![Works photographic negative of cables on wall, Balham substation, London Underground | Science Museum Group Collection Works photographic negative of cables on wall, Balham substation, London Underground | Science Museum Group Collection](https://coimages.sciencemuseumgroup.org.uk/images/247/647/medium_1972_36_NEG_1563.jpg)
Works photographic negative of cables on wall, Balham substation, London Underground | Science Museum Group Collection
![Cables Concealed in Walls or Partitions: The Case for Additional Protection by Residual Current Devices - Professional Electrician Cables Concealed in Walls or Partitions: The Case for Additional Protection by Residual Current Devices - Professional Electrician](http://professional-electrician.com/wp-content/uploads/2018/01/021_PE_DEC17-copy.jpg)
Cables Concealed in Walls or Partitions: The Case for Additional Protection by Residual Current Devices - Professional Electrician
![1STec 3m Underground Cable Conduit Ducting Hose Pipe Channel for TV Coax, Electric Wire, Garden Lights, Fish Pond Low Voltage Pumps, Power Socket Lead Burial (3 Metre, 20mm External 14mm Internal) : 1STec 3m Underground Cable Conduit Ducting Hose Pipe Channel for TV Coax, Electric Wire, Garden Lights, Fish Pond Low Voltage Pumps, Power Socket Lead Burial (3 Metre, 20mm External 14mm Internal) :](https://m.media-amazon.com/images/I/81TX0Lpdm1L._AC_SL1500_.jpg)