"The phone is a remarkably complex, simple device, and very rarely ever needs repairs, once you fix them." - Dan/Panther
Started by cloyd, April 18, 2016, 07:40:44 PM
Quote from: cloyd on April 18, 2016, 07:40:44 PMHi all,I need your input on a safety issue. The installation manual for my Panasonic 616 emphasizes grounding it. There is a specially marked screw on the outside for grounding. Can I ground it to the metal in-wall cable organizing box where I put the connections between Cat5E and the PBX? There is a grounded electrical outlet in there too. For that matter, the PBX electrical cord is grounded and plugs into that same electrical outlet. Is that sufficient? Surely, I don't have to take a grounding wire all the way to the grounding rod outside??? I am interested to know what others have done with their PBX boxes.Thanks,Tina
Quote from: andre_janew on April 20, 2016, 12:01:45 PMI've heard my dad talking about grounding his crystal radio set by clamping the ground to a copper water pipe. Could the same be done with a PBX?
Quote from: unbeldi on April 20, 2016, 01:02:17 PMThese Panasonic PBX systems don't actually have a "chassis", at least not what one commonly calls a chassis. The system is entirely constructed by mounting all components onto the plastic shell.So by that virtue there is never a danger for operators to touch metallic parts under high voltage.The installation manual states that the separate ground connection is to protect the system. It does not say to protect an operator.From looking at the schematics of the V2 and V3 KX-T61610 units, it appears that the ground terminal is direct connected to the ground lead in the power cord. From my pictures when working on units I see that this is extended with a few thick green-insulated wires to a couple of places on the large main PCBs.I think the extra grounding is provided to protect the unit from voltages entering through either the CO lines or the extension connectors, independently from the grounding through the power cord, which may perhaps not always be plugged in. On the other hand if someone has a miswired power lines on their premises, or doesn't bother to plug the unit in, why would one assume that they went through the trouble of providing extra grounding on the ground terminal.
Quote from: Phonesrfun on April 20, 2016, 09:32:03 PMI think this topic has been over analyzed. Yep, plastic case. Grounded plug. I don't think it needs any more special grounding than your average desktop computer. (Unless your house is an older one without grounded outlets. Then you might consider a ground because you might have some noise on the lines. Maybe, maybe not)
Quote from: dsk on April 22, 2016, 03:51:19 AMMany of us remember how sensitive the electronics was, regarding static electricity, proper grounding reduced this risk. In Norway we have had traditions of local grounding, with no common ground, and isolated power supplies (mains) with no Neutral. Telecom systems used to have their own ground rods, due to signalling via ground might be used, (grounded ringers, or a button connecting one leg of the telephone line to ground) The Panasonic do not need the last type of grounding so my guess will be grounding via the power system does it well enough.My mechanical exchange is grounded via a resistor to + battery. The resistor prevents the statics, and protects the unit against the first error if a live wire should touch the telephone wire. dsk