QUOTE(ozak @ May 3 2014, 06:40 PM)
It look like some loose contact and the heat fuse the socket and the plug pin. It also melt the plug and the plug hole loose. Once you pull the plug out, the pin remain at the socket.
The bzzzz sound is the loose contact sound. Where the spark jump to each other contact. This spark produce heat.
It is not advise to always plug and unplug the aircon to share. The contact will loose in 1 day and result is like your picture.
If you want to share, the condition is, the sharing equipment is not high power usage. Anything cannot be over 1500w. Aircon + equipment cannot be over 2kw for long running.
Than to loop it for aircon, Don't use plug and wall socket. Use the 20A switch. Main wire must go to 20A switch first. Than loop another pair of wire to the wall socket.
hi, can clarify on the 1500w, and total should not exceed 2kw? just want to make sure.
we assuming the wiring is only shared for that socket plus the additional loop, 1500w would convert to 6.5A (assuming 230V), 2kw is around 8.6A, the sockets are rated for 13A each, the wiring 2.5mm2 should be rated close to 18A-21A, with the MCB tripping at 20A. so even with 2kw it's still has around 30% safety margin from it's designed 13A limit.
unless i got the W to A conversion wrong do correct.
1hp inverter AC nowadays consume around 4-5A (based on their input W). but generally AC uses 20A double pole switch, 4mm2 wires to 20A MCB.
cooking hob consume alot more power than 1hp AC, yet most contractors give the same spec as the AC (20A switch/4mm2 wires/20A MCB).
the one thing different tapping AC from existing socket vs dedicated line is AC wiring to DB normally runs on the 100mA RCD, while sockets runs on 30mA RCD, whether running AC on 30mA RCD has any side effects?This post has been edited by advocado: Jan 2 2018, 12:05 PM