schedule of inspections - motor starter

[feelingfat]

HELP I've got my 2391 practical and I've got conflicting opinions on the motor starter. Is it an under voltage device or not. I'm seriously confused as all sources are ones I would trust.

Do I tick the box or not?????

Lightbulb please!

 

[NozSpark]

Well,,, does it turn off on a power outage?

If it is then it is an undervoltage safety device,,, i.e. Motor won't restart on resumption of supply

 

[feelingfat]

Ahh, now you've got me. I don't know if I am being pedantic but is undervoltage a complete loss or just a small fall in supply voltage for whatever reason? If it is a complete loss then I can see that it would be a safety device and noted, thanks

 

[NozSpark]

Any drop in voltage that could cause any dangerous operation of a machine or device is an undervoltage.

 

[Andy™]

a contactor will drop out at a low voltage, along with no voltage

 

[feelingfat]

Cheers chaps, the fog is clearing although someone has mentioned that horrible word Scope, not here I must add.

Light.......bulb!

Thanks

 

[Sidewinder]

feelingfat,

I suspect that you have heard of scope with regard to, does BS7671 actually apply to the motor starter in question, it may not, thus, it may not be part of a periodic inspection in accordance with 7671?

 

[NozSpark]

Wouldn't that depend on wether the starter was part of the machine or the installation sidey?

 

[Sidewinder]

Exactly my point and why I try not to post in the Student Zone, which is where I have just realised this perhaps should be!

 

[a3]

Thread Moved

 

[NozSpark]

But IIRC the motor starter is included in the PIR during the 2391 practical