30 amp off a ringmain trick

[the snooper]

Still hypothetically speaking you could actually make a contraption like that a safe device to use if one plug was removed. All you would need to do is fit a couple of 240v relays/contactors that disconect the circuit if either plug is out.

i think you may find that hard to do as once both relays were operated and you pulled 1 plug the feed from the other plug would latch the second relay, it would be possible using dc and diodes

 

[madkayaker]

That's a very fast way to kill your self and or burn the house down! Yes a ring final circuit (proper name as arcing is a HV term for a feeder fed from multi points) is rated at 32A but the cable used for it is rated at about 15-20A depending on factors in installation (and my regs book is upstairs and I'm not) so if you try to pull 32A you will over heat the cable which might result in fire. A RFC should be designed so that one leg is not over loaded by for example putting all the panel heaters on one cable.

 

[brightspark]

Just to continue the two plug theme for your amusement and brain training, this was how the motor was wired up on a lathe I bought off ebay...I kid you not!

Lack of any form of earthing whatever was interesting!

and u carried the theme on by wiring a 30 amp socket up the same way words fail me nothing i havent seen before in 40 years

 

[the snooper]

(proper name as arcing is a HV term for a feeder fed from multi points)

cant find any other mention of the word arcing in the thread, care to elaborate please?

 

[Gritineye]

and u carried the theme on by wiring a 30 amp socket up the same way words fail me nothing i havent seen before in 40 years

Not quite the same way, but pretty silly I have to admit.

Grave (no pun intended) doubts crept into my mind as to what I was doing so I posted it on here before trying out my "adaptor".

But the guy who sold the lathe said it worked fine!

 

[madkayaker]

Sorry auto connect. Replace arcing with ring

 

[the snooper]

Sorry auto connect. Replace arcing with ring

get rid of it it doesnt even work on your reply

 

[Country Joe]

Sorry auto connect.

And that was auto correct, doing it's thing again?
CJ

Damn, Snooper got there first!

 

[madkayaker]

******

 

[Drains]

It's funny looking at this and thinking "woo, that's dodgy", then remembering a conversation at work today where three of us are standing looking at an 11KV incomer box and discussing where is the appropriate place to stand considering that though the incomer is on, the busbar is not live and the loads are not connected (so all in all, safe...ish). We were thinking, how would you compare the power of the ZAP? Would it be like being hit by a freight train at 60 mph, or what?

 

[the snooper]

i reckon worse then that

 

[madkayaker]

Hit by a very fast train I bet

 

[tigler]

You wouldn't know about it !! The first 15 MA kills you the rest just fries you !!

 

[madkayaker]

Works a bit different with HV the heating effect is very large so it tends to cook more than shock. But it will also cause every muscle in your body to contract and it's not unheard of in big shocks for the victim to have broken bones

 

[tigler]

These give some idea !! :-

https://www.youtube.com/watch?v=-iClXrd50Z8

No sound on this next one but it's bl00dy nasty !!!

https://www.youtube.com/watch?v=W6Im7PLduwc

 

[snowcat]

It's funny looking at this and thinking "woo, that's dodgy", then remembering a conversation at work today where three of us are standing looking at an 11KV incomer box and discussing where is the appropriate place to stand considering that though the incomer is on, the busbar is not live and the loads are not connected (so all in all, safe...ish). We were thinking, how would you compare the power of the ZAP? Would it be like being hit by a freight train at 60 mph, or what?

Im guessing tho, Its not as simple as that, and must be Dependant on the path the electric takes through your body, Some survive lightning strikes at 300million Volts where as some (such as a good Friend of mine) are killed outright from touching 240V with damp hands.. I once cut through a 300amp 3ph supply with a set of bolt cropper's without a tingle.

I think the other consideration is electric shock can cause long term damage which is often forgotten about, this can be physical, but also mental...

 

[piman]

Hello Wherersmejumper,

" a double socket isnt rated anywhere near 30 amps.closer to 15"

Where's did that come from, both sides should carry 13A each forever and a day?

Rtbcomp, a 13A fuse doesn't blow if it carries more than 13A, at least not immediately, the greater the overload the quicker it will blow.


PS, from this link, http://wiki.diyfaq.org.uk/index.php?title=Fuse, a 13 amp fuse should carry 14 amps for between 3 and 20 seconds before. blowing.

Alec

 

[GeorgiePorgie]

Where's did that come from, both sides should carry 13A each forever and a day?

why did you question your own post? A double 13amp socket is just as it is 13amp and using the double socket to get double the rating is not possible,plus the fact the RCD is rated at 15amp so anything pulling above the rated RCD will trip it,otherwise the RCD is not doing its job.

 

[Welderpaul]

I had the misfortune to see an ex colleague cut through a phase of a 3ph supply (with no load on mind), with a pair of insulated cutters that had a nick in the insulation on the handles. It threw him across the floor of the building a good 10m with a great bang and puff of black smoke. He had bad burns to his face and arms and was hospitalised for a week. He had basically cooked. Within 6 months he was back in hospital with heart problems that are ongoing to this day. He got a good compo payout, the service was certified as dead, the permit to work wasnt correct, and the insulated cutters had been inspected and passed 2 days earlier. It shouldnt have been live and he paid the price. Turned out the termination that he was cutting was back fed from somewhere else that no one knew about. These days it would have been spiked first. If only he had worn his 'marigolds' 3 people lost their jobs over that.
On the flip side, i've seen a 360 bucket go through an 11kv cable (as in ripped it in half) with no more than a gentle poof. (Although an adjacent tree did catch fire).
Horrible stuff lecky.

 

[GeorgiePorgie]

a friend told me this setup can be seen in use in the theatrical lighting world

There must be a lot of cowboys on the set then.

I wonder if Elf&Safty know about this?