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要走管
Concrete floors
Conduits that need to be located within the concrete slab generally use 25 mm conduit for power, phone, data and TV.
The mains cable duct from the meter box is typically 50 mm diameter with a swept bend to allow for the main earth to be installed into it as well. (Note that, if the underground mains cable is long, it may be a multi-core aluminium conductor requiring a 100 mm duct and swept bend).
Locate telephone or cable connection conduits a minimum of 300 mm away from the power duct – generally use 25–32 mm conduit. |
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