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Wood will expand and contract across the grain, and a wide panel made of solid wood could change width by a half of an inch, warping the door frame. By allowing the wood panel to float, it can expand and contract without damaging the door. A typical panel would be cut to allow 1/4" (5 mm) between itself and the bottom of the groove in the frame.
As the worker approaches the line, an arc will form between the line and the worker as they are being charged. This arc can be debilitating, and the worker must immediately bond themself electrically to the line to prevent further arcing. [3] A worker may use a conducting wand during the approach to first make the connection.
The word "architrave" has come to be used to refer more generally to a style of mouldings (or other elements) framing a door, window or other rectangular opening, where the horizontal "head" casing extends across the tops of the vertical side casings where the elements join (forming a butt joint, as opposed to a miter joint). [3]
A vision panel is a small window in a door which allows people to look through without opening the door. Vision panels are sometimes in walls, generally adjacent to a door. These have implications in safety, primarily to avoid opening doors on a person coming the other way, but also in case of fire to avoid opening a door onto a fire.
An overhead line crossing is the crossing of an obstacle—such as a traffic route, a river, a valley or a strait—by an overhead power line.The style of crossing depends on the local conditions and regulations at the time the power line is constructed.
In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load from more than one location.A common application is in lighting, where it allows the control of lamps from multiple locations, for example in a hallway, stairwell, or large room.
This can present a danger in fire-prone areas where a conductor may snap and current may arc through trees or dry grass. Bare-wire or ground-return telecommunications can be compromised by the ground-return current if the grounding area is closer than 100 m or sinks more than 10 A of current. Modern radio, optic fibre channels, and cell phone ...
IEEE P1901-2020 "IEEE Standard for Broadband over Power Line Networks: Medium Access Control and Physical Layer Specifications" is a working group for delivering broadband over power lines. The aim is to define medium access control and physical layer specifications for all classes of BPL devices - from long distance connections to those within ...