How to connect two circuits into on light bulb with a switch in each

Question

I am not an expert. but I have two circuits, each on is 220v and both have a switch. I want to connect the two circuits into one light bulb. what I have to follow or need to know, To make this happens?

if any one of the switch turned on, the bulb goes on. and doesn't goes off, until all switches is off.

UPDATE

THIS DIGARM IS JUST FOR CLARIFICATION NOT FOR ACTUALLY USE.

I did this to clarify what I mean. what I need to adjust to make this happen. I don't mind major editing.

^{simulate this circuit – Schematic created using CircuitLab}

Answer 1

As you said yourself, you should never directly connect two circuits together. But the behavior you want could be done with a relay:

^{simulate this circuit – Schematic created using CircuitLab}

You can expand this to as many circuits as you want, as long as they are all isolated from each other with the appropriate relay arrangement.

Of course, if the directly-connected circuit (LINE 2 as drawn here) trips its breaker, then none of the switches will turn the light on, but you'll have that problem with any safe solution. Just choose which circuit should be the direct one and use relays for the rest.

AND CLEARLY MARK WHEN YOU BUILD THIS THAT THE RELAY'S CONTACTS ARE NOT FROM THE SAME POWER SOURCE AS THE COIL!!! This is important for the next person's ability to work on it safely.

Answer 2

^{simulate this circuit – Schematic created using CircuitLab}

Answer 3

^{simulate this circuit – Schematic created using CircuitLab}

Figure 1. Two switches in OR arrangement.

I have drawn the circuit on a 12 V supply. I recommend this as the maximum voltage you should work on as your question suggests that you are not qualified - never mind an expert - to work on higher voltages which risk electrocution.