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cyberblak
Joined: 19 Jul 2005
Posts: 139
Helped: 6
Location: Canada
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 30 Aug 2006 19:03 Why 24Vac in building automation?? |
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Hi,
Anyone knows why they building automation devices are 24Vac powered? It seems to me that 12Vdc, per example, would be far more practical (no need for rectification and regulation from a high voltage on the device end).
Any idea?
Thanks,
cyberblak
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PaulHolland
Joined: 15 Jan 2003
Posts: 625
Helped: 59
Location: Holland
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| 30 Aug 2006 20:09 Re: Why 24Vac in building automation?? |
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Flexibility, AC you can transform easy to other voltage levels, up/down etc.. not everything needs DC. relay, valves etc..
Paul.
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cyberblak
Joined: 19 Jul 2005
Posts: 139
Helped: 6
Location: Canada
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| 31 Aug 2006 0:15 Re: Why 24Vac in building automation?? |
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| But, still, you need to rectify and step-down that voltage into each device... Doesn't this add up to the costs?
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IanP
Joined: 05 Oct 2004
Posts: 6361
Helped: 1509
Location: West Coast
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| 31 Aug 2006 2:03 Re: Why 24Vac in building automation?? |
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This voltage level seems to be chosen for safety reasons ..
According to some publications 24Vac and 48Vdc are recognized as the maximum safety voltages that are not hazardous to humans ..
Regards,
IanP
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funster
Joined: 30 Jun 2005
Posts: 235
Helped: 12
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| 09 Sep 2006 16:13 Re: Why 24Vac in building automation?? |
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using 24V AC is for flexibility and safety.
AC voltage can be converted into any other voltage easily,
but DC convertion require complex circuit.
best regards
| cyberblak wrote: |
Hi,
Anyone knows why they building automation devices are 24Vac powered? It seems to me that 12Vdc, per example, would be far more practical (no need for rectification and regulation from a high voltage on the device end).
Any idea?
Thanks,
cyberblak |
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