EEVblog Electronics Community Forum
Products => Crowd Funded Projects => Topic started by: Nioonmo on October 21, 2018, 03:38:44 pm
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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?
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Our goal is to create a simple, reliable and easy to use device
A 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.
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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...
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Yikes! What safety compliance testing have you done?
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Thank you for asking this, sorry if we didn’t write anything about this topic.
E.box is rated for 2400V 50A overload for a few seconds.
Insulation is rated for 800V continuous, 5kV for 1 minute.
that answer is actually worse than the initial lack of info about electrical safety standard compliance in the first place.
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We don't understand why you don't like the specified ratings.
Every E.box is tested with high current transformers (up to 50A) and high voltage transformers (up to 2kV).
From these data you can understand that E.box tolerates larger overloads than the overload immunity of most of the domestic appliances that are plugged in 24/7 like power supplies and chargers.
E.box is our first product, we are not a company, we are a team of young electronic designers.
We wrote in this forum to receive advice on how to improve E.box. We can respond to your questions, just tell us what you want to know precisely.
That is an honest answer. That is good.
Please look here :
http://www.ni.com/white-paper/2827/en/ (http://www.ni.com/white-paper/2827/en/)
That should get you started.
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Its refreshing to have a group of EEs asking for advice and taking the time to process that advice :-)
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Thank you for your advice.
We are now performing more overvoltage tests in our lab to better understand E.box transient immunity
You 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/ (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 (https://europa.eu/youreurope/business/product/ce-mark/index_en.htm)
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We think that only companies have the possibility to obtain this type of certification.
As we wrote above, we are a group of students not a company.
This is why our product is only available on Tindie (a store for hobbyists) in limited quantities, we do not do it for business and we are not interested in mass production.
The 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.
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The 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.
While 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.
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The 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.
While 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.
This..
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.
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This..
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.
I suspect that a lot of products wouldn't make the cut if you'd look hard enough, but that's a different discussion.