Can anyone figure why the fuse?

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petersonra

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
It's not drawn in any way I would ever draw it but I think what's supposed to happen is when the normal Power fails the relay deenergizes and normally closed contacts turn on the emergency lights. I think the pull fuses are for testing.
 
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Designer69

Senior Member
petersonra said:
It's not drawn in any way I would ever draw it but I think what's supposed to happen is when the normal Power fails the relay deenergizes and normally closed contacts turn on the emergency lights. I think the pull fuses are for testing.
Click to expand...

Thank You. So I am trying to create a similar diagram for an ALCR and if I want to achieve the same purpose with pull fuses as the first diagram, should I insert them here?

Diagram2.jpg
 
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Ingenieur

Senior Member
Location
Earth
terrible drawing
makes little sense
why 3 wires to the relay? trigger?
when Sk is closed you have H on both sides of the relay?
when open you have zip
as far as I can tell relay NEVER activates?
 
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Designer69

Senior Member
The ALCR diagram is good. I just am not sure where to insert the pull fuse.

petersonra said:
this is what I think is desired.

View attachment 20464
Click to expand...


This is exactly the same diagram as the first one I posted. This is fine when EMRG. and Normal lights are on different switches.

When EMRG. and Normal lights need to be on the same switch then you need the ALCR diagram I drew, one of the inputs is the switch sense.

I guess the pull fuse goes only on the Normal 120V before the switch.
 
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