Questions tagged [iec]

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AC/AC power supply for PCB

I am trying to source the right setup for powering this PCB: I have found an 18 V AC/AC power supply but it has a barrel connector: I am struggling to work out how to connect the barrel connector to ...
6 votes
2 answers
172 views

How do we calculate the sub-transient current (initial symmetrical short-circuit current)?

For the ease of understanding, I have divided my questions into two sub-parts: Per IEC 60909, the initial symmetrical short circuit current is calculated by: \$I_k"=\frac{cU_n}{\sqrt(3)Z_k}\$. ...
2 votes
2 answers
510 views

How to hook up a transformer to 120V AC?

I'm building a DC power supply and am stepping down my voltage from 120V (from the outlet) to 24V through a transformer. I will be soldering the 3 wires that plug into a North American electrical ...
0 votes
0 answers
60 views

24V DC Industrial equipment - which IEC standards to comply with

I'm trying to design a commercial industrial product/PCB for the first time. In order to do it "right", I would like to be aware about the most common IEC / IPC standards to comply with. ...
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2 answers
66 views

Is there any standard or norm for this situation?

Considering a metallic enclosure(which has PSU and electronics in it) with an IEC mains socket, an example shown below: And it uses an IEC power socket such as: For this kind of enclosure is there ...
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1 vote
1 answer
111 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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0 votes
0 answers
59 views

IEC 60664-1 clearance between phase and earth

With IEC 60664-1 you require clearance between phase and earth. But if you have a resistor voltage divider between phase and earth do you need the same clearance between the pads of the resistors? Or ...
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0 votes
1 answer
1k views

IEC 61010 table for creepage distances

Good day I am making a pcb layout that is required to comply with the IEC 61010-1. In the standard, there is a table for clearances and creepages, which depends on working voltage, pollution degree ...
1 vote
1 answer
2k views

How to calculate power loss & voltage drop in three-phase power cables

What is the correct formula/method to calculate cable power losses in a three-phase system? I'm unable to find any IEC standard outlining the same. If you consider 3C/4C cables, the manufacturer ...
1 vote
0 answers
39 views

What are the IEC standards/certifications to look for in a DSO while making measurements pertaining analog parameters like CMRR, SNR, THD etc

I am in the process of measuring CMRR for our mixed signal system that deals with bio-signal acquisition. I am using DSOX2014A keysight entry-level oscilloscope to make measurement to derive CMRR, SNR ...
2 votes
0 answers
79 views

Why are computer displays Class I devices but TVs Class II?

I was wondering why all computer displays I know are Class I devices, or at least come with a Schuko plug, while all TVs I know are double insulated Class II devices? I understand it might have ...
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2 answers
559 views

Do I need to insulate down conductors in a lightning protection system?

When we install seperate down conductors in an external lightning protection system, do we need to fully insulate it or need to insulate in touchable areas? Is there any requirements in IEC 62305 ...
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1 vote
1 answer
80 views

When does an electrical product get an RU (Underwriters Laboratories) certified mark?

If you take an example of contactor, it can be used in residential, industrial, electric vehicle applications etc. Let's say the contactor has passed the UL standards corresponding to the industrial ...
0 votes
1 answer
440 views

Do we have equivalent standards for all UL standards under IEC?

As per the image, it looks like there will be an alternative standard in IEC with respect to every UL standard?
0 votes
1 answer
99 views

United Kingdom Split Phase Transformer / Centre Tapped Earthed (CTE) / 55V - 0V - 55V - How do you wire the connector?

I'm working on a weird project which involves making a custom cable for a British CTE Transformer. For those not in the know, these transformers are typically used at jobsites to provide 110V power. ...
1 vote
0 answers
59 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?