Browse Forums Building Standards; Getting It Right! Re: Electric cable standard - 2.5 mm2 twin & earth cable eno 2Aug 30, 2011 6:27 am Landscape Design & Construction http://cherub.squarespace.com/ Re: Electric cable standard - 2.5 mm2 twin & earth cable eno 5Sep 01, 2011 4:27 pm Electrical - Automation - Smart wiring - New homes - Commercial - Data cabling] 1300 050 315 www.cenemelectrical.com.au www.facebook.com/cenemelectrical Re: Electric cable standard - 2.5 mm2 twin & earth cable eno 11Sep 05, 2011 11:13 pm Electrical - Automation - Smart wiring - New homes - Commercial - Data cabling] 1300 050 315 www.cenemelectrical.com.au www.facebook.com/cenemelectrical Re: Electric cable standard - 2.5 mm2 twin & earth cable eno 15May 17, 2015 5:34 pm While I appreciate this is thread is somewhat old, I'd suggest people factor is use and load rather than cable size. In the kitchen, most people will use a kettle (many of these are 2400W) and most laundry's will have a dryer (one I checked is rated at 8 amps). Put these on the same 16A circuit which is what most 2.5mm2 2C+E TPS is rated at (other than free air) and You now have 18Amps being drawn and the circuit breaker is likely to trip. So if you want to be able to use your kettle and dryer at the same time - ie have a hot coffee/tea, then you may want to ensure that the laundry and kitchen are on separate circuits. A higher capacity circuit typically wouldn't be used for domestic appliances because of the impact of a fault - do you really want to give your kettle that normally uses 10A, 30A or more in a fault situation ? Also this is why fridges are often on their own circuit - lets say a fault in a tv trips the breaker while you are away; most people don't like coming home to a (semi) defrosted fridge when they've been out for a few hours - if you are away for a week and the situation is even worse. Moving on to ovens some use 3100W and some use 5-6000W ... A 3100W may work with 2.5mm2 2C+E; however some people prefer to use 4mm2 as the oven is expected to draw a high current for extended periods of time (unlike a kettle). Obviously a 6kW oven, drawing 25A is going to require thicker wire than 2.5mm2. So I'd check the manufacturers guide for the oven. As for lighting - there are a number of standards surrounding drops, however don't exceed the load - 45 x 50w globes are 2250w or less than 10A; 45 x 100w globes are 4500w or 18.75A. As for power points - again, think of use and how many you want to use at once and what for - many domestic appliances and lamps don't use a lot of power, so don't need separate circuits. And every separate circuit will cost; this "cost" is much cheaper at build time than afterwards; however overloading circuits and risking a fire is something most people would prefer to avoid ... especially after the fire. Most electricians if you talk to them about what you are doing are pretty good; and if needed get specialist advice. Re: Electric cable standard - 2.5 mm2 twin & earth cable eno 16May 20, 2015 3:12 am Glad to find this thread. I need advice on this subject. I have just purchased a 40 amp plasma cutter, for hobby use I guess you would say. Now I also need to get some clarification about this. How do I determine if the wiring in my flat can handle 40 amps ? Obviously just changing the gauge of the fuse wire would be dangerous if the wiring is not rated to handle at least 40 amps. I suppose I will need to call in an electrician to get a reliable answer based on examining my wiring and fuse box. Where are the relevant electrical building standards available ? Thanks for any advice you can provide. Re: Electric cable standard - 2.5 mm2 twin & earth cable eno 17May 20, 2015 8:51 am All good advice above. It's good to see some licenced sparkies chiming in to this forum with their views. As per above. I use a 40 -140amp stick welder at home off a 15amp circuit. How does that work ??? Stewie ( definiely a non-sparky ) Re: Electric cable standard - 2.5 mm2 twin & earth cable eno 18May 20, 2015 9:17 am Stewie D All good advice above. It's good to see some licenced sparkies chiming in to this forum with their views. As per above. I use a 40 -140amp stick welder at home off a 15amp circuit. How does that work ??? Stewie ( definiely a non-sparky ) Are you talking about a 15amp circuit breaker or 15amp gpo ? A 15amp circuit breaker is usually a 16amp cb, and 2.5mm twin and earth. A 15A gpo is usually on 4mm twin and earth with a 20A CB. The current output from your welder is at a lower voltage, so the welder is consuming less than 15A on the 240v side. Seen in some USA HT forums, the need for 110v 20A powerpoints for their power amps, where over here the same amp (dual voltage transformers inside) can be plugged straight in to a standard 230v 15A powerpoint.... the lower the voltage needs greater current draw. <standard disclaimer> I am not a sparky ! Owner Building at Jimboomba Woods in Logan City Qld. Blog : http://bandlnewhomebuild.blogspot.com H1 thread : viewtopic.php?f=38&t=68283 . Re: Electric cable standard - 2.5 mm2 twin & earth cable eno 19May 20, 2015 10:15 am With welders / cutters, the current rating of 40A or 140A is about the current on the output of the welder. This is much higher than the input current. The reason it doesn't draw this much current is that it can use a transformer (or equivalent alternative) to transform the voltage and current. A 10:1 transformer can take 240V at 10A and produce 24V at 100A. In both case it is the same amount of power. So to see if your wiring can handle a device, you need to look at the input power draw, which should be on the labelling. If it has a standard 10A plug, this should be less than 10A. Most of the time, council will push you out to a private certifier as it ties up their limited resources. Where a builder has gone belly up, the certifier passes the file… 7 5370 As per title, unsure if my land doesn’t have enough fill. The house on the left seems to have higher elevation. Not sure if the empty lot in between has just been… 0 540 Hi everyone! This is my first time posting here, and I'm looking for some advice regarding my house construction project in North Kellyville. I… 0 6695 |