Questions tagged [iec]
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42 questions
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Clearance calculation according to IEC 61010-1 section K.3.2
I'm designing a circuit which has to meet the standard IEC 61010-1. It has a transient voltage limitation at the input, so I can calculate my clearances according to section K.3.2.
The surge ...
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Why is transient voltage not taken into account when calculating creepage?
I am working through the creepage and clearance in IEC 61010-1, and I find that transient voltage (1.2 x 50 µs) is taken into account for clearance, but in creepage, only the working voltage is taken ...
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Does testing the open neutral single fault condition in IEC 60601 turn the electrical equipment being tested off?
My question is about the open supply conductor fault test in the electrical safety testing of medical equipment under IEC 60601.
Given the equipment is otherwise on for the test up until this fault is ...
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Shielded Cable for IEC 61000-4-6
BSEE here but I’ve been writing firmware for twenty years and my electrical knowledge is rusty. We have a USB device we want to test to 61000-4-6. My boss is saying that because we don’t have the same ...
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Hipot Test Leakage Current - Canada IEC 62368-1
How do you get the leakage current parameter for hi-pot test? There is only tables for voltages in IEC 62368-1.
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IEC 62052-11 Heating test, what does it mean 25 K?
In IEC 62052-11, Heating test, describe as below,
7.2 Heating Under rated operating conditions, electrical circuits and insulation shall not reach a temperature which might adversely affect
the ...
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Dealing with IEC and NEC wiring color code in the same equipment
I am dealing with IEC and NEC standards for wiring color codes.
For the first time, I have to integrate european (and UL certified) COTS products - power supplies - into a system for the US market. ...
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Intrinsic safety (IEC60079-11) - assessing spark ignition of RLC circuit, but the L is placed before the zener barrier
My IS circuit contains an inductance, capacitance, and resistance. Shown below is the simplified schematic, with uncountable and countable fault applied, resulting in the most onerous condition:
The ...
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Standard defining whether to strip multi-core cables inside the cable duct or close to IO Card
During the factory acceptance test (FAT) of a remote IO panel (24V, atex zone 1,) the client did not accept that the multi-core cables were stripped inside the panel wire duct. He said that they ...
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Intrinsic safety connection protection between two intrinsic safety devices inside a hazardous zone
I am designing an RF module in in a hazardous zone (in the picture it is shown with DCDC and MCU etc.) My module gets power supply from AC/DC.
I read about intrinsic safety barriers from the IEC 60079-...
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Electrical Standards for Exposed DC Connections
We are trying to make a slide lock connection between two parts and thus need to have some sort of connector between them.
I am wondering if anyone is aware of a IEC standard relevant for connecting a ...
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Why there are no IEC C8 to NEMA 1-15R cables?
Conntek has an IEC C8 to 1-15R adapter. C8 to CEE7/16 cables are dime a dozen on Aliexpress. Yet there are no C8 to 1-15R cables as far as I can tell. Is there an electronics/standard reason ...
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Does the use of an IEC line connector on equipment require a UL cert?
My client wants to use a 12V SLA with a built-in line-powered charger in his gear. If I add an IEC AC mains line connector does this turkey now have to go through cert?
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Can an unpolarised (C7) plug be used safely in place of a polarised (C7P) plug?
I bought this AC adapter from the US to replace a broken Australian one. Unfortunately, the power brick is keyed for use with the polarised C7P plug. Unpolarised C7 appears to be the standard in ...
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Determination of temperature rise - Deviation of ± 5 K
I was referring IEC 61439-1 standard for the deriving the temperature rise of an assembly through comparison. We can derive the current rating of an assembly (low voltage switchboard) at any point (...
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