24 Apr
2016
24 Apr
'16
12:26 a.m.
----- Original Message -----
From: "Eric Smith" <spacewar at gmail.com>
Sent: Sunday, April 24, 2016 1:38 AM
On Sat, Apr 23, 2016 at 8:18 PM, dwight <dkelvey at
hotmail.com> wrote:
It kinda does, if you think of 'normal' not as a fixed function of the switch but
its logically inactive state, usually relative to its (possibly implied) label and
function. If a push button is labelled 'RUN' then the 'normal' state is
opposite and away from that label, i.e. out or up; similarly, when a toggle switch is
labelled 'RUN' then its 'normal' position will be opposite that label and
like the momentary switch in that NORMAL state it can be either OPEN or CLOSED (with a
complementary contact if it's a DT switch).
Schematics will usually determine and indicate the 'normal' state and the switch
should be mounted, labelled and connected accordingly.
The on/off light switches in your house would be considered NO; by convention toggles (if
any) should be UP to CLOSE and turn on the light and the 'normal' state would be
OPEN and pointing DOWN.
m
You'd need to decide, LOAD is switch up or
LOAD is switch down.
Which still doesn't explain how a toggle (not momentary) can be said
to have NC and NO pins.------------