Recent content by bomjac

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    Bolted connections for busbars

    The only correct tightness for any bus are connection is the manufacturers recommendation. Over-tight can be just as dangerous as under-tight as the contact area of the busbars can become deformed and too small causing excess heating at joints. use a torque wrench and set it to the correct...
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    Offshore/Drillships agencies that take on without offshore experience?

    I don’t know drill ships, but you should be ok for drilling rigs. Tankers and cable lay barges may require STCW (mariners equivalent of BOSIET), but I never worked on them so I’m not sure. Be prepared for a lot of calls, emails and refusals till you get the first shout. Took me almost 4 years...
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    UK Anyone use a dual sim phone?

    Been using dual sim for about 5 years. Samsung S5 initially, and now S9+. No real issues, but my S9 atm doesn’t play well with 4g and calls in Saudi, so half the time it is set to 3g. Easy to swap - when I get back to Europe it literally takes 20seconds to change the default for calls/data...
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    UK CompEx training centre near London?

    The center usually will send you some preparation material before the course to read before you go. There is a Facebook group called “Compex Electricians” that has some exam practice and course notes on the files section. Sign up there also. It’s not difficult, but it is intensive. Pay...
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    UK CompEx training centre near London?

    Check below for a list of the centers. There seems to be one in the London area. As to the quality of its training - I have no idea. Most of the centers are around the oil / refinery plants. Teeside, Falkirk, Aberdeen, Manchester and Hull all spring to mind. CompEx | CompEx Centres -...
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    Do I need over current protection?

    Fuse it (or use MCB) upstream of the starter to protect the equipment from short circuit, and use the overload to protect the motor from overload. You can use a combination MCCB for the complete protection provided it is of the correct type and is adjustable to the nominal motor current. In the...
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    Electrical Commissioning

    Test & inspect, Compex (which I assume you already have) and HNC / HND would stand you in good stead. HV switching is nice to have, but without experience it’s pointless to shell out £1500+ on it. Very difficult field to get into as it is basically a closed shop. Commissioning lead gets on...
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    Earthing across flanges

    “Hot-Bolting” is a very common practice in the oil industry, prior to a shutdown or pipe changeout. Basically the pipe fitter will change every bolt in a flange, one by one until they are all swapped out for new. It means that come the shutdown they can change the spool or gasket etc quickly...
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    Busbar Ductor Testing

    Modern Ductor tester, takes 10s for each test. All stored internally and can be downloaded to PC. Compared to the amount of faffing about making shorts, calculation and repositioning the shorts, I know what I would be doing. The only issue I ever found with busbars was over-torque...
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    Compex Ex 01 - 04 course help (notes & advice)

    Join the facebook page "Compex Electricians". You will find some very good exam questions there. The exam is 60 questions in 2 hours, so you need to know at least 50% of the questions by heart.
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    Ampacities .... is this even a real word

    Actually, raceway is a common term for an “enclosed cable way”. Generally what we would call trunking. They do tend to distinguish between raceways and conduit tho. Their standards are pretty much as un-interesting as ours but the NFPA 70E handbook is pretty good. Just don’t get me started...
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    Earthing and protection course. EA Technology anyone been ?

    If it's "earthing" as in principles for grounding, ground rods etc then Megger have a very good document available online. Search for their "Ground Loop Testers". Even their book about Insulation testing is worth a read. "Protection" if you are talking about circuit protection (ANSI codes 50...
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    DC circuit breakers VS semiconductor fuses high speed.

    Circuit breakers and fuses for general use both toperate on the principle of Inverse time curves (IDMT). The higher the over current, the quicker it will trip. Conversely, at lower overcurrents it will take longer to trip - a circuit breaker may take 10 minutes to trip at 1.2* rated amps (if...
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    CompEx course advice

    Stay off the beer at night would be my best advice. It's a pretty intensive course. Some training providers will send you some pre-training info to read. Pay attention to what is taught, study the material given and ask questions if you are not sure. Lots of questions. From memory there...
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    Cable Sizing 2.2kw motor

    From memory, the volts drop on starting the motor should not exceed 10%, and starting time should generally be <3.5s. You cable needs to be sized to allow for this. So your voltage drop calculation has to be for the starting current (12.5A or 30A depending whether Y or delta connected). The...

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