We have an air compressor that is presently in a NEMA 12 enclosure. We need to move it to the outside pad and it will therefore require the enclosure to be NEMA 3R or 4. Anyone have any experience with enclosure retrofit kit options or other suggestions. Trying to avoid a wholesale...
Thanks for all of your inputs. I was never really a proponent of the barrier implementation for exactly the reasons cited by jraef. We are currently pursuing obtaining a standing EEWP per Zogzog's recommendation. We are hopeful that our customer will be receptive to that strategy.
Thanks again.
electricpete, generally speaking, your definition of a hot work permit is probably more correct. Likewise, when dealing with Class 1 Div 1, 2 areas. My particular situation is at a customer's site, and it is they who define hot work in the context of working on energized equipment.
arj3090, your youtube video was excellent. I just came off of a project where I used an off the shelf HMI product with its own programming environment. It is super slow.
I'm thinking that we'll probably put a new SCADA front end on this system. So, a couple of questions for you:
1. I have...
I have an enclosure (72Hx68Wx18D in.) containing 2x40 HP VFD's fed with 480VAC/200A. Given the increasing (and real) concerns regarding Arc Flash hazards and associated NFPA70E requirements, we are confronted with major hurdles in order to service this enclosure. From time to time, we do need...
I am installing an HMI in the door of a NEMA 4 enclosure. The panel will be located outdoors. Most of the NEMA 4 rated HMI's that I've come across are rated for indoor use only. I assume that sunlight glare and UV damage are the main reasons for limiting them to indoor.
Anyone have any...
I wanted to thank all of you guys for your valuable inputs. I started to consider the one drive approach because we had some space limitations. I can see now that dedicated drives are the right thing to do. Cycling the pumps to ensure wear averaging was also great input.
Skogsgurra, this is a...
I'm putting together a system with two 40 hp pump motors. One pump will function as the primary, and the secondary pump will be used as a standby in the event that the primary fails. Both pumps will never operate at the same time.
I would like to use a single VFD for both pumps and install a...
