Questions tagged [standard]

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28 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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0answers
90 views

Is there a color standard for LEDs according to the activity? [closed]

I am working on a battery-operated device and I wanted to know if there is any standard that indicates the color to choose according to the activity, example: Red - error, blue - pairing- amber - ...
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2answers
124 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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0answers
40 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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0answers
50 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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0answers
28 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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4answers
79 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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1answer
72 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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0answers
54 views

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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1answer
73 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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2answers
121 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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0answers
40 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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0answers
83 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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3answers
127 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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0answers
50 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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0answers
12 views

Do we need to define the delay, power and constraint templates for characterising a library (.lib) file out of post-layout netlists (transistor level)

I am designing standard cells at the transistor level and I want the characterize these cells into a library file (.lib). Do I need to define the delay, power and constraint templates (sequential) ...
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0answers
21 views

Compatibility of trace/conductor clearance standards and SOTA IC packages

this is one of those questions where one has to pay special attention phrasing it to not get SO-bashed for not being specific enough. However, apart from getting some answers to specific aspects ...
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3answers
66 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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0answers
29 views

Thermal resistance and JECED standards

Looking at the STCS1A datasheet I read: ...
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1answer
29 views

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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1answer
114 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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2answers
76 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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1answer
170 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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0answers
24 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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1answer
47 views

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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2answers
89 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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0answers
47 views

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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0answers
37 views

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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1answer
64 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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0answers
36 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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0answers
83 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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1answer
40 views

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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0answers
23 views

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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2answers
570 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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3answers
208 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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1answer
29 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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2answers
806 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 ...
1
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1answer
52 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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1answer
323 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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2answers
158 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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1answer
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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2answers
44 views

Standard dimension for Li ion batteries

I wonder why is there no standard for Lithium ion batteries especially for portable devices,we can easily have a standard dimension/fit for similar capacities and power rating imposed by IEEE or ...
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0answers
47 views

Why is there a discrepancy in the E192 series? [duplicate]

For all series from E48 through E192, this holds true: $$ value = 10^{\frac i n} $$ where i is the zero-based index in the series and n is the length of the series. The one exception is E192[185]: $...
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2answers
570 views

Medical electronic devices quality

Is there a special grade for electronic components made to be used in medical devices such as life support systems? I have read in most data sheets that "this product is not to be used in life support ...
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0answers
204 views

Is there a standard for this "outdoor light systems connector"?

I have a strand of LED Christmas lights I'd like to control with an ESP8266. It has a two-pin DC connector that attaches to a wall-wart adapter so ideally I would keep both and insert the ESP8266 ...
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1answer
81 views

Using MIL-DTL-38999 circular connector for Ethernet applications

A MIL-DTL-38999 connector based on insert arrangement has a different service rating (M, N, I and II). Service rating of M shows a suggested operating voltage of 500VDC (pin to pin and pin to shell). ...
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1answer
83 views

How in-depth is the IPC "Introduction to Printed Circuit Design" course?

I'm looking into courses to progress from autodidactic hobby-level PCB design. IPC is offering an "Introduction to PCB design" course. How well does the course cover the standards? IPC-222x, IPC-7x51,...
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2answers
2k views

NEC Ampacities Data

This data shows the Allowable Ampacities of Insulated Conductors Rated 0 to 2000V, for Copper conductors, as listed in the NEC NFPA 70E Table 310.16, used for estimating the current ratings for power ...
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4answers
3k views

What's the difference between these diode symbols?

What's the difference between these three different ways of symbolising a generic rectifier diode: solid, outline and outline with connection between anode and cathode?
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2answers
437 views

Misra C or other code standard compliance in TI CCS

If I need to do Static Code analysis of my code or check for Misra C compliance for my code in TI's CCS for MCU RM57 then how can I do that? I can see 'Code Analysis' in the project preferences but I ...

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