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Old 17th May 2022, 5:24 pm   #12
usradcoll1
Heptode
 
Join Date: Mar 2017
Location: Cedar Grove, Wisconsin, USA.
Posts: 823
Default Re: AC/ DC radios live chassis.

Quote:
Originally Posted by PJL View Post
AC/DC sets are not very safe under any circumstance but the T18DA does have a double pole mains switch so the side that switches to the chassis should be connected to Neutral. Many of the cheap imported USA sets have a single pole switch that disconnects the connection to chassis and if you connect this to neutral then the heater chain will make the chassis LIVE when switched off (only solution is to change the switch for double pole).
In the US, we're a little casual in our design of electrical products because of our low mains voltage.
Most of the radios exported to 220/240 volt countries, generally were the inexpensive makes using a resistive mains lead, which isn't very impressive.
Our listing agencies, such as U/L would not approve this design.
Dave, USradcoll1.
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