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Hi All, We have designed some intrinsically safe instrument loop circuits where the sensor is cabled from the main DCS panel to a field panel just outside the hazardous area (in the safe area) where the intrinsically safe barriers are located. This then supplies the instrument in the hazardous...

Hi All, We are currently completing some feasibility designs for some mobile mining units for a Client of ours. We have done similar units before where the transformer was located on the mining unit and powered via a 6.6kV trailing cable. In this case, they want to have an offboard 22kV/433V...

Hi all, We are completing a project for a client of ours for 2 x 3.4 million litre storage tanks and have to classify the zone in the tank. As diesel is a combustible and not flammable this normally would negate the need for classification, but there are a lot of differring opinions on forums...

Hello All, I am working on a series of 3 mining units which are not mechanically connected (i.e. about 3m apart) but need to move in together at the same time. They are each about 3 stories high and 50m long and move along on caterpiller tracks and are fully manually operator controlled. The...

Hello All, I am working on a series of 3 mining units which are not mechanically connected (i.e. about 3m apart) but need to move in together at the same time. They are each about 3 stories high and 50m long and move along on caterpiller tracks and are fully manually operator controlled. The...

Hi All, A friend of mine asked me these questions, and I though seeing as I only have a general knowledge of the area I would throw it out to the Gurus: with vsd's how is the inrush current reduced during startup at low speed/frequ? Also, for a standard motor, can you exceed the absorbed...

Hi All, I am in the process of updating our business software. Currently we use Quickbooks for invoicing/etc and am looking to get another software package which tracks projects, labour, materials, etc and let me see where everything is at (including financials, etc). We are looking at...

Good Evening fellow engineers and intellects, I am currently working on a project where I have 3 large mining machines which process mineral sands. These are about 4 stories high and weigh about 400 tonnes each, running on caterpillar tracks (I have attached a picture to give you some idea)...

Hi All, I am doing the preliminary design for a mobile mining unit and trying to work out what to do with the earthing. The unit is running on tank tracks and moves about 30m every 3-4 days. Onboard there is a trailing cable running from an external cable reeler to a 6.6kV RMU (which also feeds...

Hi all, I am just curious of the effects of using AC MCB circuit breakers for DC applications (i.e. using a 4 Amp C-Curve AC MCB to protect a 24VDC control circuit). I am aware of the arc extinguishing problems at the high end of the scale but am curious (mainly because of the price difference)...