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ah well er um ..... few words can describe that workmanship (that can be printed in public.) This is why most industrial projects specify crimped terms. If you are OEM then you are just buying warranty claims , If you are client side then YOUR projects are going to be unreliable with...

JacksonJim split this into 2 issues 1. a cable was tested and there is debate around the voltage used..... more later 2. A cable was tested and passed the test - I am not keen on the voltage the test was done at BUT IT PASSED and was good when the meter was disconnected. -I hear "the you...

Thanks desertfox, jghrist, Kiribanda I really appreciate your responses. It would seem we can give a little push back here and ask to use the available materials (desertfox, these are laid very loosely in the trench and covered with conductive sand & soil mix there should be no creep or forces...

Hi All We are building a 132KV/33KV substation. The designer has specified the conductor for the grid to be 150mm2 uninsulated multistranded HD copper. The inevitable supply issues has drawn out the response " we have lots of annealed available lets use that" we have not done so (we'll wait for...

hi all I live under a different set of rules awhere limits of approach are set for all access to area. So this conversation is acedemic to that but lets take a step back - You & I have a duty of care to all in our charge & those around us. If we dont have enough ppe for the tourists then they...

hi all Pete ,as usual, is on the money again. But here it is straight from my physics text book (which is soooo old it is a national relic) PROBLEM: a plane weighing 5000kg can climb vertically at a rate of 200km/hr. What power is expended. (9.8m/s) SOLUTION: power = work/time = (force x...

hi all at the risk of sounding trite the simple fact is this is a PID controller. It is bad practise to use an auto setting of 0 to force the output to drive closed. You will have an indeterminate position occuring and the controller will ramp (yes reset windup) to some undefined position. AND...

how about looking at itsmoked & pluckers sensing ideas?. - something like a coil or pick up on the side of the motor. It should be as noisy as hell when moving and quiet when not. Amp or switch the "signal" back to the PIC ? but:- enjoy trying Don

hi all It is implied that you have analog inputs for both flow & pressure . If not get it. From this point the spread of pressure / flow rate is quite calculatable. If you have a pipe rupture the pressure will fall below a deviation alarm and alert your operations. If the pipe is blocked or...

unclebob & cuky2000 Thanks guys - a collective "ahhh yehhh that's right" has eminated out of the office and now there are dull thud sounds as reference books hit the desks. your replies really appreciated and have stimulated a lot thinking here Don

We have a list of suitable transformers for our job but the vector designation has us scratching our heads. What does "Dyn11" mean. we assume "D" = delta primary "y" = star secondary with nuetral but what the is "1" or "11"? knowing we make look a little sheepish but thanks in advance

oh yee of little faith!!! now my grandad dint think that new fangled eltrizinty stuff could amount to much. you know pushing smoke thru wires how's that gonna cure any ills. but then again I dont think I'll buy shares either (ps it's obviously smoke cause every time you break the wire theres a...

thanks all True to form this gruop of dynamos has the answers. (that is a really bad pun, hey?) Marke,that is probably the bit our debate was missing again, thanks

We have been having a discussion on the relationship of load and power factor in squirrel cage motors. Generally it is agreed that pf. improves as the load approaches 100% BUT nobody can find a graph or curve on paper. Does anyone know of a site or link with this available. We have done a bit...

oldpfart seems to be the closest to my guess. The modicon could well be one of those PLCs that only support integers. You are incrementing a data register for each unit passed. If you check the manual you may well find that the maximum value for an integer is 65535If this is the case look to...

ecreek & co are right it is underwriters laboratory but be aware that they are a quality systems auditor and accrediting agency. They will support clients for ISO QS AS and nearly all the international standards and as such thier mark is copyright and is used on many a business card to show...

electricpete a stab in the dark. What if we are considering a pipe cicuit that has an inherent run back flow when the pump shuts in or that the circuit is pressurised and so put some extra load on the pump when we change over. would the water pressure rise with temp quickly if flow was...

hi all a small observation on my part. In Japan the mains voltage is notionally 100V ac In the USA it's notionally 110V ac In Australia it's notionally 240Vac Now people get killed every year by the 100V, the 110V, and the 240V. The are ALL lethal. The systems around them protect the people...

ggpie It's possible your contact is refering to either:- a) changing direction while the motor is running down. if you try to reverse the direction while the motor has an inertia then your start or inrush current is going to be heaps higher than planned. This is why zero speed switches or time...

pederson I believe the readson for hydrogen and acetelyne to have tighter curves is due to the higher level of flamability. What I mean by that is it takes a very small amount of energy to ignite a combustible mix cotaining these gases rather than say petrol vapours. This is also reflected in...