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jimgineer said "I've never seen orange equipment but I have seen plenty of examples where for some reason clients put the aesthetics of a project as a higher priority than the functionality of it." So true, once worked on a project where the Architect wanted the fire alarm break point changed...

In the UK you would need the tables in BS 7671:2008. Requirements for Electrical Installations. Also known as The IEE Wiring Regulations 17th Edition. Regards

In the past when I have worked on cranes with dc motors the 'power' wired in black was the from the variable speed drive to the motor, that is the high current circuit. The control element also in dc but at 24v dc would be control wired in blue. Hope this helps

Franklymdear, I think you are refering to tripping curves. Standard is BS EN 60898, it think I don't have books at home to check and the memory is not what it was. A breaker with a B curve has a magnetic trip 3 to 5 times Rated current (In) and is typically used in domestic type installations...

By 'positive acting' I understand this to meant that for example if a guard limit is operated the switch contacts are positivly opend. In many limit switches when the pressure is taken off the actuator arm the contacts are opened by a spring. A 'positve acting' switch contact is pulled apart by...

Slava, Rather than a long text here are links to two types of tunnel power supplies from our tunnel solution guide. http://i34.tinypic.com/k32m9u.jpg http://i35.tinypic.com/2cr7uwn.jpg I must stress these are are a high level overview rather than actual systems but they should provide an...

Slavag, Can you provide a little more information. Is it a road or rail tunnel, how long? Is it a single or multiple bore? What avaiability is required from the power system? Will the power system be required to operate for a time in the event of a fire for evacuation purposes? Once this...

I'm starting to look at Power distribution systems both MV and LV requirement is similar to Data Centre Tier 4 but a different industry. The IEEE Gold Book has been recomended as a good starting point. I'm not going to do the detailed design but be involved in the management of the process. I...

Even if the case can be made for having the same hardware used for the main control & the safety system. One factor to consider would be the cost of engineering the system. If both functions are in the same system I believe you would have to design the whole system to the higher level. So if...

Google found ISO 4308-1 : 2003 Cranes and lifting appliances -- Selection of wire ropes -- Part 1: General That is all the help I can give. Having worked on big cranes I just know to keep well clear of ropes!

ScottyUK, Tried that, I found some info on the isa.org page but this is mainley papers abbout it's application not the basics.

Can anybody point me to information on "Smith Prediction" I'm told that it is a variation on 3 term control that can look forward to what will be happening in the future. I can find many articles that refer to this but not a publication that gives me the basic information. As ever I need it...

Thanks Gents, IRStuff, you're right I should have explained, I assumed people know what they are. We all know how dangerous assumtions are I should have known better. PLCs are a software based controller originally for relay replacement but now much more powerfull and wide ranging. The two...

I've also put this query on the Engineering History Forum but thought I would try here as well I'm writing a paper about the development of programmable controllers and looking for any published information from about 1968 to 1976. I have searched the IEEE & IET(used to be the IEE) catalogues...

I'm writing a paper about the development of programmable controllers and looking for any published information from about 1968 to 1976. I have searched the IEEE & IET(used to be the IEE) catalogues and the first reference I can find is an IEE Colloquium from 1976. I have a copy of Dick...

The document they refer to CAP 437 is a UK Civil Aviation Authority document for offshore helicoptr landing areas. If the helicopter platform is licensed by the CAA this is the document that has to be followed. You can download a copy, free, from http://www.caa.co.uk/docs/33/CAP437.PDF Chapter...

I've made a couple of assumtions, always dangerous but we have to start somewhere. a) Your in North America b) You have one breaker , two contactors and two overloads. The standard I work to is IEC 60204-1 Safety of Machinery - Electrical Equipment of Machines. I'm told that NFPA 79 is based on...

I forgot to say I will see what I can find in the standards & installation regs

Can you tell if both motors will ever work at the same time.I have seen this on larger cranes where there have been two motions that can never work together and they have similar sized motors. You have one breaker, one vsd and a pair of contactors to select the required motion. However these...

Try this site http://www.selectron.ch/wEnglisch/index.php they manufacture automation for rail vehicles. I don't know about in the US but in Europe I believe there other restrictions regarding automation on rail vehicles. One I belive is that you cannot use red LEDs for I/O status Hope this...