20 votes
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Electronics System Standards Compliance: Certification, Testing & Verification

I can only answer this question from my point of view, so I am doing so to start the conversation, not because I expect this to be an exemplary response! EDIT: there is a VERY good ESE answer here ...
stefandz's user avatar
  • 4,152
9 votes
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Why are switchgears rated in specific capacities such as 63A, 100A, 125A and so on?

The fuses and switches you see follow the R10 Renard series. This series of 10 numbers (1.00, 1.25, 1.60, 2.00, 2.50, 3.15, 4.00, 5.00, 6.30, 8.00), for each order of magnitude, provides an ...
Matt S's user avatar
  • 3,512
8 votes

Electronics System Standards Compliance: Certification, Testing & Verification

The answer to the question depends on where in the world you are located. Let us for discussion's sake assume Europe. The rest of the world seems to be accepting or even adapting to the European ...
Lundin's user avatar
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7 votes

What is this mains blade connector called?

That is a NEMA 1-15P. The connections internal to that device are probably custom -- connectors are something that are easy enough to make that for volume manufacture you'll often see partial or full ...
TimWescott's user avatar
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7 votes

Does recommended creepage distance apply to copper planes under soldermasks?

TL;DR Does recommended creepage distance apply to copper planes under soldermasks? Yes, it does. Solder mask does not change the required creepage distance on a circuit board. Is Solder Mask an ...
比尔盖子's user avatar
  • 7,030
6 votes

Electronics System Standards Compliance: Certification, Testing & Verification

From someone actually having done some serious work on the certification business of a medical device. Others already wrote at great length so I'll just add some other points. 1st, you cannot know ...
Barleyman's user avatar
  • 3,656
6 votes

What is this mains blade connector called?

Usually connectors like that are custom sheet metal (a, that are stamped and bent. You could find a sheet metal shop and ask them how they are made. (you could probably unsolder them and give them to ...
Voltage Spike's user avatar
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5 votes
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IEC vs. UL current rating

Just because it was not tested to that standard does not mean it won't safely operate at that current. They may not bother testing above 10A, for example, because 10A is a lot of power at 230VAC. Or ...
Spehro Pefhany's user avatar
5 votes
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USB power pack in wearable electronics: Is it safe?

Manufacturer is: TWINTECH INDUSTRY INC 16420 MANNING WAY CERRITOS, CA 90703 USA UL File Number: MH60879 Model: 2706UL RetroFIT 1500P This unit was certified UL 2054 compliant UL 2054 checks ...
Misunderstood's user avatar
4 votes
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Circuit Testing, Verification & Certification Standards for Biomedical Devices

There is nothing wrong in using open source software or hardware to design medical devices. But at end of the day provider of these equipment has to comply with regulation in jurisdiction the devices ...
Mahendra Gunawardena's user avatar
4 votes

What is the general rule of thumb regarding UL's creepage clearance regulation?

The important thing to remember about this sort of things is that these are ratings. Ratings are about safety in the edge cases of a big mains spike and heavy board contamination and high humidity and ...
Neil_UK's user avatar
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4 votes

Why are switchgears rated in specific capacities such as 63A, 100A, 125A and so on?

I am mostly answering from a US perspective: The ratings of fuses and non-adjustable circuit breakers are defined in the National Electrical Code: These are very roughly a geometric series (though ...
Theodore's user avatar
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3 votes

Creepage distance over pcb

How to measure creepage distance over pcb ? Is creepage and clearance distance measure by pbc layout or soldering? This might help: - Picture from this site.
Andy aka's user avatar
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3 votes

Compliance Testing Strategies

You're definitely on the right track with: I tested the product in these configurations, and they represent a superset of all possible configurations, and they all met the regulatory standards; ...
Jim's user avatar
  • 1,657
3 votes
Accepted

What cable standard is needed for UL94V-0 device

In IEC 61010, the requirement is Insulated wires and cables shall retard flame propagation. NOTE 2 Wire with a flammability RATING of UL 2556 VW-1 or equivalent is considered to meet this ...
The Photon's user avatar
  • 130k
2 votes

How to know or find if a potentiometer is UL certified

I contacted a mean well engineer for this issue and his response was "The potentiometer does not require to have UL cert because the PWM-60-12 CofA does not require. " Datasheet - http://www....
tooclosetosee's user avatar
2 votes

How to know or find if a potentiometer is UL certified

Not every component needs to be recognized. The power supply as a whole will be listed / recognized. It's up to the evaluation to the appropriate standard to determine if the component is critical. ...
Spoon's user avatar
  • 1,292
2 votes

Circuit Testing, Verification & Certification Standards for Biomedical Devices

This question is more legal than engineering one, and I'm not a lawyer. However, my understanding is that a medical device is a function, not a technological capability. If the device is used to ...
Dmitry Grigoryev's user avatar
2 votes

UL/IEC-60950 Standard Question

These have nothing to do with one another. You don't learn anything regarding meeting 60950 from their claims. ISO9001 has to do with internal quality management, and IPC-A-610 has to do with ...
Jim's user avatar
  • 1,657
2 votes

How to deal with non UL DCDC converters?

we need to ship ASAP ... What am I missing here? Someone that understands the certification process. If you had such a person, they would have been involved from the start, and not allowed you to ...
Olin Lathrop's user avatar
2 votes

Electric Tester light up on secondary side of Ground

First, 250 µA AC is (just) perceptible to touch, though not as a shock, but usually perceived as a vibration or tingle. It is also enough to light a neon lamp, if that is the tester you used. That ...
DrMoishe Pippik's user avatar
2 votes
Accepted

Finding manufacturer of product based on certifications

This sticker is fake and they are not actually certified. This is actually quite common these days. I have bought a few power supplies with fake ETL tags, many items from china do. It is expensive to ...
Voltage Spike's user avatar
  • 82.6k
2 votes

Finding manufacturer of product based on certifications

The actual company is called Getrom. To find the model replace the wf with JDL in the model number. They actually do have ETL certifications, but this Warmford company is made up. getrom.com.cn
David's user avatar
  • 21
2 votes

Why are switchgears rated in specific capacities such as 63A, 100A, 125A and so on?

Intersection of preferred numbers, as some have said already. When the circuit breaker will trip is based on the amount of overcurrent, how long the overcurrent condition has existed, the design of ...
vir's user avatar
  • 18.4k
2 votes
Accepted

When does UL allow a user to access the a metal component connected to AC MAINS through a Y capacitor?

Under what conditions does UL require that exposed metal on a consumer device be grounded? Switching supplies typically connect a Y cap between primary and secondary and my ETL listed space heater has ...
Voltage Spike's user avatar
  • 82.6k

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