ZS for an motor run off an inverter

davezawadi (David Stone):

No, a VSD is a stand-alone device, it needs nothing else to operate except a motor. There is no assembly, and one can buy integrated motor-VSD packages which can just be connected or have a plug fitted.

That would then be a pluggable appliance and not the sort of thing that we'd have to worry about  as far as BS 7671 is concerned ... the manufacturer would take all responsibility for the essential requirements of the Low Voltage Directive - or in the UK, Electrical Equipment (Safety) Regulations.


Since the VSD wouldn't do much without a motor, however (the right kind in terms of type and specification for that particular VSD), I'm not really sure it's a stand-alone device?

 

As for the GU10 lamp, the product standard is mechanical and says very little about the contents, the electronics, the brightness, the filament or LEDs, the colour temperature, the life. All this is simply about "level playing fields" and interchangeability and stifles innovation. Some standards are useful to all, for example, Screw Threads. However, this does not prevent other threads from being used if they are more suitable for some purpose, although this tends to single-source replacements. Cars are particularly bad at having bolts that are non-standard, particularly in the head size, because this suits automated assembly, but not repairs. BS7671 is becoming very prescriptive about items that really design decisions, usually on the grounds of alleged "safety" improvement, the real question is "exactly what degree of safety and risk" is reasonable and this needs to be exactly defined. If the same were applied to many human endeavors, most sport would never happen because people hurt themselves, some die, transport would be right out.

Today, if the GU10 is mains, the product standards cover electrical safety and efficiency. A filament GU10 is perhaps a different kettle of fish, but those fish are fast swimming away from us. Regardless, the manufacturer is still accountable for the essential requirements of the Low Voltage Directive.


The difference in this respect between appliances and components is that components either require technical skill and judgement to integrate into a system, or assemble into a pre-manufactured assembly.


So, yes, pluggable VSD, just go ahead and plug it in ... otherwise, you need the technical skill and judgement. which may well have to rely on some specification or instruction from the manufacturer.

 

davezawadi (David Stone):

No, a VSD is a stand-alone device, it needs nothing else to operate except a motor. There is no assembly, and one can buy integrated motor-VSD packages which can just be connected or have a plug fitted.

That would then be a pluggable appliance and not the sort of thing that we'd have to worry about  as far as BS 7671 is concerned ... the manufacturer would take all responsibility for the essential requirements of the Low Voltage Directive - or in the UK, Electrical Equipment (Safety) Regulations.


Since the VSD wouldn't do much without a motor, however (the right kind in terms of type and specification for that particular VSD), I'm not really sure it's a stand-alone device?

 

As for the GU10 lamp, the product standard is mechanical and says very little about the contents, the electronics, the brightness, the filament or LEDs, the colour temperature, the life. All this is simply about "level playing fields" and interchangeability and stifles innovation. Some standards are useful to all, for example, Screw Threads. However, this does not prevent other threads from being used if they are more suitable for some purpose, although this tends to single-source replacements. Cars are particularly bad at having bolts that are non-standard, particularly in the head size, because this suits automated assembly, but not repairs. BS7671 is becoming very prescriptive about items that really design decisions, usually on the grounds of alleged "safety" improvement, the real question is "exactly what degree of safety and risk" is reasonable and this needs to be exactly defined. If the same were applied to many human endeavors, most sport would never happen because people hurt themselves, some die, transport would be right out.

Today, if the GU10 is mains, the product standards cover electrical safety and efficiency. A filament GU10 is perhaps a different kettle of fish, but those fish are fast swimming away from us. Regardless, the manufacturer is still accountable for the essential requirements of the Low Voltage Directive.


The difference in this respect between appliances and components is that components either require technical skill and judgement to integrate into a system, or assemble into a pre-manufactured assembly.


So, yes, pluggable VSD, just go ahead and plug it in ... otherwise, you need the technical skill and judgement. which may well have to rely on some specification or instruction from the manufacturer.