Add BIG RED button calc for Amps

README.md

@@ -378,6 +378,26 @@ Now I was looking at the [APC UPS 1500VA UPS Battery Backup and Surge Protector
 
 Now let us look at the Voron 2.4 LDO kit. When I add up all the "INPUT AC Current (typ.)" values for that build I get a total of 4 Amps.  I have a extra APC UPS unit here at my home that is called [APC UPS 850VA UPS Battery Backup & Surge Protector](https://www.amazon.com/gp/product/B01HDC21FE). So I take 850/115 = 7.3913 Amps maximum.  I am only using 4 Amps. What is my left unused overhead value? 1-(4/7)*100=42.86%. I feel better with an overhead that large.  I personally would not buy a UPS unit that did not give me at least a 10% unused overhead value.
 
+## How to calculate the Amps required for the BIG RED mushroom button 
+
+1/11/2022:
+
+To calculate the total "INPUT AC Current Draw" from your Voron 2.4 build, look at each of the PSUs you have included in your Voron 2.4.  On the data sheet for the PSUs you will see a specification labeled "INPUT" "AC Current (typ.)" there should be an amount of amps listed for either 115VAC or 230VAC. Take the "INPUT AC Current (typ.)" values for your type of power distribution system and add them all together to get a total "INPUT AC Current (typ.)" value. 
+
+So for example, I am in the USA, so I added all my "INPUT AC Current (typ.)" values together for the 115VAC option and my 4 PSUs and draw a total "INPUT AC Current (typ.)" value of 11.7 Amps for the QUEEN build. For the Voron-LDO build by total "INPUT AC Current (typ.)" value is 4 Amps.
+
+I purchased this [BIG RED Mushroom Emergency Button](https://www.amazon.com/gp/product/B07RJMVPJ4) which is rated upto 10 Amps. So, for the Voron-LDO build this [BIG RED Mushroom Emergency Button](https://www.amazon.com/gp/product/B07RJMVPJ4) will work without modification.  I can run both the AC "LINE" and the AC "NEUTRAL" wires from the wall outlet into the "BIG RED" mushroom button and use the two NC contacts to switch those lines (one contact per wire).
+
+But for the QUEEN Build the total "INPUT AC Current (typ.)" value is 11.7 Amps, which is above the rated 10 Amps for this [BIG RED Mushroom Emergency Button](https://www.amazon.com/gp/product/B07RJMVPJ4).  The problem is I could not find a BIG RED Mushroom Emergency Button that is rated for 20 Amps on Amazon.  So this is what I have opted to do.  In the USA, we really do not need to switch the AC "Neutral" wire but switching the AC "Line" wire is what is really needed.  Since this [BIG RED Mushroom Emergency Button](https://www.amazon.com/gp/product/B07RJMVPJ4) has TWO normally closed (NC) contacts and each contact is rated for 10 Amps, I can just run the AC "Line" wire into the two NC contacts in parallel. Think of the BIG RED Mushroom button as a DPST switch.   By wiring the contacts up in parellel then each contact will handle 10 Amps and now my BIG RED Mushroom Button can handle 20 Amps on the AC "Line" wire. On the output of the NC contacts the two AC "Line" wires are brought back toether for a single output feed.
+
+So now I need to change my AC wiring diagram to reflect this change in the BIG RED button for the QUEEN Build.
+
+To learn more about parallel ciruitus see [UNDERSTANDING & CALCULATING PARALLEL CIRCUITS - EXPLANATION](https://www.swtc.edu/Ag_Power/electrical/lecture/parallel_circuits.htm)
+
+Here is a diagram on how to wire two NC contacts up in parellel:
+
+![ParallelDiagram](../images/Parallel_Diagram.jpg)
+
 
 ## The PDF file of the "Color PIN Diagram" for the Octopus Pro V1.0:
 

images/Parallel_Diagram.jpg

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