I have an old diesel generator which has had external modifications and now has issues running; it starts but runs badly. I am trying to narrow down what is installed and as there is very little information available, I am struggling with this. The alternator is 1.5 MVA, operates at 11 kV, is...
Hello everyone,
Might seem like a too basic question, but comes down to being new to doing arc-flash calculations. I am looking at IEEE 1584 and where it states that there are classes known as LV switchgear, LV MCCs and panelboards. Just concentrating on low voltage with this. This standard is...
Hi,
Can anyone share a copy of this old standard? I have switchboards built in Australia to this standard, but I don't have a copy of the standard so I can't see what it required. It looks like I could buy it, but it seems like a waste of money since it is otherwise a long superseded standard...
Looking at the attached photos, what's your first thought about what has failed? This cell set off an aspirated smoke detection early alarm. Heat damage (bad connection) or arcing damage (escaping from contactor) or something else?
I have a generator which has a cubicle on each side, one called the line-side cubicle (LSC) and the other called the neutral-side cubicle (NSC). Just thinking about the LSC, it has connections coming in from the generator bushings and goes through to the isolated phase busduct on the other side...
With three-phase rectifiers, does the phase rotation of the supply matter? I ask this because I have a series of battery chargers which are happily in service, but I will be taking them off their switchboard and feeding them with a diesel generator supply for a while. This allows maintenance to...
I am reading IEC 60079.14 : 2007 (ed 4.0. Yes I know there is edition 5 (2013) released and some corrections in 2016.
What I want to understand, is edition 4 (2007) the version where equipment protection levels (EPLs) were first introduced? This is for my understanding. The plant I work at is...
I have an issue with a transformer PLC style controller (specifically DRMCC-T3) that doesn’t see an oil pump contactor closing. The –T3 controller energises an oil pump contactor via a digital output and gets feedback via an auxiliary contact into a digital input that the contactor has operated...
