Wiring A Zw transformer through TUI to Lionel standard track to run DCC and Conventional control

Are there any trains on the track when the breaker trips?

Mat posted:

...I have found that I have no resistance in the track when checking for continuity...

Even one bulb in one switch or accessory will indicate "no resistance" with a continuity checker.

Lou1985 posted:

Are there any trains on the track when the breaker trips?

Yes a couple of unhooked cars and an MTH SW-1 switcher I Am trying to recognize on my DCS remote.

Remove items. Test again to see if the breaker drops. If it does, you have track or wire or tui issues. if the breaker holds....

Try with engine only. Trips? Either breaker is too light or you have an engine issue.

or ..You could add up bulbs to a 3a draw (+/-.5a-1a) to see where they drop out.

3a seems kinda light to me for a fast blow breaker, but I don't know what the tui will let pass there total either. 

Motors have peaks that need some elbow room before a breaker trips. Thermal breakers do a nice averaging job, allowing quick peaks to fade.

High speed electronic breakers or magnetics want to cut off at the first sign of overage, so should be chosen above the max ever used by a train+track, 3.75-5.75a .minimum would be more like it. Passenger cars too? Leds or bulbs? Amps used get added, from .25a bulb to 5.25a. motors ..still not half of what you have on tap. Lionel #91 breakers magnetic breakers are adjustable