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CONCERN? 115 Volt vs UK 240V

Posted: Thu Mar 24, 2016 6:51 pm
by bobby2007
Do I need to be concerned with 115 Volt USA, vs UK United Kingdom 240V.

I am in USA.

Re: CONCERN? 115 Volt vs UK 240V

Posted: Thu Mar 24, 2016 7:00 pm
by stderr
bobby2007 wrote:Do I need to be concerned with 115 Volt USA, vs UK United Kingdom 240V.
I am in USA.
The 117 volts in North America is much safer, I'd stay there.

Re: CONCERN? 115 Volt vs UK 240V

Posted: Thu Mar 24, 2016 7:09 pm
by plugwash
Whether you need to be concerned rather depends on what you are doing. The answer below assumes you were concerned about powering the Pi, if you are concerned about some other scenario please tell us what that scenario is.

The Pi itself is run off a 5V power brick, it doesn't directly see mains voltage. The power brick you use with your Pi needs to be suitable for the voltage you supply it with. Most power bricks are universal input but we cannot gaurantee that every power bick on the market is.

Re: CONCERN? 115 Volt vs UK 240V

Posted: Fri Mar 25, 2016 7:16 am
by DougieLawson
bobby2007 wrote:Do I need to be concerned with 115 Volt USA, vs UK United Kingdom 240V [sic].

I am in USA.
It depends on the equipment you're connecting. Most things aren't sensitive to the supply voltage, just don't ever bring a surge protector to the land of 230V as it will not survive it's exposure. I've found that my laptop power supplies run way hotter at 115V than at 230V, but I've never had any problem with a Raspberry Pi with the RPF branded power supply.

Re: CONCERN? 115 Volt vs UK 240V

Posted: Fri Mar 25, 2016 11:01 am
by Burngate
Regarding UK, of (slight) interest:
http://www.schneider-electric.co.uk/en/faqs/FA144717/
UK voltage to 240VAC + 6% and - 10% and European to 220VAC +10% and -6% (thereby creating a manageable overlap) and we would call these two combined 230VAC, despite the fact that nobody was intentionally generating at 230VAC!
And, given that the voltage can be reduced when, for example there's a coronal mass ejection forecast, I wouldn't rely on the mains being anything like 240v.

The frequency should be rather more predictable, at least in the long term, otherwise my grandfather's clock would be less reliable than it is.

Re: CONCERN? 115 Volt vs UK 240V

Posted: Fri Mar 25, 2016 5:59 pm
by pksato
bobby2007 wrote:Do I need to be concerned with 115 Volt USA, vs UK United Kingdom 240V.

I am in USA.
Also, you need to concern about ac mains frequency, 60Hz on USA and 50Hz on UK.

If is about power supply, if it use a switching, most work on large range of voltage and frequency. Just check label on unit.

Please, contextualize your question.
Generally, need to concern about AC mains voltage and frequency.

Re: CONCERN? 115 Volt vs UK 240V

Posted: Fri Mar 25, 2016 9:16 pm
by W. H. Heydt
It all depends on *why* you are asking if you should be concerned. For anything that plugs into the wall, check the "UL plate" where the input voltage range (and other data) is listed.Voltage in the US is variously described at 110v, 117v or 120v for most uses and not to be confused with 240v circuits meant for heavy appliances like electric stoves or electric clothes dryers.

Bear in mind that line voltage can not only vary, but it can get out of normal range....like the night I called my local electric utility because an alarm went of on a UPS and checking the status panel showed that its input voltage was 140v.

Re: CONCERN? 115 Volt vs UK 240V

Posted: Sat Mar 26, 2016 11:45 am
by masa-aud
reply to bobby2007 on power line voltage
I think it seems a trivial one but somewhat educationally reminding us safety of power lines.
It is clear that a higher voltage and lower current power line is more dangerous if you dare or happen to touch directly bare calbe on such line.
We should note that High-V low-A line will cause liekage by dusty plugs and receptacles in humidity, and low-V high-A line will cause over heat by rusty plugs and receptacles.
Raspberry Pi and perifferals are well safely separated from these power line with power adapter from 100-240V AC to tightly insulated 5V line for Rasp's .