Control Symbol Meaning

Did your instructor cover this in class?

Is there a reference in one of your course books you could review?

Are there any tutors available at you institution of learning that can help achieve your higher learning?

You obviously have access to the internet, have you ever heard of Google?

Have you ever attempted to do your own research?

Given the numerous home work and/or study questions you have posted on this forum, do you think it may be time to have a sit-down with your instructor for some extra help with your course study?

Just asking.

1. Tic Tac Toe X wins!

2. I guess that somebody doesn't understand how to make a power ON status light. Maybe this is to determine if any of the heavy current contacts are not making a good connection.

3. (The obvious but untyped question.) You do not have access to your text book but you must hand in your homework anyway.

Great minds think alike

There are millions of listings for schematic symbols on the internet.

If you can't find one, then I pity you.

Just to reinforce, but, slightly disagree: from

http://www.roymech.co.uk/Useful_Tables/Drawing/Electical_Control_symbols.html

So the configuration is primarily concerned with suppressing the sparks when the circuit is made.

Randall

i need to add :

The early-make aux contacts are special. In Schneider and some other designs, they are momentary.

The upper trace is that of the main contacts while the lower one is that of the early-make momentary aux contacts.

ABB uses early-make contacts which become early-break contacts while opening (counterintuitive, since early-make usually become late-break contacts)

Gee I thought we are all students. Life should teach us something new everyday. Whether the teacher is the task at hand we are doing or an instructor. We all learn, we are students.

tanx a lot for ur replay to #2 question. it cleared a lot of things. but #1 is still unclear because this cable symbol is used in our drawing but i cannot find it in IEC symbols list.the drawing is of siemens switchgear.the complete drawing is shown below.again the cross line on three cables is not understandable.

There is something else written next to each of the sloping lines: what do they say?

The "extra" short strokes seem to be missing from this drawing; is there a reason for that?

The crossing line seems to indicate that these 3 cable have a specific cross section and maybe the insulation class for thermal protection (?). the first looks like 35 with a square symbole for cross section (35 mm2 ?) and class F ?

In any case, this cross line is used to indicate some property common to the 3 wires, at each stage of the circuit.

I would agree with that assessment. Wire size and insulation rating.

Very German thing to do; They would refer to it as "Rationalizing" the circuit diagram. They like to rationalize everything, which to them means leave nothing open to misinterpretation (but only if you were trained in Germany, which if you were not, is irrelevant because you don't matter anyway).

My God, go learn what you're doing before you electrocute someone.

It takes to #12 to get to the nub of the question.

Coolyaar why do you make thing hard for yourself on here? People will help but without information how can they?

I will echo what others have said learn your job BEFORE you kill someone!