October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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Water heaters 105
When a cylinder or tank is drilled to accommodate an immersion heater, it
is important to ensure that no metal particles are left inside; otherwise
chemical action may occur, leading to leaks, particularly when dissimilar
metals (such as copper and galvanised steel) are involved.
Electrical connections for water heating appliances
As stated earlier, it is not good practice to connect water heaters of more than
say 1.5 kW loading on socket-outlet ring or radial circuits and they should
preferably be on separate circuits from the consumer unit; this applies
whether they are on the normal or off-peak supply.
In bathrooms, ever ...
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