Accessory circuits question

Check the instructions but the common terminals may be tied together internally (a la a Postwar ZW). If so using one common wire for both the 10 and 14 volt lines should be fine. 

An easy way to check is to use a light bulb like a simple grain of wheat. Place one lead on the common of either the 10 or 14 volt terminal and the other lead to the power of the other terminal. If it lights you have an internal common ground. If you have a volt meter you can do the same thing.

If there is no internal common ground tying the grounds together is ok. I would run both to a terminal board then run ground/power wires to each accessory.

Joe

MRC are nice units, but odd ducks. "Normal" rules don't apply, they use unique design and don't share much info.

 You are best checking everything and moving with caution with MRC.  

Start with Youtube, by Lionel, "phasing two or more transformers for use together and why".....Mike does a great job. Not too boring, or technical, a great primer/refresher to sine wave. (it is simply a moving graph. A voltmeter or amp meter with a timed graph and the time slowed way down... like a video frame editor and graph like a heart monitor.)

It the commons may not be common to each other. You need to check for 0-ohm or a phsicalp (spellwreck insists on helping.).... "physical" connection connection.

Does throttle(s) have commons also? 

Picture /link of the panel might help. Orientation can be a strong clue. Read the exact model off of the label too. I think maybe they used similar names for one unit (?)

Too many ways to tap power to safely guess/suggest anything on what's here so far imo. More info is needed.

On the MRC AH 101 the four common terminals-3, 4, 5 &6- are all connected together internally. So only one common wire is necessary, it can be connected to any of the four terminals. The only downside is it is possible to have increased voltage drop using only one conductor for the common unless you parallel wires or use a larger gauge wire for the common. If the runs are short then it will not matter.

Some additional info. The AH101 is not a great accessory transformer because the 10V and 14V fixed outputs are each limited to 7/10ths of an amp. Here is the relevant part of the instruction booklet.

Sorry, I royally screwed up my math. Decimal point in wrong place. The outputs are 7A each, much better!

I was gonna say he'd have some dim bulbs 😂

Looks like you're golden if it will phase ok.

Back to my overkill, and still not finding my old fav. charts because of "personalization" and "amp internet pages" ( Ive been reading on amp-pages.. really stupid crap..a saved page, inactive then when you click it reloads and clicks...useless but bing/google& others are delivering these... ? so you don't realize you're offline??? I haven't read a good reason; but see the possibility so likely 🤔 Some number like log ins must be down and someone want's that bonus...that's why!😒 Razum scratchum flagnerpletz..)

...14g for under 10ft @ 7a. Over that length,12g per awg charts. It's 10g for  20ft @ 8a.

Oh , you aren't mixing; no phasing... but watch that phasing video anyhow

Thank you guys for your responses...it has made it clear for me.  I will be running 14 ga. feeders.

Thanks again.