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Hi i am reposting this question in the polymer section with some updates. i have a clear polycarbonate camera housing ( the one you put a professional camera in it and take it deep underwater. its rated to 60m depth ). i found 3 tiny surface cracks each of 2-3 mm long around one of the control...

Hi i have a bit of unusual question. i have a clear polycarbonate camera housing ( the one you put a professional camera in it and take it deep underwater ). i found 3 tiny surface cracks each of 2-3 mm long around one of the control glands penetrating the housing wall. i know its surface...

what are the machinery required for a MS flat bars production line ?

Hi i am planning to build a steel flat bar production line of capacity 20 Tons/day. the plant uses scrap steel as raw material to produce flat bars of different sizes. what are the suitable machinery and process stages for such line ?

Hi does any one have this book ? i am thinking of buying it but i need to know your review first. Electric Motor Repair by Robert Rosenberg & August Hand http://www.amazon.com/Electric-Motor-Repair-Robert-Rosenberg/dp/0030595843

Does the IEC states that lighting in metal rooms or enclosures should be 24 V not 220 VAC for safety reasons?

how can I measure rotor current in running slip ring AC motor ? I know that usual clampmeters can not measure low frequency current ?

what is the recommended tests that should be performed on MV slipring motors?

What is the recommended ground resistance for a lightning protection system? i have a system consisting of 3 lightning rods connected to network of 4 earth rods and the earth resistance measured is 1.2 ohm. where is that from the standard?

i have a two secondary’s transformer 132/6.3/6.3 kV 60/55MVA ONAF/ONAN at 50% loading on both secondaries, the top oil temperature is 60 C, winding 62 C, ambient 27 C. is this considered high temperature? IEC standard says that temperature rise is 60K, 65K