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Haha, fake choke!?

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LAN_403

Conundrum

Sat Oct 17 2009, 10:38AM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062

I have heard of something like this where high power LEDs (15,000 mcd white) are sold as 50,000 mcd. the problem is that your average ebayer can't tell easily what power his new parts are.

The main annoyance is that if you try and cheap out there's a good chance the "new" LEDs will be poor quality and fail very quickly due to inferior wire bonds.

(looks nervously at his 100W and 10W LEDs..)

GeordieBoy

Sat Oct 17 2009, 01:14PM

Registered Member #1232 Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881

My bet is that your PSU is either a development prototype that somehow got sold! Or, more likely, someone left the company before the design was complete and it was put into production anyway. Both of these things probably happen a lot more than companies would like to admit!

That length of wire running from the PCB to the choke and back is the sort of thing an engineer might do to work out the lead lengths required and check it all fits together before the actual choke is designed/sourced/delivered.

I@m not going to get drawn into the approvals debate, as it@s a big topic. Suffice to say that EMC is an important part of CE marking, and yes it should be taken seriously by manufacturers of domestic and industrial electronic devices.

-Richie,

doctor electrons

Sat Oct 17 2009, 02:42PM

Registered Member #2390 Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381

Herr Zapp! You wrote. I'm afraid that you may not have any awareness of what you are talking about.
However, you may have been a bit quick in coming to that conclusion. I DO UL inspections and have worked with UL for about 5 years. Been through about 1000 hrs of UL training. So we can just nullify that comment. As far as safety goes with these entities. You are right, its taken seriously. Seriously enough that fines and a lot of money is involved if you are caught bypassing their regulations. Such as ul508a for industrial control panels. Interestingly enough there ARE numerous things that are just ridiculous, for example, UL requires wireway fill to never exceed 50%. Well thats good, because it is physically impossible to do so. Round conductors stacked one on top of the other will never reach 50% of any given space. But if there is nothing else wrong with a panel that had catastrophic failure, you would get seriously fined for violating the wireway fill statute. Maby you could enlighten me on why UL does not cover intrinsic safety, I will give you a tip to start from, as long as the component is marked or recognized, they will allow it. Even if it has never been tested. The price for marking, listing, or being recognized is pretty high.
Look deeper into the subject, you will find some very contradictory things and cash driven motives! The national electric code is more about safety
than anything else. Though it does not apply to circuit boards and such. Thats why you see cobbed together parts like those capacitors and chokes.

mikeselectricstuff

Sat Oct 17 2009, 10:27PM

Registered Member #311 Joined: Sun Mar 12 2006, 08:28PM
Location:
Posts: 253

wrote ...
Maby you could enlighten me on why UL does not cover intrinsic safety

UL913?

doctor electrons

Sat Oct 17 2009, 11:01PM

Registered Member #2390 Joined: Sat Sept 26 2009, 02:04PM
Location: Milwaukee Wisconsin
Posts: 381

508a Control panel standards. Thats what i was stating. And i am not going to get into a battle. UL is based on making money, period.
I have worked with UL for a long time. All it takes is some thinking and looking at how it affects end product. If you dont see it, you wont see it.
But if you look, it's there in big neon lights. $$$ It's also a giant liability scam. Take the NEC or ANY UL standards, They are all worded very carefully to
lead you to your own interpretation of what the correct procedure is. However, that may not be correct. Clever wording to put you at fault when a product fails.

LutzH

Thu Oct 22 2009, 12:50AM

Registered Member #1721 Joined: Sat Sept 27 2008, 08:44PM
Location:
Posts: 136

Wow, I would tend to go with the winding machine error which seems the most plausable. Hey look at the bright side though at least it did not contain a crumpled up Chinese newspaper and some rocks, like the recent incident at Walmart when a customer opened their new "game boy" to find the box stuffed with an old Chinese newspaper and a few rocks!!! Last week as I unwrapped some rectifiers from Hong Kong I looked at the Chinese newspaper packing and thought mmmmm, then na better not do that :)

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