DOL settings

[pitkin2020]

Lucien is not wrong, but, you should NEVER in real life calculate motor current from the information you have been given.

If I was doing the AM2, I would be writing to tell them why they were wrong, and explaining why, and, should I fail because of it, then they would be facing my full wrath, which they would not be liking.

Thank goodness, I don't have to take this stupid exam.

i appreciate that but i feel they wont care. I heard last week someone failed because they used 2.5mm singles instead of 1.5mm, whilst i understand it wasn't to spec seems a bit harsh for an outright fail, and the practical section is the most expensive to retake

 

[Lucien Nunes]

There is a difference - in this case based on what you've stated, the question is too vague. Exactly as Paul says, calculating FLC is a matter of last resort because a) you usually know it already from the motor data, and b) you usually don't know the other parameters accurately. Setting the O/L relay correctly is important for safety and reliability, so it should not be based on approximate or assumed figures.

 

[netblindpaul]

i appreciate that but i feel they wont care. I heard last week someone failed because they used 2.5mm singles instead of 1.5mm, whilst i understand it wasn't to spec seems a bit harsh for an outright fail, and the practical section is the most expensive to retake

Well yes they should fail if the spec says 1.5 & they have 1.5 available, but choose to use 2.5.

However, if the question is fundamentally technically incorrect/inadequate/flawed, then they would be getting a bullet off me, and trust me, they would not be dodging it.

I simply would be not doing that part of the exam and, getting the examiner to acknowledge that it was an unsound section.
My local AM2 centre would not question me, I know, but that is not the point.

In fact, if that is the situation, then I will be visiting my local AM2 centre again, I was there earlier on in the week, and it looks like I will have to return, and check this exam out, because if it is wrong, then it needs changing.

If what you have said is right, then the exam is wrong, and people could be failing due to the exam being wrong, and that is wrong.