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Hi All, Making some alterations in an existing flat and scratching my head about required supply to flat. It is all electric, 1 bed, 1 bathroom.
Electric shower 9.5kw
Instantaneous Water Heater 9.5Kw
Cooker Oven & Hob 6Kw
1 Ring main
3 Electric Heaters...
Are there are any regulations/guidance on the maximum weight that a luminaire can be if it is only supported by the plasterboard ceiling and not fixed to any joists or noggins?
I have a customer who would like a (heavy, but currently unweighed) light fitting from their old house fitted in the...
Where can I find the max Z's value for a BS3871, type 3, 32A MCB?
Iv had a look through BS7671 and done some searching online but I cannot find it. IV found some tables with listed Zs values for a 3871 but I have no idea where they originate from or how old
Could any Irish members on here either tell me the maximum number of lighting points permissable on a circuit?
I seem to remember a Fàs teacher mine saying that it was 10. The reason being that it's to do with a property being put into darkness in the event of a fault. I also think that...
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...
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...
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...
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...
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
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...
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?
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...
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