57John Posted December 25, 2019 Posted December 25, 2019 Researching replacement fuses for my system’s electrical supply. I am already using standard approved sheathed power cables from the sub board to the room. I wonder if if anyone has found any standards approved replacements of the fuse unit in their board? Here’s an internationally approved sample. As you know all such parts still have to be approved by a licensed authority to comply with Australian Standards. https://www.akikoaudio.com/en/products/570-05-akiko-audio-cylindric-fuse-cartridge-english Knowing that fuses make make a difference in components I figure this would make a similar difference.
Guest rmpfyf Posted December 25, 2019 Posted December 25, 2019 2 hours ago, 57John said: Researching replacement fuses for my system’s electrical supply. I am already using standard approved sheathed power cables from the sub board to the room. I wonder if if anyone has found any standards approved replacements of the fuse unit in their board? Here’s an internationally approved sample. As you know all such parts still have to be approved by a licensed authority to comply with Australian Standards. https://www.akikoaudio.com/en/products/570-05-akiko-audio-cylindric-f`use-cartridge-english Knowing that fuses make make a difference in components I figure this would make a similar difference. Unlikely, as AS/NZS 3000:2018 now requires all subcircuits to be protected by a 30mA RCD. https://www.hagerelectro.com.au/files/download/0/198823_1/0/ASNZS3000_BestPractices_FINAL_Web.pdf
57John Posted January 6, 2020 Author Posted January 6, 2020 Yes the note above was confirmed by my local sparky too.
Guest rmpfyf Posted January 6, 2020 Posted January 6, 2020 47 minutes ago, 57John said: Yes the note above was confirmed by my local sparky too. You can do funky things with wiring though... plenty of scope to do interesting things. Earthing's worth a look. And really... you don't want to mess with protection It's an area where our standards are particularly good IMHO.
Bunno77 Posted January 6, 2020 Posted January 6, 2020 2 minutes ago, rmpfyf said: You can do funky things with wiring though... plenty of scope to do interesting things. Earthing's worth a look. And really... you don't want to mess with protection It's an area where our standards are particularly good IMHO. Earthing being the most important protection
57John Posted January 6, 2020 Author Posted January 6, 2020 Yeah so far I’ve upgraded the wire from the sub board to the HT to fully shielded higher current format. Still in the wiring stage at this time.
Guest rmpfyf Posted January 6, 2020 Posted January 6, 2020 11 minutes ago, Bunno77 said: Earthing being the most important protection Indeed. Though there's scope to go more direct/additional/capacity/etc with it within standards (ie whilst keeping it safe) 10 minutes ago, 57John said: Yeah so far I’ve upgraded the wire from the sub board to the HT to fully shielded higher current format. Still in the wiring stage at this time. Is that flex to code?
57John Posted January 6, 2020 Author Posted January 6, 2020 Just now, rmpfyf said: Indeed. Though there's scope to go more direct/additional/capacity/etc with it within standards (ie whilst keeping it safe) Is that flex to code? Yes it is. lol I bought a better armorclad set from the USA and promptly sent it back before identifying this commercial grade supplier here, Treotham http://www.treotham.com.au/ 1
Bunno77 Posted January 6, 2020 Posted January 6, 2020 4 minutes ago, rmpfyf said: Indeed. Though there's scope to go more direct/additional/capacity/etc with it within standards (ie whilst keeping it safe) Very true. Have seen some wild earthing systems for audio abroad though 4 minutes ago, rmpfyf said: Is that flex to code? Obv can't tell but looks like stuff I have installed before
aussievintage Posted January 6, 2020 Posted January 6, 2020 23 minutes ago, rmpfyf said: Earthing's worth a look. Check out the clean earthing recommendations for large process control computer systems. They are dealing with small signals in a particularly dirty environment. Honeywell, for example, should have some good design recommendations still. 1
57John Posted January 6, 2020 Author Posted January 6, 2020 See here for datasheet https://direct.dksh.com.au/files/product_docs/Y-CY-JB.pdf
57John Posted January 6, 2020 Author Posted January 6, 2020 Of course I wish it was 100% “Tinned copper braided screen, approx. 85% coverage” but it was the best I could find at the time
aussievintage Posted January 6, 2020 Posted January 6, 2020 3 minutes ago, 57John said: Of course I wish it was 100% “Tinned copper braided screen, approx. 85% coverage” but it was the best I could find at the time Doesn't have to be 100%. That's why they can have holes in microwave door screens to let you watch your food being ruined
57John Posted January 6, 2020 Author Posted January 6, 2020 Just now, aussievintage said: Doesn't have to be 100%. That's why they can have holes in microwave door screens to let you watch your food being ruined Hahahaha I assume better coverage equals better attenuation of stray EMI RFI
aussievintage Posted January 6, 2020 Posted January 6, 2020 3 minutes ago, 57John said: Hahahaha I assume better coverage equals better attenuation of stray EMI RFI No, just the size of the holes determines the frequency that can get through.
57John Posted January 6, 2020 Author Posted January 6, 2020 3 minutes ago, aussievintage said: No, just the size of the holes determines the frequency that can get through. Where did you build your knowledge in this field? Have you ever looked at this work? https://upgradecompany.com/?fbclid=IwAR3mI6GvodVD4lN4L93fL9Kz-SzvbkTuEsGSN_5b4dxrAA8dpo996i7MUG4
aussievintage Posted January 6, 2020 Posted January 6, 2020 2 minutes ago, 57John said: Where did you build your knowledge in this field? Have you ever looked at this work? https://upgradecompany.com/?fbclid=IwAR3mI6GvodVD4lN4L93fL9Kz-SzvbkTuEsGSN_5b4dxrAA8dpo996i7MUG4 I haven't read that before but I see they are saying the same thing basically Quote RF wavelengths are so short especially at the 2.4Ghz wavelength of cell tower/ cell phone/home phones/WiFi use, they go thru slots, gaps, and holes in underside The high frequency, short wavelengths, can pass through the holes. Smaller holes mean the frequencies need to be higher.
57John Posted January 6, 2020 Author Posted January 6, 2020 10 minutes ago, aussievintage said: I haven't read that before but I see they are saying the same thing basically The high frequency, short wavelengths, can pass through the holes. Smaller holes mean the frequencies need to be higher. So the 85% coverage in this cable is inconsequential for household 2.5/5GHz radiation.
aussievintage Posted January 6, 2020 Posted January 6, 2020 41 minutes ago, 57John said: So the 85% coverage in this cable is inconsequential for household 2.5/5GHz radiation. I suspect so. I believe microwave ovens work at 2.45 GHz. Look at the size of the holes in the oven door screen. As long as the shielding on the cable has much smaller gaps, I figure it will eliminate most of the problems.
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