Live + neutral + earth on PCB

[kalbun]

I am about to design a simple control board for an industrial equipment.

To reduce the amount of cabling, the customer asks to have the earth connection on the PCB - along with live and neutral.
If I remember correctly, there is a safety restriction which forbids having live+neutral+earth on the PCB. You can have live + neutral, provided you respect the safety distances, but not all three.

I wasn't able to find the reference to the document. Can someone help me?

 

[FvM]

There's no respective rule in the regulations for electronic instrumentation that I know (EN 61010, EN 50178). Standard requirements for protective earth apply: sufficient cross section, corrosion-resistant connection.

 

[KlausST]

Hi,

It is not unusual to have all three connection on one pcb.
Many line filtering circuits use X and Y capacitors connected to all three lines..

Klaus

 

[kalbun]

Thanks for your answers.
In facts, my source of information is a consultant with some experience of CE marking. Years ago I designed a board similar to this one, and he told me "don't put the earth on the PCB or you won't get the CE".

I was in a hurry so didn't investigate further, and he did not provided any EN reference, either. So there are chances he was wrong.