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Topic Title: DC power networking.
Topic Summary: Unsuitability of existing AC microbreak switches.
Created On: 13 September 2016 02:53 pm
Status: Read Only
Related E&T article: DC's low-voltage invasion
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 13 September 2016 02:53 pm
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Posts: 2
Joined: 18 January 2003

Any re-use of AC wiring for DC would have to allow for the replacement of any existing microbreak switches, which are not able to switch DC at other than low voltages. DC-capable switches are significantly larger, and would possibly not fit existing back boxes. This would significantly affect the economics of any such re-use.
 14 September 2016 09:18 am
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Joined: 19 July 2002

There are two opposing problems here related to LV DC.
With lower voltages the switches will be ok to break the circuit but the current carrying capacity of the existing switches and wiring may not be adequate.
With higher voltage the ccc may be ok but the switches will tend to arc.
The question is: What is the maximum voltage that the switches will be able to break?
12V will be ok, 24V is probably ok but above that the problems will start. I was involved in some work on higher voltage electrical systems for automotive use and by the planned 42V standard automotive components were no longer adequate.

Best regards

 30 January 2017 03:44 pm
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Posts: 11
Joined: 05 June 2015

Hi both, would you be able to complete my online survey with regards to LVDC please? Its 9 short questions and will help towards my BEng Dissertation.

Thank You,

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