Dating Old Electrics
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Some dates - but may contain errors, and sometimes things did get installed later than they should strictly have been.
- Lead sheath cable: before 1948, except on farms
- TRS (Tough Rubber Sheath) 1945-1962
- Capothene and Ashothene sheath cables: 1952 - 1960
- PVC inner PVC outer T&E style cables with no cpc (lighting circuits): 1955-1966
- Imperial PVC cables: 1955 - 1971
- 2.5mm PVC/PVC T&E with 1mm cpc: 1971 - 1981
- Twin twisted flexible cords: before 1977
- Rubber/PVC mix T&E cable: 1958 to 1961
Earth wire in cables:
- Separate bare copper earth wires run alongside twin cable:
- Black earth conductors: before 1966
- Green protective sleeving: before 1977
- Green & yellow earth sleeving: 1971 onwards
Main earth bonding:
- No main equiptential bonding conductor: before 1966
- 2.5mm main equipotential bonding conductors: 1971-1972
- 6mm main equipotential bonding conductors: 1966 - 1983
- 10mm main equipotential bonding conductors: post 1983
- ELCB (Voltage operated circuit breaker): pre 1981
- Double pole fused switchgear on ac Installations: pre 1955
- Wood backed Wylex fuseboxes: still being installed in 1983
- Slate fusebox with bare screws for fusewire links: in use in late 1800s, obsolete by the 1930s
- Wooden box with wooden lid fusebox: standard in 1930s
Sockets:
- Accessories mounted on wooden blocks: before 1966
- Round pin socket outlets: mostly before 1955, but sometimes used much later
- Square pin 13A sockets: post 1945
- 2 pin 5A sockets:
- No sockets upstairs: