Wireless Set No. 52 Canadian - Project

[David Dunlop]

Congrats on the new switchboard, Chris.

After a couple of days trying to figure out where that short black lead had originally come from in the switchboard wiring, I was about ready to set it aside and move on when I remembered I had just been looking at all the standard Switchboard, Charging No. 5C possibilities. This switchboard was actually a No. 5C Mk I, with two additional sets of Battery terminals, so I took a closer look at the two negative Terminal Posts.

From the back of the switchboard, the additional negative terminal on the right hand side was too far away from any negative terminal on the lower switch, that it could logically tie into. Likewise, the upper switch. On the left side, things were suddenly looking up big time. With the curve of the wire for engaging the new negative battery terminal, properly oriented on the terminal stud, the smaller end for wrapping around a switch terminal, was properly oriented for engaging a terminal on the left side of the lower switch, and just the right length to engage the same switch terminal as the standard negative battery terminal wire was connected to already.

The current school of thought for the creation of the Switchboard, Charging No. 5C Mk I Cdn is that it was developed to help solve the thirst for Amps that the 52- Set and 19-Set HP had, in comparison to the basic 19-Set. The easiest way to do that is to connect a second set of wireless batteries in parallel with the original set of batteries. This preserves the critical 12 Volts DC in the system for providing the required Low Tension feed to the wireless set. The big gain, however, is that instead of say just 175 Amp Hours from the original set of wireless batteries, the available Amperage doubles from 175 to 350. The higher the available amperage, the longer the wireless set can run before the batteries need recharging. What I am unsure of at this point, however, is how lone would it take for the standard 300 Watt Chorehorse to fully recharge two sets of wireless batteries connected in parallel, and could it handle the load of doing so easily?

In the attached photo, the top left terminal is the original N0. 5C Negative Battery Terminal, and the inboard is the new addition on the No. 5C Mk I switchboard, paralleled to the same switch terminal.



David