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D.C.C. Normal & Maximum Voltage
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 Posted: Wed Apr 25th, 2018 08:32 am
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2foot6
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There seems to be some confusion on my behalf of the NMRA standard voltage for DCC at the rails.I recently replaced my Uhlenbrock controller to the intellibox II which has 20 volts at the track.A few of my decoders in the past went up in smoke as they were designed to operate on 15 volts and some tolerated the old controller(intellibox) that had an output of 18 volts at the rails.Now with 20 volts I can expect to have a few more melt downs , so what is the standard voltage? It seems to me the standard voltage in the USA is 15 volts and in Europe it is 27-28 volts,but each manufacturer seems to advertise made to NMRA standards,which one is right?Is there American labelled decoders that will withstand 28 volts?..................Peter 

Last edited on Wed Apr 25th, 2018 12:25 pm by 2foot6



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 Posted: Wed Apr 25th, 2018 01:34 pm
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Helmut
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Uhlenbrock has got the NMRA conformance approval. That is, the IB voltages conform to this standard.
So if your decoders burn up at >15V on track, they do not conform to the NMRA standard, as this specifies 24V at least.



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 Posted: Wed Apr 25th, 2018 01:38 pm
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NathanO
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The NMRA Standard says a max of 22 volts. The problem is many manufactures decide to do what they want so they design their equipment for what ever they want.

There are US made decoders that will withstand the full 22 volts but you have to look at the information on the decoders on the manufactures web site.

Most, but not all, controllers and boosters can be adjusted to lower voltages. It should be covered in the instruction book.

What scale are you working with?

Nathan

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 Posted: Wed Apr 25th, 2018 02:49 pm
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2foot6
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I'm modeling On30 using 70% Bachmann locos and decoders,the rest is scratch built and kit bashed locos with decoders that were a good price at the time when I needed them.I have been searching the net and web pages of manufacturers,(that was the main reason for this topic)a number of them don't seem to state the track voltage,NCE and TCS are two I can't find the track voltage information.Tsunami and Hornby do state the track voltage of 22 and 27 volts...............Peter.



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 Posted: Wed Apr 25th, 2018 03:16 pm
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Helmut
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As I wrote before, look for manufacturers whose decoders got the NMRA conformance label. BTW, the IB can be set to 'N' output voltage, which is 18Vmax IIRC.



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 Posted: Wed Apr 25th, 2018 07:07 pm
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NathanO
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Some of the NCE decoders for N and HO have a voltage limit of 15 volts. What are the NCE decoder number?

Nathan

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