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From the ZTC website:-

QUOTE Q: Should I remove the EMC suppression components from my Locomotives?

A: We NEVER recommend the removal of the suppression circuitry.

First, it is illegal for us, or for that matter any other manufacturer to recommend the removal of a third parties EMS suppression devices. These components are fitted to ensure that the products do not interfere with TV`s and the like, which causes a nuisance and inconvenience. However this also includes some much more important items such as Pace Makers which are life critical.

Secondly, all of ZTC`s Decoders are designed to work with these components installed, as we believe are those produced by other manufactures, but only they can confirm this.

Thirdly, These components are also a necessary requirement to enable the various locomotive manufactures to obtain the obligatory EMC approvals. This testing permits them to print a CE mark on their products, which is also a legal requirement for all electrical equipment sold throughout the European Community.

In an effort to try and clarify this recurring confusion, ZTC Controls Ltd. formally tabled the question at the NMRA DCC working Group (of which other DCC manufactures and we are members) in September 2004 in Salzburg.

The question was "Does any manufacturer of DCC decoders recommend the removal of the locomotive suppression components when fitting a decoder in to a locomotive".
There were 30+ members present and not one said that they would, or do recommended their removal. The working group then minuted this fact.

This information was picked up, and later published on the Yahoo DCC web site by a qualified EMC Engineer, but the myth still seams to prevail that they should be removed.

Incidentally tests conducted by ZTC engineers indicate that many decoders properly installed, from a variety of manufactures including ourselves often do not work as well with these components removed.

Happy modelling
Gary
 

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QUOTE The question (to the NMRA working group) was "Does any manufacturer of DCC decoders recommend the removal of the locomotive suppression components when fitting a decoder in to a locomotive".
There were 30+ (NMRA) members present and not one said that they would, or do recommended their removal. The working group then minuted this fact.

It is not a ZTC thing. It is an NMRA thing. If a capacitor is fitted to the loco prior to decoder installation then the decoder should be capable of functioning with the capacitor present. If it does not then it cannot comply with NMRA standards. The NMRA do not endorse the removal of CE EMU supression devices from locomotives.

Happy modelling
Gary
 
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