research
 Patents
 Books
 Literature
 Articles
 Timeline
 Auction Archive

about
 About this site
 Wanted to buy

bulb gallery

Incandescent:
C
carbon
WD
drawn tungsten
WC
coiled tungsten
WM
mini tungsten
WS
pressed tung.
FG
figural bulbs
XL
christmas
XS
christmas sets
T
tantalum

Discharge:
NE
neon lamps
AR
argon lamps
XE
xenon lamps
MA
mercury
MC
fluorescent
MS
special mercury

Hardware:
F
fuses
FX
fixtures
PF
plugs & fittings
SA
sockets
SW
switches

tube gallery

 X-ray
 Geissler
 Crookes
 Radio
 Box art

museum pics

 Dr. Hugh Hicks
 
Fort Myers, FL.
 S.Slabyhoudek

links

 Related links
 Submit a link

 

Author Topic: Antique Dc Wiring  (Read 14625 times)

Offline bulb10

  • New Member!
  • *
  • Posts: 1
Antique Dc Wiring
« on: February 06, 2009, 04:49:57 pm »
In edison days and in places that have the rare antique direct current supply how are the switches,plugs,fuses,wiring and operation including the hum are like as compared to the later alternating current systems in general?

Offline adam2

  • Hero Member
  • ****
  • Posts: 108
Re: Antique Dc Wiring
« Reply #1 on: April 23, 2009, 10:09:59 am »
Wireing for direct current is generly the same as for AC.

In years gone by, the switches and outlets were also the same as used for AC, but these days most switches and socket outlets are only listed for AC operation.
Years ago switchs and sockets were marked AC/DC indicating suitability for either system.

Direct current does not normally produce any hum or other noise.

DC is used today in off grid homes, being obtained from batteries charged by solar modules. The voltage is normally much lower than DC mains supplies, 12 or 24 volts often being used.
In theory such systems should use special DC switches and outlets, in practice standard AC ones are used and work perfectly. In general, a switch marked "AC only" can be used on DC ,provided that the voltage is limited to about 10% of the rating. Therefore a switch marked as being for 240 volts AC only can be used on a 12 or 24 volt DC system, but certainly not on a 240 volt DC system.