A Demonstration Of The Standard For Industrial Control Panels



what we have here is a cabinet that's been constructed to meet the and standard for electrical assemblies ul5 Oh a a this is a demonstration panel it's got lots of ingredients and it's that you would typically see in such a control cabinet so what I'm going to do is open the door and show you what's inside so first of all I have to switch off the isolator okay so the first thing you might notice is this floret this interlocking section on the inside that you wouldn't typically see on a european-style isolating switch this is the main switch for the cabinet it's two UL four eight nine and this handle is we call it an NFPA handle and it allows you to switch the isolator on and off from within the cabinet but the regulations say that it mustn't involve the use of an additional tool and it must involve a deliberate action on behalf of the person doing the switching so this handle will freely rotate but if I understand how it works I just pull it forward and know I can turn the switch on turn it back off again if I let go then it becomes safe again so that's if you're using a rotary isolator in this kind of assembly you have to consider that kind of handling is a requirement in this top section here what we've got is a variety of motor starters and feeders these are type II or f motor starter assemblies so they're known as self protected motor controllers in the North American market so of circuit breaker contactor overlord or just a multi protective circuit breaker and a contactor interesting differentiation here in Europe we'd call all of these things motor protection circuit breakers we'd say that's a magnetic only one and that's a thermal magnetic one in the US market a thermal magnetic device is known as a motor protective circuit breaker a magnetic only device is known as a motor circuit protector those are things that you'll hear quoted quite often so here all mounted on a one-for-one air buzz bar system that's a 60 millimeter cen Center buzz bar system so that again makes the you our requirements here we've got a variable speed drive we've got a soft start we've got a few switch using J type fuses we've got a small feeder using fuses and here we've got a circuit breaker perhaps feeding an external circuit with a transformer something like that okay if we move on to this second section here you'll see this is far more typical of a european-style control cabinet the sort of thing you more familiar with again main switch has got this NFPA style handle on it so that you can operate it with the door open without additional tools this time it's on a switch fuse units so switch views with J style American fuses in it again we've got these self protecting motor controllers type e and F so motor protective circuit breakers in contactors and we've got a few fuses this time all assembled onto a dim rail or dim rail is a European idea perfectly acceptable in the UL world as long as it's used to the appropriate standard you might notice on the end this miniature circuit breaker is looks a bit unusual it's a 489 miniature circuit breaker so it meets the UL 489 which means it can be used in branch and feeder circuits standard European style miniature circuit breakers probably best avoided but certainly can't be used in branch or feeder circuits it's got to be a UL 489 breaker if we move on to this third section these are mainly control circuit devices but we've also got down here a micro PLC I mentioned this circuit breaker you can see that it's got yellow cables that's because it's taking an external supply at 110 volts here protecting it and then feeding this domestic domestic style US socket here so if you've got someone coming in to do some programming on the micro then they can plug the laptop in now it's convenient for them but the wire colors are all covered by UL 508 a if you look into the standard then there's a there's a color code that tells you which cable to use for which application one other interesting thing there are a couple of power supply units in this section this one is a class 2 power supply which means it can be used in limited energy applications at 24 volts DC in fact any voltage up to 40 volts but in this case 24 volts DC and it's got a limited output of a hundred VA so the devices that are connected downstream of that don't have to be considered for the UL standard they can be proximity switches for two cells things like that but because they're in that environment downstream of this power supply class 2 power supply they don't need to be considered so very difficult to give you much more information about meeting North American standards in such a short video if you want to know more if you go to Rockwell Automation comm and search on North American standards then you'll find more videos you'll find more information publications and details of where we are holding one-day seminars that you can intend and and learn some more

4 Replies to “A Demonstration Of The Standard For Industrial Control Panels

  1. Wow great information! Thank you!! – I look forward to learning more about making UL compliant control cabinets. – I wonder if I can find an online training course for cabinet making.

  2. How can you see what went wrong during trouble shooting if you have to switch of the power before opening the panel?

Leave a Reply

Your email address will not be published. Required fields are marked *