Author Topic: ?  (Read 2815 times)

0 Members and 1 Guest are viewing this topic.

Offline Nioonmo

  • Newbie
  • Posts: 1
  • Country: it
?
« on: October 21, 2018, 03:38:44 pm »
?
« Last Edit: May 30, 2019, 12:21:30 pm by Nioonmo »
 

Offline awallin

  • Frequent Contributor
  • **
  • Posts: 594
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?
 

Offline dunkemhigh

  • Super Contributor
  • ***
  • Posts: 1492
Quote
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.
 

Online 2N3055

  • Super Contributor
  • ***
  • Posts: 2124
  • Country: hr
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...
« Last Edit: October 22, 2018, 09:31:34 am by 2N3055 »
 
The following users thanked this post: Cyberdragon, julianhigginson

Offline julianhigginson

  • Frequent Contributor
  • **
  • Posts: 708
  • Country: au
Yikes! What safety compliance testing have you done?
 

Offline julianhigginson

  • Frequent Contributor
  • **
  • Posts: 708
  • Country: au
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.
 

Online 2N3055

  • Super Contributor
  • ***
  • Posts: 2124
  • Country: hr
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/

That should get you started.
 
The following users thanked this post: Richard Crowley

Offline timgiles

  • Regular Contributor
  • *
  • Posts: 237
  • Country: se
  • Programmer, DB architect
Its refreshing to have a group of EEs asking for advice and taking the time to process that advice :-)
 

Online Cyberdragon

  • Super Contributor
  • ***
  • Posts: 2134
  • Country: us
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/

You also have to get your CE certification.

https://europa.eu/youreurope/business/product/ce-mark/index_en.htm
*BZZZZZZAAAAAP*
Voltamort strikes again!
Explodingus - someone who frequently causes accidental explosions
 

Offline Bassman59

  • Super Contributor
  • ***
  • Posts: 1291
  • Country: us
  • Yes, I do this for a living
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.
 

Offline Mr. Scram

  • Super Contributor
  • ***
  • Posts: 8154
  • Country: 00
  • Display aficionado
Re: E.box a completely new All-in-One test instrument now available on Tindie
« Reply #10 on: October 23, 2018, 07:26:40 pm »
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.
 

Online 2N3055

  • Super Contributor
  • ***
  • Posts: 2124
  • Country: hr
Re: E.box a completely new All-in-One test instrument now available on Tindie
« Reply #11 on: October 23, 2018, 08:13:13 pm »
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.
 

Offline Mr. Scram

  • Super Contributor
  • ***
  • Posts: 8154
  • Country: 00
  • Display aficionado
Re: E.box a completely new All-in-One test instrument now available on Tindie
« Reply #12 on: October 23, 2018, 10:37:17 pm »
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.
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf