Questions tagged [iec]
The iec tag has no usage guidance.
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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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Industrial product IEC 61000-3-2 compliance
I have a question related to IEC 61000-3-2 standard for current harmonics limits.
I am working on an industrial product rated for 500W that connects to the grid (220VAC).
The standard states that ...
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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 ...
- 408
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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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What is meant by the statement "variation at all measured points (including the ambient air temperature) does not exceed 1K/h"?
I am trying to understand a temperature rise test that is being conducted over a switchboard. The test conforms to IEC 61439-1. The clause 10.10.2.3.1 (Method of test - General) regarding the ...
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Why is the temperature sometimes expressed as a difference between two values and not an absolute value?
I was going through an IEC standard - 61439-1, table 6.
For aluminum, the standard specifies the value as 55K which is a temperature rise.
IEC 60085 specifies the class B insulator absolute value as ...
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54
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IEC 61000-3-3 flicker for switches and relays
IEC 61000-3-3 shall be used for testing all 230V 50Hz AC devices with up to 16A current rating.
What about switches, relays, power plugs-basically devices that act as gateways between mains and actual ...
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What are the differences between UL1581 and UL2556 for VW-1 (Vertical Flame Test)?
In IEC62368-1, it's stated:
Wire complying with UL 2556 VW-1 is considered to comply with these
requirements.
I've asked a manufacturer if he could meet these requirements and he answered that he ...
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Voltage protection level Up of SPD (surge protection device)
I was going through the datasheet of the below SPD.
https://www.phoenixcontact.com/en-pc/products/type2-surge-arrester-val-sec-t2-3c-350-fm-2905339
It says, Voltage protection level Up ≤ 1.5 kV
It ...
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