Originally Posted by Glimmie
This will get Gregzoll al fired up about safety but it's true.
On facility I worked at had a stage audio rental facility next door. They would often coil up the speaker cables on the sidewalk. The were standard 12gaSO electrical wire with standard 120v 20a twist locks. We asked one of their engineers about the choice of connector and safety. He replied something like "what damage? It just going to make a loud hum!" And he was right when you do the math. Those massive speaker arrays could take 1800 watts all day long.
Do not know what you are talking about. My day to day job in the Navy was dealing with 400 amp Ship to Shore cables, that while in the yards at Philly, we could set our watches by, when they would go into a thermal runaway and catch on fire.
Really in live production, unless you have people going back and forth over the cables, you can get away with them being coiled on the sidewalk, but still have to take some kind of precaution, to keep people from dragging equipment over them, or walking on top of the coils, which if they do not pay attention, would be a "Have a nice trip. See you next fall.".
1800 watts, is puny, compared to the wattage I dealt with, for on board PA communication. You could run a concert with the huge Tube amp cabinets we used for flight deck ops, and main operating and living spaces com's.
At least there is something I can agree with you. As for the other subjects, yes it gets touchy, but we both should have just bowed out, but I think that both of us really have meant well in what we have posted in our opinions, but really have different approaches. I just do not agree when it comes to the fact that there are too many out there that fully do not understand the whole ground to electrical issue. Especially if you have not worked physically on electrical systems with communication circuits, and just only deal with it in books or on paper, you do not see it in a real life view point.
Ground loops are a PITA, and the best example I have used for when I tell people, is find some of the old recordings of when performers were playing at Woodstock. The one thing that they constantly had to deal with, due to the wet conditions, was bad grounds, ground loops, ground hum, which actually they used the hum in their favor. You could not walk around the field at Woodstock, without feeling the electricity flowing through the mud, and could not touch anything, or you got shocked, due to poor electrical practices, and it was just a hurry up and get everything done, no inspections, just deal with it.