Latest tube light is there in the market with central eye KR IRS On Wed, Oct 26, 2022, 6:17 PM 'gopala krishnan' via iyer123 < [email protected]> wrote:
> SWITCH- PART 2 > > Dear friends, this is 2nd part of posting about switch and related > subjects. This is in continuation of part 1 of the posting. There was > correction in serial number in the earliest posting. 10 Paragraphs had been > completed in the earlier part. This part is continuing with Para 11 > > Gopalakrishnan. 26-10-2022. > > *11. Fixing of switch.* > > In house wiring mostly the fixing of switch is done in teakwood box. > However present day extension boxes use quality board. Till date EB > connection, meter, main switch etc. are on a power board. In new homes the > board is provided with cover. One can see the bare copper wire of Earthing > inside this board. > > The earliest wiring was on teak wood and wires were fitted on batten using > link clips. Later wirings were in conduit pipes, initially metallic and > later PVC. Present day wiring is concealed with in RCC on top, along walls > and through concealed wooden/ Teak wood boxes. These boxes are fitted > inside the brick wall breaking the required thickness. Either these breaks, > or breakings to lay PVC pipes do not affect building because the homes are > built on Pillars. Over the teakwood box lamina with cutting is provided and > switch only is seen outside. > > In old buildings one can see outside conduit. Even now much external > wiring is done through PVC conduits to the bore well motor, sump motor etc. > > > In earlier wiring using conduit in the walls the switch boards were > fixed protruding from inside wall. The top of these boxes were sometimes > used to keep keys etc. for convenience. > > Batten wiring has reappeared with in home when new power points are added. > Present day PVC battens have closing batten after the power wire is drawn. > PVC conduit wiring also has appeared inside walls for wiring CCTV etc. > > At one time thick PVC boards were used instead of teak wood, but it was > not appreciated much. > > *12 Earliest switches* > > The earliest switch which appeared in India was *Tumbler switch*. Switch > was larger in size with porcelain base and thin Bakelite top. Switch box > and switch were protruding the wall. Depend on the circuits the size of > switch box changed. My ancestral home in native got electric power > connection in 1963. All switches were tumbler switches. Tumbler switches > continued for long period. For years they worked without trouble. > > While I constructed my home in native during 1980, still tumbler switch > was used in bath room and toilet for safety, though piano switches had > appeared by the time. > > It is still not understood why plug points were not provided with switch > and remains a mystery to me. > > On those days all switch boxes were fitted at hand reach of elders. > Children could not operate switch. Still there were naughty kids who used > to move stool/ chair and stood on it and operated switch. > > On those days electric supply was for lighting bulbs. Fan was not > affordable during 1963’s in homes. I recollect staff room and class rooms > had fans in my college at that time. > > *13. Piano switches* > > PVC body switches appeared in house wiring these types of switches called > piano switches were introduced. In phases tumbler switched appeared. > Cutting was made in the switch board for each switch very tactfully by > electrician. Switches came in flush with the switch board. These switches > had markings for fan, light etc. in color. These identifications > disappeared in one or two years and people got accustomed to operate the > concerned switches from practice/ memory. > > *13a Bed switch* > > One of the switches appeared was bed switch. For relaxing in bed and > reading in the night through temporary wire an additional switch was > introduced. This enabled person relaxing in bed and on getting sleep > operate the switch to switch OFF the light. It was common on those days a > person visiting asking where is bed switch, while visiting the room. > Gradually > bed switch disappeared with a switch box near bed and lamp switching OFF > lying in the bed. So the fan/light had two switches. This continues even > today. It is a type of stair case wiring. > > *14 Appearance of tube lights and fans.* > > Gradually tube lights appeared in 2 feet length and 4 feet length. Fans > appeared and gradually most homes installed fans in halls, bed rooms etc. > Because of the pleasant light in many places bulbs were replaced with tube > lights or tube lights and bulbs were separately provided. > > Tube lights would suddenly flicker and at that time bulb was the > substitute. Earliest tube lights were suspended from the top, tube lights > had a shade and there was a chock and starter. Later tube lights started > fitting on walls, shade disappeared, electrical choke changed to electronic > choke and starter disappeared. Now we have LED tube light which is a single > unit and very less in weight and wattage is around 25. The earlier tube > lights were 40 watts. > > The first appeared tubes had larger diameter, later tubes appeared with > lesser diameter. Electrical chokes have disappeared, starter has > disappeared, still smaller diameter tubes, and electronic chokes are still > appeared. > > *15 Regulator switch.* > > Fans had larger regulator. It was provided on top portion of the switch > board. Even now such regulators are available in electrical shops, slightly > reduced in the size. > > *16 Switches for motors and water heaters* > > For lifting water from the well, higher current is required. For water > heaters high current is required. So separate large size switches appeared. > These switches were installed in separate switch board. > > *I will continue in next posting* > > -- > You received this message because you are subscribed to the Google Groups > "iyer123" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/iyer123/1812402928.274506.1666788451036%40mail.yahoo.com > <https://groups.google.com/d/msgid/iyer123/1812402928.274506.1666788451036%40mail.yahoo.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Thatha_Patty" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/thatha_patty/CAL5XZoq7cgfHgrVnLikrjaf5%2BAO6c1EmSgOOoNsnWwDS_vs%2BWQ%40mail.gmail.com.
