415v socket installation

[Rockingit]

The PSCC, on single phase is around 16,000amps, 3 phase 27,000amps.

That may be so. But my missus giving you the evil eye will guarantee to kill you faster and yet strangely more painfully.

 

[davesparks]

The PSCC, on single phase is around 16,000amps, 3 phase 27,000amps.

Ok, but you only need a fraction of an amp to kill a human so that is not really relevant.

The potential difference is the key, the more you have the more current will flow through the same resistance.
Of course it is a bit more complex than that, as the cells breakdown resistance alters etc.

 

[Knobhead]

You’ve got to be doing something incredibly stupid to get your body across two phases. The most likely event is phase to earth which is possibly but not necessarily fatal.

I doubt there’s many of you can say “I’ve never had a belt”, most of you seem to be alive.

 

[Knobhead]

The PSCC, on single phase is around 16,000amps, 3 phase 27,000amps.

Where did you get those figures from?

For a fault of that magnitude you would have to be on the terminals of a 500KVA 11/.4KV transformer (4.5% impedance).
(Based on the infinite source method.)

 

[shanky887614]

Where did you get those figures from?

For a fault of that magnitude you would have to be on the terminals of a 500KVA 11/.4KV transformer (4.5% impedance).
(Based on the infinite source method.)

as a follow up, in domestic breakers are rated at 6ka. in comerical/industrial mcbs are rated at 10ka.

 

[Engineer54]

Building supply:
There is a 415 volt supply into the building, 3 phases, 1 neutral and an earth. The 240v supply comes direct off one of the phases and feeds the sockets and lights. The other 2 phases are not used and end in the supply cupboard.

Hope that helps!

P.S. As for a quote, I have an electrician who I'm hoping can do the actual connecting to the board but I am just trying to save money on the thing I can do if possible. Thanks though!

In the first place your electrician needs to check that you are being supplied with 3 phase and 3 phase meter. It could be that the two unused Service cut-out fuses are empty and the premises at the moment being classified as a single phase supply. That is probably the case, as a 3 phase supply comes with a higher standing charge than a single phase supply.


At least you have the means available to upgrade to a 3 phase supply, but the DNO will have to come in and make the necessary upgrade.


Don't try making any assessments on your installation yourself get a qualified electrician (and i don't mean a electrical trainee DI) to make all the assessments and design an installation that conforms to current regulations that will suit your needs, that's a very important part of an electricians value, not just the actual installation itself value.

 

[telectrix]

i offered to quote him yesterday. this king of job is right up my street. been doing too much domestic lately. sick of seeing T/E that 's a pain in the arse when cold.

 

[Engineer54]

i offered to quote him yesterday. this king of job is right up my street. been doing too much domestic lately. sick of seeing T/E that 's a pain in the arse when cold.

All i can say Tel, is this so-called electrician that is willing to just make the connections to his DB sounds more like a DI or DIY Dave than an electrician to me. For a kick off he's going to need a 3 phase DB, he ain't gonna get very far with an existing single phase board is he!! lol!!

 

[Knobhead]

as a follow up, in domestic breakers are rated at 6ka. in comerical/industrial mcbs are rated at 10ka.

These are 120KA, things don't always go to plan.

 

[plugsandsparks]

mmm Tony, could it have been stressed (several times) in the past ? :biggrin:

 

[OhmElectrical]

Can I ask what level of electrical experience you have.

Do you really need to?

 

[telectrix]

mmm Tony, could it have been stressed (several times) in the past ? :biggrin:

i've been stressed loads of times, but i haven't cracked up like that -- yet.

 

[Knobhead]

There’s time yet Tel you haven’t retired.

That fuse is one of two I’ve had fail like that. The other was a TC200A feeding a PFC capacitor bank. That blew holes through the top and bottom caps but the ceramic barrel held.

I kept them for my black museum.