crisis Posted March 29, 2017 Posted March 29, 2017 I know enough about electricity to electrocute myself so is this even a thing?
Volunteer sir sanders zingmore Posted March 29, 2017 Volunteer Posted March 29, 2017 Lavardin amps have the same thing. I couldn't hear a difference 1
powerav Posted March 29, 2017 Posted March 29, 2017 They are just covering their buts if someone uses a dodgy home made power cord that is wired incorrectly.
Volunteer sir sanders zingmore Posted March 29, 2017 Volunteer Posted March 29, 2017 2 minutes ago, powerav said: They are just covering their buts if someone uses a dodgy home made power cord that is wired incorrectly. nah, don't think it makes a difference as long as live isn't connected to earth 2
powerav Posted March 29, 2017 Posted March 29, 2017 Just now, Sir Sanders Zingmore said: nah, don't think it makes a difference as long as live isn't connected to earth mmmm, wow! 1
Addicted to music Posted March 29, 2017 Posted March 29, 2017 (edited) 1 hour ago, crisis said: I know enough about electricity to electrocute myself so is this even a thing? Yes it is a thing.....All jokes aside... Safety comes first so don't F....k with it. Use an Australian approves IEC and nothing else. See diagram: Edited March 29, 2017 by Addicted to music
sloper Posted March 29, 2017 Posted March 29, 2017 Goodaye all Something to keep in mind with AC phase is that most houses have single phase, but 3 phases are available for 3 phase equipment. l we have 3 phase's at work and have on ocassions had a phase drop out, Lights do strange things and the UPS alarms are screaming, our record is 5 PC power supplies and 2 motherboards in one day. (l was busy that day) Yes they had surge protection that had failed. If you don't understand electricity don't fiddle with it. regards Bruce
andyr Posted March 29, 2017 Posted March 29, 2017 12 hours ago, crisis said: I know enough about electricity to electrocute myself so is this even a thing? As Dan commented, they are just protecting their butts and I suspect they just want to make sure that pin on the IEC socket is connected to 'Active' - so their fuse will be in the right place. However, it does make a sonic difference which way round the mains is connected - it's to do with parasitic capacitance on the power tranny's primary circuit - and whether Primare and Lavardin go to the effort of checking to see whether their power trannies are connected "the right way round" ... is a moot point! 12 hours ago, Sir Sanders Zingmore said: nah, don't think it makes a difference as long as live isn't connected to earth Actually, it does. A guy named Clark Johnsen (in the US) wrote a book about this - "The Wood Effect". Andy
Volunteer sir sanders zingmore Posted March 29, 2017 Volunteer Posted March 29, 2017 18 minutes ago, andyr said: However, it does make a sonic difference which way round the mains is connected - I couldn't hear it when I switched around on the Lavardin amp I was trialling
davewantsmoore Posted March 30, 2017 Posted March 30, 2017 2 hours ago, andyr said: A guy named Clark Johnsen (in the US) wrote a book about this - "The Wood Effect". Doesn't the wood effect refer to acoustic polarity (ie. the sound pressure waves which reach our ears). ... where as this thread is about AC mains polarity... which has no relationship to acoustic polarity (?!?) 1
andyr Posted March 30, 2017 Posted March 30, 2017 (edited) 2 hours ago, Sir Sanders Zingmore said: I couldn't hear it when I switched around on the Lavardin amp I was trialling So you said - I believe you, Trevor! There are several possible reasons why you didn't ... but I'm fascinated to know how you actually made the change? Given the IEC socket is shaped asymmetrically - and so are our wall-sockets - how did you get the wall socket's active going to Laverdin IEC socket neutral? (Me - I have a 300mm long extension cord which is wired in reverse ... so: not using it has the active side of the wall socket (assuming it is wired up correctly - not all are!) connected to the active pin on the IEC socket, and using it causes the wall socket neutral to be connected to the IEC active pin.) Andy Edited March 30, 2017 by andyr
andyr Posted March 30, 2017 Posted March 30, 2017 Just now, davewantsmoore said: Doesn't the wood effect refer to acoustic polarity (ie. the sound pressure waves which reach our ears). ... where as this thread is about AC mains polarity... which has no relationship to acoustic polarity (?!?) If you'd actually read the book, Dave, you wouldn't have made that post. Sure, Clark's big bugbear has always been "absolute polarity" - as you say, making sure the sound pressure waves from the speakers reach our ears in the same phase as they would if you were listening live. But he includes a discussion on AC polarity and says if you get this right ... it is so much easier to hear whether you have absolute polarity ... or reversed. Unfortunately, the trouble with that theory is ... recording engineers don't always make sure their mikes are connected up with absolute polarity! But it's why a phase reversal switch on your phono stage or preamp is such a great idea! I've never had one - but I can implement another stored setting in my miniDSP which reversal all phases, right? So I can choose for each piece of music whether I want to listen to it with absolute phase (as far as my system is concerned) or reversed. Andy
davewantsmoore Posted March 30, 2017 Posted March 30, 2017 18 minutes ago, andyr said: If you'd actually read the book, Dave, you wouldn't have made that post. Correct ... Thanks for answering my question.
Volunteer sir sanders zingmore Posted March 30, 2017 Volunteer Posted March 30, 2017 38 minutes ago, andyr said: but I'm fascinated to know how you actually made the change? The supplier gave me a cord that was wired "correctly" for the amp (ie reverse polarity to normal) I switched between it and my standard kettle cord
andyr Posted March 30, 2017 Posted March 30, 2017 1 minute ago, Sir Sanders Zingmore said: The supplier gave me a cord that was wired "correctly" for the amp (ie reverse polarity to normal) I switched between it and my standard kettle cord Aah, OK. (Providing of course that when he said 'it was wired correctly for the amp', the supplied power cord was in fact reverse-wired. Andy 1
aussievintage Posted March 30, 2017 Posted March 30, 2017 21 hours ago, Addicted to music said: Yes it is a thing.....All jokes aside... Safety comes first so don't F....k with it. Use an Australian approves IEC and nothing else. See diagram: The wiring colours on that diagram are old, and have been changed red, green, and black, is now, brown, blue, and green/yellow (striped)
Addicted to music Posted March 30, 2017 Posted March 30, 2017 (edited) 2 hours ago, aussievintage said: The wiring colours on that diagram are old, and have been changed red, green, and black, is now, brown, blue, and green/yellow (striped) Really? That diagram represents typical standard domestic electricals. You may want to look at your house wiring and report back. The last I looked, 2.5mm 4.00mm and 6.00mm is exactly what it is and current. The electricals are red for active, black for neutral and green/yellow stripped for ground. Edited: that's beside the point, the point in that post is don't reverse the mains active and neutral, they are not the same. Edited March 30, 2017 by Addicted to music 3
crisis Posted March 30, 2017 Author Posted March 30, 2017 Thankyou gentlemen. So the orientation of the Australian power outlets vis a vis which side the active is matches the diagram on the amp?
Addicted to music Posted March 30, 2017 Posted March 30, 2017 45 minutes ago, crisis said: Thankyou gentlemen. So the orientation of the Australian power outlets vis a vis which side the active is matches the diagram on the amp? 240V is referred as active, and is referred to "Live" on the IEC plug of the amp. So my question to you is which side is it from the diagram I provided?
Hergest Posted March 30, 2017 Posted March 30, 2017 (edited) Am I correct in thinking that some Luxman gear has a button to check mains phase? I'm sure I've seen it on the front panels or rear of some of their models. *edit. Here's one. Line Phase Sensor. Edited March 30, 2017 by Hergest
aussievintage Posted March 30, 2017 Posted March 30, 2017 10 hours ago, Addicted to music said: Really? That diagram represents typical standard domestic electricals. You may want to look at your house wiring and report back. Sorry, my fault, I saw the 3 pin plug and wrongly assumed the colours were for the electrical lead, not the house wiring.
Zaphod Beeblebrox Posted March 30, 2017 Posted March 30, 2017 Just now, Hergest said: Am I correct in thinking that some Luxman gear has a button to check mains phase? I'm sure I've seen it on the front panels or rear of some of their models. Not in any Australian model, as it is completely unnecessary. The ONLY time an active/neutral swap is of any significance, is with US model amplifiers. AFAIK, US products now use polarised mains plugs and no longer use a resistor from neutral to chassis. Such an arrangement would violate Australian wiring rules anyway. People: This is a storm in a tea-cup. It doesn't matter which way the amplifier is wired. AC doesn't care and neither should you. 5
trobbins Posted March 31, 2017 Posted March 31, 2017 17 hours ago, Addicted to music said: 240V is referred as active, and is referred to "Live" on the IEC plug of the amp. So my question to you is which side is it from the diagram I provided? Can you please correct your diagram - protective earth distribution won't come from the main neutral bar.
Addicted to music Posted March 31, 2017 Posted March 31, 2017 (edited) 5 hours ago, trobbins said: Can you please correct your diagram - protective earth distribution won't come from the main neutral bar. are you a qualify electrician? would it matter whether it's bolted to an earth bar? Edited March 31, 2017 by Addicted to music
powerav Posted March 31, 2017 Posted March 31, 2017 @Addicted to music looks like you've been looking at the Pionner N50A? good unit. I have one for sale
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