On 12/29/2012 08:05 PM, Mike Nicewonger wrote: > You'll see designations in the parts books like SPNC and SPDT. Single > Pole, Normally Closed, and Single Pole, Dual Throw. > > The SPDT is the one that will do both (or either) normally open or closed. Actually I need to correct myself. Ignore the SPDT comments. That refers to switches.