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There! Its earthed.http://files.engineering.com/getfile.aspx?folder=67c7e1b1-e55b-4c19-9c0e-8148ee37ceb7&file=image001.png

Cheers all for your great input. Ive been looking at local wreckers to see if they have some old gens around. However ill need to borrow the megger from work before I commit. I like your initial excitation concept scott. It keeps things simple however I dont have access to the tools for making...

Thank you for the words of warning however I feel my skillset deems me capable to complete this task. Although im young to the trade, its a project I want to do because in my current line of work I feel Im loosing what I learnt at trade school and I want to challenge myself. Waross, although...

Cheers for the reply and info. Ill continue to do some research. Quite right with the inverter and battery however im hoping to achieve something more than that. I think ill try and find a engine around 6hp then. My air con draws 10A on start and thats probably my greatest starting load...

Im researching into making my own generator as a small learning project. Ive seen alot of people getting a lawnmower engine running a car alternator which powers a inverter however thats not very efficent. Ideally I want single phase 230V 50Hz And I want to produce between 2.3kW to 3.4kW. I...

Resistive is fine. The only time I would use inductive load banks would be on powerplants.

Ah my bad spelling. I meant Toroid. Also known as a current transformer.

Ended up been the shielding to the toliroid. The cable which connected to the toliroid had a earth shielding which had broken down. This was causing a fault current to be induced into the cabling. As for the arcing...who knows? Its not there anymore

Do you have to use sheet plastic? Sounds like your trying to reinvent a small version of the hesco barrier

Cheers waross. Im unsure what where your going with that fault process. If i disconnect the the main field windings the ill have no voltage and most likely no RCD fault. Getting to the diode pack on the rotor isnt a easy task and im unsure what output or result ild get. Point to note, I loaded...

Automatic bring up a good point with respect to continuity for quick recognition. In my opionion, putting the etop above or close to the stop button is defeating the purpose. You may want to consider the worst case scenario. Floor mounted estops are used so if the operators hands get caught in...

Got a pretty decent fault today. Thought ild share. Background and fault: Conducting a inspection of a 175kVA gen set. Gen is reasonably old. It has come back from a site where is was run underloaded and not serviced regularly. Has a number of oil leaks and we are considering writing it off...

Also note that most starter motors have a over running clutch which disengages the starter motor when the flywheel gear starts to run faster. The gear will still be engaged in the flywheel but the starter motor will be protected.

Cheers scotty. That makes sence with me. I was also thinking that for the 6mA/130ms RCD's the tripping time may be slower if the fault accured during the positive side of the sine wave, and you were testing the negitive side. I realize 50Hz is quick but when your talking about 130ms for the...

Sorry, majesus. I misinterpreted what you wrote as having a cable underground to switchgear then another cable from there going free air elsewhere. Regardless, ASNZS 3000 doesnt apply here

Thanks for indicating that Scotty. Wasnt aware of IEC standards. I think Australian standards (AS/NZS 3000:2009) still apply however. So I understand how the tester works, I understand what codes/standards insruct me to perfrom the tests. But why must I do the test? What is it proving?

I would reccommend you look up your wiring rules/standards. If your in Australia, the cable would need to be derated for the 3ft underground length. The rest of the free air cable would have its own derating factor.

Tester is good. The fault is a easy fix really, just replace the RCD. More concerned with why the tester comes with such a feature.

I had a fault with a RCD the other day which no one could explain. Just some background firstly: In Australia we have RCD's which are rated to trip at maximum of 100ms at 30mA for the majority of purposes. Our power supply is 230V at 50Hz nominal. Fault: I test for nuisance tripping as well as...