? - Page 1
Forum section: electronics / general

author: Nioonmo
author_rank: Newbie
timestamp: October 21, 2018, 03:38:44 pm
content: ?

author: awallin
author_rank: Frequent Contributor
timestamp: October 21, 2018, 04:13:22 pm
content: with euro-plugs that plug in two ways you can't be sure which is L and which is N. Isn't that a good motivation for breaking both L and N (but not PE) when you want to switch things off?

author: PlainName
author_rank: Super Contributor
timestamp: October 22, 2018, 12:48:32 am
content: QuoteA mains controller with built-in multimeter? That's not really a simple device - when or why would I want to use it? I have mains controllers that control mains well. I have (too many) multimeters that do multimetering very well. I can't envision a situation where it would be worth the time to take this out of its box for those features.It sounds to me like you've made some mains monitoring thing and figured that the bit that measures the waveform could also be tapped into to provide low voltage input too, so you've added that because you could. But in doing so I think you are confusing the message of what this device is really about.I would suggest that you forget the multimeter stuff. Sure, leave it in and it's a nice surprised to a purchaser, but that's all it is and shouldn't appear in the blurb. Making it a feature detracts from the more unusual features that are what will sell this. Concentrate instead on the mains waveform and power monitoring, and the relay stuff is a sub-feature of those.

author: 2N3055
author_rank: Super Contributor
timestamp: October 22, 2018, 09:12:51 am
content: Not a single word mentioning safety standards. Not a single one. It is something connected to mains, and human operated equipment.Something you would have connected to mains for days, increasing statistical probability it would be exposed to over-voltage spikes..I would be very cautious...

author: julianhigginson
author_rank: Frequent Contributor
timestamp: October 22, 2018, 09:24:43 am
content: Yikes! What safety compliance testing have you done?

author: julianhigginson
author_rank: Frequent Contributor
timestamp: October 23, 2018, 05:45:39 am
content: Quote from: Nioonmo on October 22, 2018, 10:01:51 amthat answer is actually worse than the initial lack of info about electrical safety standard compliance in the first place.

author: 2N3055
author_rank: Super Contributor
timestamp: October 23, 2018, 08:28:57 am
content: Quote from: Nioonmo on October 23, 2018, 08:13:37 amThat is an honest answer. That is good.Please look here :http://www.ni.com/white-paper/2827/en/That should get you started.

author: timgiles
author_rank: Regular Contributor
timestamp: October 23, 2018, 01:05:22 pm
content: Its refreshing to have a group of EEs asking for advice and taking the time to process that advice :-)

author: Cyberdragon
author_rank: Super Contributor
timestamp: October 23, 2018, 02:58:23 pm
content: Quote from: Nioonmo on October 23, 2018, 11:51:18 amYou still have to get the device certified. Unless you are qualified for in-house certification, you have to actually send the device to their testing labs to be certified.https://www.ul.com/customer-resources/preparing-for-your-ul-mark-evaluation/You also have to get your CE certification.https://europa.eu/youreurope/business/product/ce-mark/index_en.htm

author: Bassman59
author_rank: Super Contributor
timestamp: October 23, 2018, 07:20:35 pm
content: Quote from: Nioonmo on October 23, 2018, 05:02:21 pmThe lawyer who sues you for wrongful death doesn't care whether you are a company or a group of students, nor does he care whether the product was sold through standard retail channels or through Tindie.

author: Mr. Scram
author_rank: Super Contributor
timestamp: October 23, 2018, 07:26:40 pm
content: Quote from: Bassman59 on October 23, 2018, 07:20:35 pmWhile true, the ability to show you did due diligence should make a relevant difference. The CE certification can be self certified in a lot of cases.

author: 2N3055
author_rank: Super Contributor
timestamp: October 23, 2018, 08:13:13 pm
content: Quote from: Mr. Scram on October 23, 2018, 07:26:40 pmThis..But you do have to do the process, do it according to ALL applicable standards, have technical file and all diligently documented.In which case you can self certify. Unless one of the standards stipulate that some measurements have to be done by certified lab.It's not easy.

author: Mr. Scram
author_rank: Super Contributor
timestamp: October 23, 2018, 10:37:17 pm
content: Quote from: 2N3055 on October 23, 2018, 08:13:13 pmI suspect that a lot of products wouldn't make the cut if you'd look hard enough, but that's a different discussion.