We've had this discussion before, but does anyone have any idea what load can be put through a double socket?
The socket in question is an MK logicplus, installed in a commercial kitchen. The supply cable is 6mm, converted from a previous cooker circuit to a double socket. (information gathered...
hi guys,
Seen on the circuit details schedule in a DB on our site, someone had inserted Zs values for the circuits as follows.
16a C type breaker as 1.44 ohms
10a C type breaker as 2.30 ohms
80a C type breaker as 0.28 ohms
I believe he’s calculated Zs by doing (in the case of 16amp c...
If the Ze on a TNS supply is measured at 0.8ohms, is this still acceptable?
Technically it is bang on the maximum.
DB is 100A Main Switch with 30mA RCBO's on all circuits.
Hi Everyone,
I would like to confirm a question I saw the other day regarding working out the residual current on an RCD
The question was similar to the following
An earth electrode has been measured and the following readings were taken
1) 21 Ohms
2) 21.02 Ohms
3) 20.8 Ohms
What is the...
How much current capacity can handle in a 16 sq. Mm. Wire size in ac 415 volt supply?
Because i have 2 pump motors that will connect to a power source of 415 volts ac 3 phase; 1 motor is 5.5kilowatts and another one is 7.5kilowatts. Both motors will run intermittently and supplying different...
Can anyone point me in the right direction.
I am working for a company who do temp power for welders etc from a generator.
We have been given a load of new boards to pre check befor they go on site. Powerlock connectors in and then D63 on a commando sockets.
I have put the maximum zs of...
I have alluded to this in previous threads. The commercial site I work on has asked me what I think the total KVA for the site is. Having looked at various ways of viewing this I am getting lost with it. So if I just say
kVA = ( V*A*1.73)/1000 and assume supply is 400V and take the main incomer...
Hello,
I am assisting my supervisor and getting some first hand experience of completing certification by filling in an electronic copy of an EIC, working from a handwritten circuit schedule with test results and my memories of the installation work.
I am at home so cannot ask him for advice...
Hello,
I live in a house where part of the wiring dates to 1960 (exact). Now I know after ~30 years old, a rewire is advised. And at 58 years it should definitely be rewired, but it's going to be difficult to convince my parents to have the house rewired soon - as we have 5 people living here...
really trying to get the customer to see sense, they have supplied scaffold tower for lighting replacement about 5metres off the ground, which i have been pottering away at with this shitty scaffold tower getting stuck in the sand below and hitting against the beams of the shed itself
almost...
Hello the on site guide lists 20 amp maximum mcb for 16 amps sockets. Having a debate with someone as to why this is? Why not 16amp mcb? I installed 20 amp mcb as it's for a car charger that charger's at 16amps for 8 hours and is not capable of pulling more than 16 amps but this has been pulled...
Hi, I am studying to become an electrician. I got a question wrong on a practice test.
Can anyone help me understand maximum demand.
this is the question I got wrong.....
Question 27: With reference to the nature of the supply, which one of the following can be determined by calculation...
Hi,
I'm looking at installing a solar water system for a friend. He runs a B&B so has much higher hot water needs during the summer, and also a very high annual bill for heating and water. So it seems like he's ideally suited for a solar thermal system to at least reduce the costs.
We live in...
If the maximum zs is okay up until 1667 ohms protected by a rcd why do we care about maximum disconnection times for the mcbs e.g why do we test and it's important to meet 1.37 or 1.1 zs on a 32 amp circuit
i need to wire in an induction hob which is 6.5kw and the cable already chased in is 4mm and would be a real pain to replace for a bigger. I just wanted to know if it would be alright or play it safe with a 6mm?
Evening all. At the risk of being ridiculed I wonder if someone can clarify something for me!
On the initial inspection forms for installations there is a box for "maximum Demand". This can be in KVA or amps. I've been told that you add all the breakers on the board up then it is 40% of this...
Hi,
Can anyone point me in the direction of the regulation / code for the max solar MCB size when connecting into a spare way of a local distribution board ?
Eg. Is it possible to connect a 100A breaker into a 100A board ?
Just started doing my first block of flats as a Qualified supervisor.
I have 5 flats and a landlords supply to wire up.
Done my calculations a while back and told the DNO I would need require ADMD of 12.5 kva for each flat which I thought was reasonable, Considering I have 3 rings, 2...
Hi all,
Quick question when doing r1+r2 testing wether its a new install or a EICR, is there a table to show maximum readings we should be getting? Or is it a calculation?
Thanks in advance
Luke
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