Surface wiring is wiring that is enclosed in some kind of containment and surface fixed. For example if you installed a conduit containment system to supply a socket this is screwed to the walls with "saddles" and a mounting block is used to protrude the socket off the wall to take the conduit. This is surface wiring as opposed to concealed wiring which is encased in the fabric of the wall and all you see is the socket.
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Testing and wiring should be carried out by a qualified , trained technician / engineer so that the electrical devices and wiring are properly done with safety.
Wiring a T101 timer is easy. All you have to do is color code the wiring into the input sections.
I thnk...it cn b ZHFR,FLR cables r suitble for explosion free wiring
According to www.wilberelectrical.com knob and tube wiring is no longer legal. You will need to replace it. Chances are, as knob and tube wiring is very, very old, something has broken or it has been disconnected as knob and tube is not very safe. I would recomment replacing it with modern wiring devices rather than trying to repair it.
No idea what a direct online motor is but it certainly sounds like a peice of electrical engineering - especially if there is a wiring diagram of it.