTC-5, James Wilkinson Sword wrot e:

e:

rote:

elieve you guys are stupid enough to have 1 amp cord protected at 15 amps.

no information in it whatsoever.

sn't dunked below the water table like an electrode. We were discussing co ncrete slab under a house, which will not be even damp, or you'd have a ver y soggy carpet.

/wiki/Ufer_ground

one end of the rebar up out of the concrete at a convenient location to ma ke an easy connection point for the grounding electrode.[4]

g World War II. It uses a concrete-encased electrode to improve grounding i n dry areas. The technique is used in construction of concrete foundations.

storage vaults near Tucson and Flagstaff, Arizona. Conventional grounding systems did not work well in this location since the desert terrain had no water table and very little rainfall. The extremely dry soil conditions wou ld have required hundreds of feet of copper rods to be inserted into the gr ound in order to create a low enough impedance ground to protect the buildi ngs from lightning strikes.

hm-m. Air dried concrete has a resistivity in the order of 10 000 ohm-m, w hilst oven-dry concrete has a resistivity in the order of 100 000 000 ohm-m ."

g it with a 1m^2 foot! Now I know you're a dopey Neanderthal who can't und erstand maths, sorry "math", but even your feet aren't that big. And 10 ko hms is a big RESISTANCE.

You should start with the fact that you don't understand the numbers you are using. That number is 10,000 *ohm-meters* for the resistivity of concrete, not square meters. And then proceed understanding that a concrete floor on grade is not "air dried".

Next!

[James Wilkinson Sword]

18g is rather thick for a lamp. We use that for a vacuum cleaner. I prefer a nice flexible wire.

[James Wilkinson Sword]

Do you say mathematics or mathematic?

We don't use 18g in lamp cords, as we have the sense to fuse them adequately.

[James Wilkinson Sword]

Dry concrete is a good insulator. Wet concrete is a poor conductor (but good enough to give you a shock). Tell me why your concrete floor is damp.

[trader_4]

Then by all means, stay in the UK and don't ever come here. Real men don't find 18g lamp cord inflexible.

[trader_4]

On Monday, January 16, 2017 at 7:37:36 PM UTC-5, James Wilkinson Sword wrot e:

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rrying it can take.

19A. That's very hot.

temperature. Multiply THAT by 19 squared.

t believe you guys are stupid enough to have 1 amp cord protected at 15 amp s.

as no information in it whatsoever.

e isn't dunked below the water table like an electrode. We were discussing concrete slab under a house, which will not be even damp, or you'd have a very soggy carpet.

org/wiki/Ufer_ground

ing one end of the rebar up out of the concrete at a convenient location to make an easy connection point for the grounding electrode.[4]

ring World War II. It uses a concrete-encased electrode to improve groundin g in dry areas. The technique is used in construction of concrete foundatio ns.

omb storage vaults near Tucson and Flagstaff, Arizona. Conventional groundi ng systems did not work well in this location since the desert terrain had no water table and very little rainfall. The extremely dry soil conditions would have required hundreds of feet of copper rods to be inserted into the ground in order to create a low enough impedance ground to protect the bui ldings from lightning strikes.

ucts, aided by the surface area of the concrete. You need to put the concr ete deep underground to make an electrode. I don't know about your weird c oncrete base housing, but ours has concrete round the edges, deep under the supporting walls. That foundation will probably touch the water table. S o if there was a wire inside it, that wire would be earthed. But not the d ry insulating parts of the concrete.

Because it's poured ON GRADE, idiot.

[James Wilkinson Sword]

Since your foot is less than a square metre, hat makes it a higher number than that.

My floor isn't resting on a water table. If it was I'd have big problems.

[James Wilkinson Sword]

But it's not the men that are flexing it, it's gravity.

[James Wilkinson Sword]

The dampness years after pouring is nothing to do with the pouring.

[trader_4]

On Tuesday, January 17, 2017 at 12:29:30 PM UTC-5, James Wilkinson Sword wr ote:

e:

rote:

t believe you guys are stupid enough to have 1 amp cord protected at 15 amp s.

as no information in it whatsoever.

e isn't dunked below the water table like an electrode. We were discussing concrete slab under a house, which will not be even damp, or you'd have a very soggy carpet.

org/wiki/Ufer_ground

ing one end of the rebar up out of the concrete at a convenient location to make an easy connection point for the grounding electrode.[4]

ring World War II. It uses a concrete-encased electrode to improve groundin g in dry areas. The technique is used in construction of concrete foundatio ns.

omb storage vaults near Tucson and Flagstaff, Arizona. Conventional groundi ng systems did not work well in this location since the desert terrain had no water table and very little rainfall. The extremely dry soil conditions would have required hundreds of feet of copper rods to be inserted into the ground in order to create a low enough impedance ground to protect the bui ldings from lightning strikes.

0 ohm-m. Air dried concrete has a resistivity in the order of 10 000 ohm-m , whilst oven-dry concrete has a resistivity in the order of 100 000 000 oh m-m."

hing it with a 1m^2 foot! Now I know you're a dopey Neanderthal who can't understand maths, sorry "math", but even your feet aren't that big. And 10 kohms is a big RESISTANCE.

Again, you don't understand that the unit is ohms-meter and that resistivity is not resistance.

Sitting on grade is not sitting on a water table, idiot.

[James Wilkinson Sword]

Have a little think about it. It IS ohms. It's ohms if you consider a cubic metre of the substance. Now think about the actual shape of it you're using when you're "earthed" by your feet on it.

Is it wet or not? Stop making up terms. We don't talk about "grade" here., whatever that is.

[James Wilkinson Sword]

You bring up ufers whenever we talk about house footings.

Oh look, so many metal things in direct contact with the ground, OUTSIDE the concrete.

No, it's lower. Dig a hole and see how deep before it fills with water.

[James Wilkinson Sword]

I understand it perfectly. There is virtually nothing that is a pure insulator or a conductor. An ufer uses a very very poor conductor (ie. an insulator, concrete), but a very large amount of it. Now, how large are your feet?

[gfretwell]

In most residential you will not have any of those so they require the Ufer now. Note that it says "electrodes that are present" and none of them will be. We used to have a great grounding grid when the whole city was bonded together with a metal piping system. Pipes are all plastic now.

[James Wilkinson Sword]

I have no grounding in my house at all. The ground is supplied by the electricity company at the substation (transformer) for the street. Presumably they have a big rod or something. A two core cable comes to my house, ground and 240V live.

[trader_4]

No, it's not. Resistance and Resistivity are two different things. One is measured in ohms, the other ohms-meter and you don't understand the difference.

Now think about the actual shape of it you're using when you're "earthed" by your feet on it.

Clueless as always, and incapable of even understanding pictures. I gave you a link that shows a Ufer electrode inside a slab poured on grade, which is the SURFACE OF THE EARTH. It even had grass growing next to it. It's not "below the water table", which was your idiotic claim for a Ufer to work.

[James Wilkinson Sword]

Resistivity is defined as ohms through a metre squared block. Jeez you're thick.

Much less than a metre squared.

It's got metal rods in contact with a lot more concrete than your foot.

[trader_4]

Then why did you take resistivity, which is in ohm - meters and claim it's the resistance you'd obtain standing on the floor?

And is the floor a meter thick, idiot?

Which wouldn't matter if a concrete slab was an insulator, like you claimed.

[James Wilkinson Sword]

I claimed standing on the floor would make it significantly higher than the standard ohms per metre cubed.

Please think before making a fool of yourself. Make the floor 10cm thick, and you have decreased the resistance by a factor of 10. Make your foot 24 x 8cm and you have increased the resistance by a factor of 52.

No such thing as a pure insulator. Remove your pedantry and the conversation can continue.