Re : Standard for general rules for low voltage switchgear assemblies and requirements for LV Panel with PLC / DCS

Hello Eddy,

Generally speaking, air handling units would fall under the MD/US SMSR, so the harmonised/designated standard would be EN 60204-1.

The 61439 series are not harmonised to the MD, only the LVD/UK EESR.

So for building controls I would expect 60204-1, MD / UL SMSR, & EMC / EMF compliance on the Declaration not LVD.

Morning Paul,

Thanks for sharing. Previously I use to Low Voltage Directive (IEC 61439 & 60947). Thus never come across of the IEC 60204-1 for Machinery Directive. I am also agree your information that building control is harmonized with machinery directive, Supply of Machinery Safety Regulations & EMC/EMF compliance instead of LVD. Any advise that how can I able to refer for this electrical design directive standard? 

Cheers 

Eddy Kee

The standard is available from BSI in the UK or any of the European Standard's organisations, as are the others below.

If you are building panels & equipment in accordance with the MD then you should hold a current copy of this standard, and any other relevant such as perhaps ISO 13850 for emergency stop functions, ISO 13809-1 & -2 for safety functions in general.

ISO 12100 the A-type standard, any specific C-type standards for the equipment you manufacture, ISO 14119 for interlocking of guards if you have them, ISO 14120 for the design of guards, the ISO 14122 series if you are designing equipment that requires means of access such as ladders and platforms.

Hi Paul,

Thanks for enlightening me on the standard. These standards will be my design guidance in heat and cooling system machines. I have a lot of difficulties during my engineering due to conflicts suggestion in safety and control which I not acceptable I need to rectify immediately. Appreciate your tacit knowledge.

Cheers

Eddy Kee

Please don't forget to reference the c-type standards for the products you are designing.

These will guide you on the PLr or SIL required for any safety functions and guide you in compliance with the requirements of ISO 13849-1 & -2, then if you have emergency stop functions there is ISO 13850.