On 2017-08-08 03:22, James Knott wrote:
On 08/07/2017 07:47 PM, Carlos E. R. wrote:
Ummm... Neutral is *ALWAYS* tied to ground at the power entrance. Other
services are likewise bonded to the same ground point. Not in Spain, I'm certain of that.
It is connected, I understand, at the step down transformer, which can serve several city blocks.
That sounds dangerous. It could result in significant voltage differences between the powered device and local ground.
I have seen at most about 5 volts between neutral and ground. Leakage currents. I don't see any danger in the setup, at least from an "electrical" point of view. Electronics and communications... that's another thing. But Neutral is isolated from ground and chassis on all equipment. On the other hand, all houses in Spain have a residual current tripper, whatever the correct name is. If the current on live and neutral wires are slightly different (20 mA, I think), it triggers and switches of both wires. Ie, if live wire touches the chassis, or a person touches the wires, because some of the current goes back via earth instead of the other wire. -- Cheers / Saludos, Carlos E. R. (from 42.2 x86_64 "Malachite" at Telcontar)