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Offline Mr. Ron  
#1 Posted : 08 September 2021 03:11:11(UTC)
Mr. Ron

United States   
Joined: 05/07/2020(UTC)
Posts: 112
Location: Mississippi, Vancleave
A common buss is necessary on DC powered layouts to account for voltage drop, but is a buss necessary on AC layouts? BTW, my AC layout is analog.
Offline H0  
#2 Posted : 08 September 2021 09:02:51(UTC)
H0


Joined: 16/02/2004(UTC)
Posts: 14,261
Location: DE-NW
Bus or star - it's up to you how you distribute power.
But voltage drop applies to both AC and DC and having several feeder wires is essential.

For temporary table layouts you can get away with one feeder for 20+ meters of track.
For a permanent digital layout with scenery, I would go for one feeder every meter - or maybe even more.

When using a large temporary layout in analogue mode, when running a modern digital Köf II you will not notice any voltage drop. But with a Märklin 3015 Crocodile the effect of voltage drop will show massively.
Pick a power-hungry loco for the test runs.

If you try to determine the voltage drop with a volt meter, make sure there is a huge current draw at the spot where you measure the voltage - one or two dozens of light bulbs should do.
Regards
Tom
---
"In all of the gauges, we particularly emphasize a high level of quality, the best possible fidelity to the prototype, and absolute precision. You will see that in all of our products." (from Märklin New Items Brochure 2015, page 1) ROFLBTCUTS
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