Electronics > Projects, Designs, and Technical Stuff
What do you think of this NPFA20 compliant diesel fire pump panel?
dom0:
Routing 30 V working voltage ribbon cable in the same conduit as mains cables usually doesn't fly, because the basic rule is that the insulation of every cable in a conduit has to handle the highest nominal voltage in the conduit. That's why all bog-standard industrial control cables are rated for 300 V.
coppercone2:
--- Quote from: Neomys Sapiens on November 01, 2019, 11:51:25 pm ---Well, it might be perfectly legal, but I do not like the practice of mounting naked PCBs in switchgear cabinets like this one.
A certain form of build will cause the people to treat it in the same way. Like opening the cabinet and turning around with a extension cord swinging -BOP!- onto the PCB. :-\
--- End quote ---
that was a fight with management or an ass kisser behind that
also, no strain relief behind solder junctions to screw terminals. Its hooked on the cable management comb. Probably should have zip ties.
those screw terminals in the circuit breakers are press formed from solid metal, not bonded with solder. Its a different system that looks the same.
And I don't know about using an arduino as a riser board for a fire safety system is a good idea. It should be one board. Why is it done this way?
rvalente:
I do not like either the naked pcb, they could've add a small steel enclosure from laser cutting, cheap
The strain relief would be a good point, but I've seen various industrial controls (check S7 1200) has no strain relief either
I believe they've used the arduino to avoid sourcing more components, they could have just pasted the atmega ic on the board
German_EE:
I would have mounted the PCBs in plastic boxes with labels on the top saying what they do. I also don't like the idea of ribbon cables in the same trunking as mains cables.
coppercone2:
I thought this is a supply chain problem to use arduino because you cannot get them to manufacture more real arduinos on demand, only what is on market?
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