Questions tagged [standard]

For questions about technical standards such as IEEE standards. Examples of such questions include: what a standard requires, how to meet the requirements of a standard in a circuit design, what capabilities and limitations a circuit designer can assume when incorporating a standards-compliant component in a design, etc.

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Creepage between layers on a PCB

I'm currently designing a power supply with high isolation between primary and secondary sides and have to comply to standard distances on clearance and creepage. My question is regarding creepage, I ...
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1 vote
0 answers
36 views

How do I determine the acceptable delay spread in an analog FM simulcast LMR system?

I'm using a commercial propagation analysis software to analyze a legacy VHF simulcast Land Mobile Radio (LMR) system. I'm trying to analyze the parameter "Delay Spread". The software ...
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2 votes
2 answers
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AWG and metric markings on wire differ notably

I have been looking at "Tri-rated wire". This is wire that ostensibly meets the British BS6231 Type CK, US UL 758 Style 1015, and Canadian CSA 22.2. I have noticed that the metric wire size (...
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1 vote
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LTE PC5 Subframe Structure

LTE provides sidelink communication via the PC5 interface. According to the "secondary literature" [1],[2],[3], the PC5 subframe is structured as follows: Symbol 0,1,3,4,6,7,9,10,12: PSCCH, ...
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1 vote
1 answer
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ISO/IEC Power/Ground Symbol in schematics?

Yet again, we are debating with colleagues to choose the correct power symbols in our schematics. Some argue that using the horizontal 4-lines symbol for GND is a misunderstanding because this is not ...
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2 answers
155 views

How unsafe is 220V over NEMA 5-15 really?

I'm from the Philippines but the U.S. had a very large influence on our electrical standards. It is especially evident on our electrical sockets. While all of the sockets in a typical Filipino home ...
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-3 votes
1 answer
88 views

12V-only (and no 110V/220V) household electrical installation [closed]

Power outlets are in 220V/110V in houses for historical reasons (light bulbs and other appliances probably required >100V voltage) but nowadays as: we use a USB charger 220V->5V for phones, ...
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1 answer
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Interface a CML device with FPGA

I want to interface an IC with an FPGA however I noticed that the datasheet says the digital control inputs are differential and CML standard based. Can someone please guide how to interface this if I ...
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33 views

Are There Any Standards for RTCs, Similar to JC42 Temp Sensors?

When I place a temperature sensor on a board, I like to use a JC42-compliant temperature sensor. I know of at least half a dozen manufacturers that build these temperature sensors in exactly the same ...
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2 votes
2 answers
66 views

Standard for batteries in emergency lights

I am not sure if this question fits this community. I would like to know if there is any norm or standard for batteries in emergency lights for rail purposes in European countries, for example, some ...
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2 votes
0 answers
82 views

Is there a standard PoE+ input symbol for a product label?

I was expecting to easily find this. However, unlike other safety symbols (such as double insulation / Class 2) I cannot seem to find a lead. Was convinced this would fall under some sort of safety as ...
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If a device's electrical requirements give a voltage range and fixed current, does the current limit assume the lowest input voltage? [duplicate]

I am working with some small devices and checking input power requirements. Many of the standard labels look like this: Input Power: 100 - 240 VAC, 50-60Hz, 2.5A I am trying to determine how much ...
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0 votes
1 answer
42 views

Does the standard for M12 A-Coded 4-pin plugs (female) have a dummy center hole to accommodate 5-pin socket (male) connectors?

I have a project that will tap into an existing sensor that uses a 4-pin M12 A-Coded connector. My plan is to use a Y Splitter to allow me to tap a parallel connection to the sensor. The splitter I ...
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-1 votes
2 answers
192 views

Can I use this US extension cord in Europe? [closed]

Long story short: I need an extension cord to charge my EV when the standard charger does not reach the socket. I spent hours researching what options I have and most review websites I found were US-...
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0 votes
0 answers
96 views

How is TCF calculated for a Current Transformer?

I'm trying to understand the IEEE C57.13 standards for current transformer metering accuracy, and I don't understand how the Transformer Correction Factor (TCF) is defined for current transformers. ...
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2 votes
1 answer
86 views

How to choose the right flexible cable for moving parts?

Is there a generally accepted guide to select a cable, which has to withstand certain bending stress? I am looking for something like this: ...
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0 votes
0 answers
31 views

Uncertainty regarding EU regulation for switching devices

Our company is working on developing an AC electric car charger for the EU market. One part of the design process is choosing a suitable relay for this application. In the standards it is required ...
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0 votes
4 answers
132 views

Rs485 A & B Labels being used inconsistently

I would like to know if there is an official standard with regards to rs-485 terminals being labelled A & B. I have always believed: A=> + (positive) and B=> - (negative) however, I have ...
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0 votes
1 answer
83 views

Electromagnetic compatibility (EMC) standard

I have been working on a battery fast charger of around 500W. I have been wondering if active power factor correction (PFC) is necessary and have seen people mention a European standard EN 61000-3-2. ...
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Transformer secondary conductor protection: how do NEC 240.21(C) and NEC 240.4(B) make sense together?

NEC 240.21 says all ungrounded circuit conductors require overcurrent protection, with a list of exceptions: One of those exceptions is 240.21(C): 240.4(B) says that if you're under 800 amps, you ...
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1 vote
1 answer
89 views

Must the device I am developing conform with IEC 61010-1:2010 standard?

I am developing a device that contains 5 inputs (piezo buttons) and 5 outputs (2x pump - induction motor, fan - induction motor with basic speed control using dimmer circuit, 2x source for LED ...
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2 votes
2 answers
132 views

What are the standards for hand placing components?

Is there any written specification for the orientation of components on a manually assembled PCB, including both THT and SMT passive components? 'Manually' because machines can be easily setup to ...
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1 vote
0 answers
62 views

What is the proper reference designator for a ring terminal in a cable drawing?

I am working on some cable drawings that utilizes ring terminals that connect on a relay terminal. Initially, I was using T as the reference designator for them, but I realized that is incorrect since ...
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1 vote
0 answers
88 views

What happened to the M2.com standard?

I just discovered some news articles from 2016 announcing an IoT standard called "M2.com", with quite a few big names supporting it. It was basically meant to be a standard pinout for the M2 ...
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0 votes
3 answers
195 views

Is there a "standard connector" for SPI, in a similar way to the "standard Qwiic connector" for I2C?

I really love the "standard Qwiic connector" initially intoduced by Sparkfun for connecting / "chaining" I2C components. Really amazing and super convenient in day to day life when ...
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  • 243
1 vote
0 answers
71 views

Is there a published standard for 'euro modules'?

Variously called 'Euro modules', 'Euromods', 'Euro modular', these are 'standard' sized units (1U, 2U, ..) that slot into face plates - e.g. a 1-gang face plate can take 2U; 2-gang fits 4U - that can ...
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  • 258
1 vote
3 answers
67 views

Is there a resource to look up widely in-use/standard connector styles?

I'm working on rebuilding a design that currently uses obsolete parts. I'm taking the opportunity to increase reading accuracy. In doing so, I will have to replace our current connector to go from a 2 ...
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0 votes
0 answers
29 views

Thermal resistance and JECED standards

Looking at the STCS1A datasheet I read: ...
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1 answer
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Which UL standard(s) holds the specifications of all UL AWM styles of cabling?

Which UL standard documents the specifications of all UL AWM styles of cabling, detailing their construction, conductor sizes, insulation, etc. ? In my research, I was directed to UL Standard 758 ...
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  • 101
0 votes
1 answer
159 views

Wire color standards for a reversible DC motor [closed]

I'm working on a project with a DC motor that runs in both directions. If the motor ran only in one direction, I'd use red/black for positive and ground, but as they reverse, there isn't a consistent ...
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0 votes
2 answers
77 views

Square wave, triangle wave etc. not defined in International Electrotechnical Vocabulary (IEV.) Are they not standard terminology?

Why are there no definitions for typical terms like square wave, triangle wave etc. in the International Electrotechnical Vocabulary (IEV)? Are these widely used descriptions not defined by ...
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1 vote
1 answer
205 views

Is a VL3030 coin cell battery a suitable replacement for a ML2430

Hi i am attempting to replace a battery in my electronic compass and im supposed to use an ML2430 however this is proving to be hard to get hold of and expensive. Im concidering using a VL 3032/HF5N ...
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0 votes
0 answers
36 views

Is there a standard equivalent to automotive standard AEC-Q200 for the medical sector?

I want to ensure components of high integrity characteristics are utilised in a design by a third party. In the automotive sector AEC-Q200 can be stipulated, e.g. (https://www.digikey.com/en/product-...
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0 votes
1 answer
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Is there an international standard on the frequencies used by car toll tags?

We're finding that when we drive through a car-toll collection point, our Car-Pay Wifi connection cuts out. (Music and maps cut out). I'm guessing that the Car-toll tag system uses the same ...
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  • 627
-1 votes
2 answers
105 views

What standard must a component/ device comply with to be industrial grade?

I am looking at an iot device that claims to be industrial grade. It meets standards such as UL60950-1 and has an operating temperature -40 --> 85C so looks good but is that enough? Exactly what ...
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1 vote
0 answers
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Are there standardized values for the turn ratio of transformers?

I am simulating a dc battery charger. The circuit contains a step down transformer I will need to lower the tension from 311 V (Vp) (or 220 RMS) to 15 V (Vp). One possible option for the turn ratio ...
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  • 201
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0 answers
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IEC grounding and bonding standard

Is there an equivalent standard in IEC such as UL 467 or IEEE 837 which talks about the various test procedure for bonding clamps? Is IEC 61914:2015 similar to UL 467?
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0 votes
1 answer
115 views

UL 1971: is there a tolerance on strobe flash rates?

UL 1971 27.1.3(a) requires that listed strobes used for fire alarm signaling to hearing-impaired occupants flash at between 1 and 2 flashes per second: a) Signaling lights shall produce a candela ...
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1 vote
0 answers
39 views

Is putting a board inside an anti-static enclosure enough to make it Ex ib ready?

A year ago, we made a handheld PDA based on RPi0 for a client. Now they have asked us to certificate it as Ex ib IIC T4. Here is the PDA's spec: RPi0 as processing board 4.3" capcitive LCD A ...
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123 views

ETSI Definition of "Channelized system"

ETSI standards EN 301 489-1 and EN 300 330 use the term "channelized" (system or equipment). But I could not find any definition for "channelized" in one of the standards or any ...
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  • 101
1 vote
1 answer
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What's the minimum equipment rating required to perform testing in production environment? [closed]

I would like to purchase a Power supply to test my unit in production environment. The power supply is expected to support a production yield of 1 Million units per year. As per one of the test ...
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Grounding standard for mechanical/crimping connector

Can anyone tell me if there is a grounding standard that takes about mechanical/crimping connectors, I am looking for an IEC standard. I cam across IEC 61238-1 but this talks about power cables, are ...
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2 votes
2 answers
585 views

Are pins supposed to have the same thickness by some standard?

I bought a DHT-22 temperature sensor, some other sensors, and some jumper cables. The cable and the pins on other sensors and a Raspberry Pi fitted well, but the pins on DHT-22 seem thinner. The ...
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2 votes
3 answers
276 views

Name of UART standard, if any

my question simply is to know where is the origin of UART system. Is there any standard covering it. I can only see similar question here but the only answer is saying Wikipedia !!! I can see many ...
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1 vote
1 answer
31 views

61000-3-2 Pre-compliance harmonics

I am wondering about 61000-3-2 current harmonics pre-compliance test. Say a company designs a single-phase [up to 13A] power converter for low-line 115V and high-line 230V and pass 61000-3-2 pre-...
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5 votes
2 answers
854 views

If there is a cable and jack standard for I2C?

I want to do a connection of multiple current and voltage meters, they connect by I2C. Is for to monitor solar panels and batteries, they will be a considerable distance from the master. I thinking ...
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1 vote
1 answer
55 views

Understanding cable standards for low voltage conductors in high voltage environments

I am currently getting some custom cables made and having a serious communication issue with several cable manufacturers. I want several low voltage (5V DC) insulated conductors in a jacket that can ...
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  • 319
0 votes
1 answer
457 views

VPX Radial Clock Vs Bussed Clock

I'm learning some concepts about OpenVPX. One thing I am a bit confused about is the notion of a radial clock versus a bussed clock. I'm not getting many helpful google hits. Can someone explain the ...
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0 votes
2 answers
234 views

Firmware coding - applicable standards

I would like to know if there are any applicable standards when coding microcontroller firmware (ARM) in order to achieve a specific quality level. In my case, I would like to code firmware for a ...
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0 votes
1 answer
44 views

How to discretize value like EDF ( or other electricity companie )

I make a solution using some automate like : A9MEM2050 ( Shneider ) ( and more advanced, so i have a lot a different value , that include rpm, psi, armonic, etc ...) Every automate send a value every ...
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