Gentlemen, and ladies, and others (we live in a sadly Politically Correct
society, we have to take all genders into account!)
It is the norm in the UK to describe the floor at ground level, 'Ground
Floor', the next floor up is 'First floor', and the next 'Second floor'.
You can see the mathematical progression here...
In switch speak, we indeed talk about 'upstairs/downstairs' switches, in
that context, as '2 way', but in the functional discrete context a '2 way'
switch is that which has a single pole and a normally open, and normally
closed contact, or 'change-over'.
The Number of Poles is described by the term 'poles', such that a switch
with two poles is described (not unsurprisingly) as a '2 pole' switch.
The two descriptive terms above may be combined to expose complex arrays
such as '2 pole, 2 way', or '3 pole, 6 way', or 'x pole, y way' where x
and y are integers in the set of real numbers.
Now, are there any Grannies out there that need to know how an egg might be
sucked?
Regards,
Chris Duprés
"Jacob Schanker"
<schanker@frontie
rnet.net> To
Sent by: "EMC-PSTC" <[email protected]>
[email protected] cc
Subject
06/12/2005 20:03 N-way switches
Folks:
Here is my take on this confusing topic. I welcome being corrected, or even
abused, although there is a charge for the latter.
In the US, N-way means the number of switches (locations) which control a
single lamp, *not* the number of positions (poles) of the switch, per sa.
So an ordinary single switch-lamp combo is a 1-way, but the 1-way is
understood. Two switches, as at the top and bottom of a flight of stairs
would have each being a 2-way switch.
Speaking of stairs, this reminds me of the disconnect between the US and UK
on the numbering of floors in a building, and the counting of the "stories"
in a building. As I recall, the US likes to use the designation "Ground"
for what the UKites would call the first floor. It is equivalent to us in
the US beginning the count at zero, which should tickle an engineer's
fancy.
But that's just my opinion, I could be wrong.
Regards,
Jacob Z. Schanker, P.E.
65 Crandon Way
Rochester, NY 14618
Tel: 585 442 3909
Fax: 585 442 2182
[email protected]
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