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  2. Attic ladder - Wikipedia

    en.wikipedia.org/wiki/Attic_ladder

    Attic ladders are usually made of wood, metal, aluminum, or fiberglass. Also, fire departments carry attic ladders on fire apparatus for use to locate and extinguish fires in attic spaces. They are in a single ladder that is often used by firefighters for interior attic access and have hinged rungs, which allow them to be folded inward so that ...

  3. Fixed ladder - Wikipedia

    en.wikipedia.org/wiki/Fixed_ladder

    Fall protection system: Fixed ladders above 24' must have a fall protection system in accordance with OSHA Standard 1910.28(b)(9)(i)(C). Cages are not anymore considered as fall protection, and ladders that are newly installed or replaced after November 19, 2018, must have a fall protection system based on OSHA's new fixed ladder requirements.

  4. List of New York City Subway R-type contracts - Wikipedia

    en.wikipedia.org/wiki/List_of_New_York_City...

    New car design – auxiliary systems R110A: Prototype new technology passenger cars 8001–8010 Kawasaki 1992 Retired, 6 in work service, 4 pending work service R110B: Prototype new technology passenger cars 3001–3009 Bombardier Transportation 1992 Retired, 3001/3004–3006/3008 used for training R111 Funding/purchasing 2 cranes R112

  5. Decisional balance sheet - Wikipedia

    en.wikipedia.org/wiki/Decisional_balance_sheet

    John C. Norcross is among the psychologists who have simplified the balance sheet to four cells: the pros and cons of changing, for self and for others. [19] Similarly, a number of psychologists have simplified the balance sheet to a four-cell format consisting of the pros and cons of the current behaviour and of a changed behaviour. [20]

  6. R-value (insulation) - Wikipedia

    en.wikipedia.org/wiki/R-value_(insulation)

    Installed faced fiberglass batt insulation with its R-value visible (R-21) [1]. The R-value is a measure of how well a two-dimensional barrier, such as a layer of insulation, a window or a complete wall or ceiling, resists the conductive [2] flow of heat, in the context of construction. [3]

  7. Knob-and-tube wiring - Wikipedia

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

    Modern home buyers often find that existing K&T systems lack the capacity for today's levels of power use. First-generation wiring systems became susceptible to abuse by homeowners who would replace blown fuses with fuses rated for higher current. This overfusing of the circuits subjects wiring to higher levels of current and risks heat damage ...

  8. English football league system - Wikipedia

    en.wikipedia.org/wiki/English_football_league_system

    The system consists of a pyramid of leagues, bound together by the principle of promotion and relegation. A certain number of the most successful clubs in each league can rise to a higher league, whilst those that finish the season at the bottom of their league can be sent down a level.

  9. List of R-phrases - Wikipedia

    en.wikipedia.org/wiki/List_of_R-phrases

    R19 May form explosive peroxides R20 Harmful by inhalation R21 Harmful in contact with skin R22 Harmful if swallowed R23 Toxic by inhalation R24 Toxic in contact with skin R25 Toxic if swallowed R26 Very toxic by inhalation R27 Very toxic in contact with skin R28 Very toxic if swallowed R29 Contact with water liberates toxic gas. R30