Series or Parallel?

[skyscraper]

Electrical safety start circuit switches should be connected in..........

My first thought was SERIES but re-thinking this makes me wonder just how safe a re-start of the circuit would be?

and yes, I new to the electrical field - studying for quiz - THANKS!

 

[iwire]

Starts are Normally open wired in parallel

Stops are normally closed and in series.

 

[electricalperson]

if the starts were wired in series you would have to press all of them at the same time in order for it to work.

 

[mdshunk]

Electrical safety start circuit switches should be connected in..........

What are you calling a "safety start"? That sounds like you might be talking about a two-hand controller, maybe? If so, they're not really series or parallel. They're both a seperate input to the two-hand controller.

 

[iwire]

What are you calling a "safety start"?

I agree that is an odd way of putting it.

If it was a two hand safety switch set up it could be series ...... or parallel if connected to a dual channel safety relay.

 

[skyscraper]

If it helps any, the questions of this particular quiz are in relation to building equipment - boiler, chiller, air handler, pump, etc

 

[mdshunk]

If it helps any, the questions of this particular quiz are in relation to building equipment - boiler, chiller, air handler, pump, etc

I guess that would be ordinary 3-wire stop/start stations, then.

Two hand controllers are generally only used on industrial machinery where you could get your hands chopped off or smashed if they weren't both in an assured safe place when the machine starts.

 

[electricalperson]

i think by safety start he means the machine wont start up again if the power is interrupted during a power failure. typical 3 wire controller with a holding contact

 

[electricalperson]

hope this helps a little.

 

[iaov]

hope this helps a little.

The Start Button is in series with the Stop button. the Start button is parralel by the holding / sealing contact on the relay.