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HC-12a, also called ES-12a, OZ-12a, DURACOOL 12a [1] and Hydrocarbon Blend B, is marketed as a "drop-in" replacement refrigerant for R-12 and other refrigerants. HC-12a is a mixture of hydrocarbons , specifically propane (R-290) and isobutane (R-600a), and is therefore considered nearly non-ozone-depleting.
1,1,1,2-Tetrafluoroethane (also known as norflurane (), R-134a, Klea 134a, Freon 134a, Forane 134a, Genetron 134a, Green Gas, Florasol 134a, Suva 134a, HFA-134a, or HFC-134a) is a hydrofluorocarbon (HFC) and haloalkane refrigerant with thermodynamic properties similar to R-12 (dichlorodifluoromethane) but with insignificant ozone depletion potential and a lower 100-year global warming ...
Various fractional sizes are also available; e.g., 2 ⁄ 3 A and 4 ⁄ 5 A. B: U10 336 (Russian Federation) #3 (China) R12 (carbon‑zinc) LR12 (alkaline) 8,350 (alkaline) 1.5: 21.5 × 60 Most commonly found within a European 4.5-volt lantern battery. Not to be confused with the vacuum tube B battery. C: U11 or HP11 (In the UK) MN1400 MX1400 Baby
The invention of a practical, efficient transformer made AC power distribution feasible; a system using distribution transformers was demonstrated as early as 1882. [2] If mounted on a utility pole, they are called pole-mount transformers. Suppose the distribution lines are located at ground level or underground.
An iron cored neon-sign transformer, with a 9-volt battery for scale. A neon-sign transformer (NST) is a transformer made for the purpose of powering a neon sign.They convert mains voltage in the range 120-347 V up to high voltages, in the range of 2 to 15 kV.
EIA/TIA-455-12A FOTP-12 Fluid Immersion Test for Fiber Optic Components; EIA/TIA-455-37A FOTP-37 Low or High Temperature Bend Test for Fiber Optic Cable; EIA/TIA-455-48B FOTP-48 Measurement of Optical Fiber Cladding Diameter Using Laser-Based Instruments; EIA/TIA-455-87B FOTP-87 Fiber Optic Cable Knot Test
The primary North American document that deals with outdoor high-voltage transformer fire barriers is NFPA 850. [1] NFPA 850 outlines that outdoor oil-insulated transformers should be separated from adjacent structures and from each other by firewalls, spatial separation, or other approved means for the purpose of limiting the damage and potential spread of fire from a transformer failure.
Choke transformers are sometimes called transmission-line transformers (although see below for a different transformer type with the same name), or Guanella transformers, or current baluns, or line isolators. Although called a "transmission line" transformer, it is distinct from the transformers made from segments of transmission line.