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If you are trying to treat it as a "Manufactured Product" you would need to apply to the chief executive to get the electrical equipment approved as per the Electrical Safety Regulation 2002 (QLD). If you haven't already, the Act and Regulation can be downloaded from the Department of Justice...

I have been reading this thread with great interest (partly because I live in Brisbane and am currently working on LNG projects in Brisbane). From my interpretation of the act, Manufacturer's of electrical equipment must ensure that the equipment is electrically safe and when made is tested and...

Had a similar problem: a 10 storey office building with electronic ballasts in all the fluro's. Ballasts were blowing constantly (and randomly), we put surge suppressors on as you have and got the same results, a reduction but problem was still there. After countless hours chasing...

Check the load power factor. I have seen and heard of certain units that can't handle a leading power factor and it has caused the output chokes (and output isolating Tx if the unit had one) to catch fire. It rarely happens on the newer units as they are designed to run at a leading power factor...

Is the static switch unable alarm present whilst the input is supplied by the generator and not the mains. if this is the case it will have to do with the variance of the frequency output of the generator being out of tolerance with the settings on the unit. if it occurs whilst on mains supply...

Yer that is same unit i had issue's with as mentioned above. Prick of a unit really. Check the above with it and also perform individual load test of batteries should have your answer after that.

What model powerware unit? powerware generally dont have that issue with them. I had an older powerware unit where sounds like similar fault when batteries tested OK but when individual load test was performed more then half of the batteries where either dead or on there way out. They would...

What is the make and model of UPS? Some makes have it when the maintenance is due they will default to bypass and inverter is disabled until the alarm is cleared generally via software.

thermal imaging was done on the entire bus, temperature was around 100'C this was how we discorvered the issue. problem is is that it gets that hot on the imager the whole bus glows gets very hard to determine a hot joint.

yer the data logger will, in the last week or two have had readings of 2.5% voltage distortion on the phases and between 150 and 175 % THD on the neutral at times, the C.T is accurate its just with low currents it seems to be a bit ordinary dont wanna put a smaller one on which is 1000A just...

I have a 1750A bus-duct 4-wire WYE 240/415 50hz with a run of approx 70 meters supplying a mssb supplying 3 chillers in a high rise, which is overheating and melting the insulation the neutral is only rated at 100%. The data logger i have had on the ACB in MSB at last download reads 481.2 A @...

It can be done but for it to happen the unit would have to run in static bypass with the inverter acting as an active filter, there are a few manufacturers that do this. It wouldn't be advisable to run the inverter online and in parallel with mains supply as the units have programmable outputs...

cheers for the info guys, just never seen anything like this before. its a 50Hz 240/415 system, the only reason was heading in the direction of harmonics was the vibration only seems to be coming from the portion of bus supplying the mechanical services and none of the sub boards have any...

Sorry wasnt the way was meant to come across that way. I no what my THD% voltage as within limits of the power authority, its more in regards to THD% of current, i've been told just because they may have a high individual % doesn't mean they cause problems. At the moment ive got a swithcboard...

Hey, was wondering if anyone would be able to give me a bit of guidance on the analysis of THD%, having trouble discerning between which is causing problems and what isnt boof