If your house has a modern RCB equipped distribution unit I would not worry about it.

regards Martin

Earthing is important whenever an appliance has a metal case because a live wire fraying or coming loose inside can electrify the outside of the unit. Very dangerous because metal cases provide a large contact area that greatly increases the current flow into the victim. Much worse than touching the end of a 2.5mm diameter wire.

An insulated case removes most of the risk, but care has to be taken to keep fingers out and to make certain control shafts, fixing screws and metal handles can't become live. Depending on the design, and earth might not be necessary.

Since plastics, many appliances come enclosed inside a fully insulated box. The risk of shock from these is minimal, and there's nothing users can touch that can to be earthed. The internal design also reduces the hazard in various ways. Earthing these does nothing useful.

Earths remain vital on metal appliances, but I suspect the majority of house appliances these days don't need or have one.

Signal and safety earth requirements are so different as to be almost two different subjects! I think it's safe to assume Pioneer understood both.

Dave

Hi Swarf Mostly!, if you have Phono inputs on your amplifier, you should have the Earth post near to where the inputs are. Transcription decks (record player) with a magnetic pickup should have a thin wire with the phono input/output leads, this is done this way to prevent earth loop hum. The common connection from the pickup is totally insulated from the deck's metalwork and the thin wire, earth's the metalwork of the deck directly, rather than taking the long route round via the earth pin plugs, my Pioneer PL-3000 has only a twin mains cable and nothing on the users side has any connection to the thin wire and I've seen this with other decks with magnetic pickups, that I have had in the past. Although my Technics SU-3050 shows no earth connection through the mains plug on the schematic diagram, there is in fact a three core flex connecting it to the mains even though there is an isolating transformer that is the only part that connects to the mains.

I think both these where made before double insulation became more of the norm, as both the CD players plugged into the amp only have a twin plug-in mains flex and my double cassette player/recorder also only has a twin core flex connecting it to the mains.

Regards Nick.

Edited By Nicholas Farr on 28/04/2022 11:57:07