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Subject: Re: TWL: DC Switches
From: David (david@XXX.XXX)
Date: Wed Dec 18 2002 - 10:21:22 EST
At 08:09 AM 12/18/2002 EST, GYMKIDD319@XXX.XXX wrote:
>Eric Thoman wrote that only "T" rated electrical switches,available by order
>from Lowes, should be used for dc..regular household switches do not last
>long he said.
>
>Does anyone know WHY this happens? I though all switches were primarily
rated
>via energy carrying capability, measured via watts...."Watts" so different
>about dc??
DC always shows a continuous potential to the switch as the current is
added or removed, were as AC current passes thru zero current in its cycle
during a disconnect thus exposes the switch to less current. The DC will
tend to burn out switches at a lower amperage than AC because of this and
are rated for less amps by the manufacturers.
BTW - This is why the bilge pump switches fail so quickly. They build up
weld deposits on each activation of DC current. If not designed with
expensive contacts and advanced engineering they fail. Apparently the
manufacturers cannot match the technology and price boaters are willing to
pay.
Skooch - Hatteras LRC 42
Worton Creek MD, (the Creek is frozen from shore to shore)
David Stahl
**************************************************************
Beacon Technologies Inc.
Serving The Delaware Valley
Business and Residential Internet Services
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