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2. Knob-and-tube wiring - Wikipedia

   en.wikipedia.org/wiki/Knob-and-tube_wiring

   Ceramic cleats, which were block-shaped pieces, served a purpose similar to that of the knobs except that cleats were generally used in places where the wiring was surface mounted. Not all knob and tube installations utilized cleats. Ceramic bushings protected each wire entering a metal device box, when such an enclosure was used.

3. Letter box - Wikipedia

   en.wikipedia.org/wiki/Letter_box

   An attached or wall-mount letterbox, with a hook underneath for newspapers. Wall-mounted or attached mailboxes may also be used in place of mail slots, usually located close to the front door of the residence. They are known as "full-service" mailboxes when they have provisions for securing outgoing as well as incoming mail.

4. Electrical wiring in North America - Wikipedia

   en.wikipedia.org/wiki/Electrical_wiring_in_North...

   The most common residential and small commercial service in Canada and the U.S., single split-phase, 240 V, features a neutral and two hot legs, 240 V to each other, and 120 V each to the neutral. The most common three-phase system will have three hot legs, 208 V to each other and 120 V each to the neutral.

5. Molly (fastener) - Wikipedia

   en.wikipedia.org/wiki/Molly_(fastener)

   For heavy objects, multiple molly bolts may be required. The name Molly was formerly trademarked [ 2 ] but is now often used in generic reference . Other names used for this same general type of fastener include hollow-wall anchor and hollow-door anchor , sometimes with design variations but always with the same design theme of expansion via ...

6. Aluminum building wiring - Wikipedia

   en.wikipedia.org/wiki/Aluminum_building_wiring

   Also, the size of the aluminum wire needs to be larger compared to copper wire used for the same circuit due to the increased resistance of the aluminum alloys. For example, a 15 A branch circuit supplying standard lighting fixtures can be installed with either #14 AWG copper building wire or #12 AWG aluminum building wire according to the NEC ...

7. Hold down (structural engineering) - Wikipedia

   en.wikipedia.org/wiki/Hold_down_(structural...

   At the bottom, the hold down is connected to the concrete foundation or structural slab by an embedded or epoxied anchor bolt. At the top, the hold down is connected to a wood post with screws, nails or bolts. Hold-down clamp for anchoring pipes