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Zinsco would remain with copper in both their panels and breakers until the third major copper shortage in the early 1960s, when they would switch to an aluminum bus. In 1963, Zinsco introduced the R-38 twin breaker, which was the only twin circuit breaker that also made contact on both bus-bars for 240 volts in a single breaker space.
They do not provide the level of circuit protection required by the NEC (National Electrical Code). Homeowners should be alerted to this safety defect and advised to have it corrected. FPE Stab-Lok circuit breaker panels should be replaced unless the occupants are informed and willing to live with the resulting increased risk of fire and injury.
Loose or poor connections in traditional electrical accessories and switchgear can cause heat to develop capable of starting a fire. This problem is known as High Resistance Connection (HRC) and safety devices such as fuses and Residual Current Devices (RCDs) are unable to disconnect the electrical supply because they cannot detect a HRC.
Magnesium oxide, more commonly called magnesia, is a mineral that when used as part of a cement mixture and cast into thin cement panels under proper curing procedures and practices can be used in residential and commercial building construction. Some versions are suitable for general building uses and for applications that require fire ...
I have posted a reference to a description of the problem; if you disagree, argue in here, don't just delete without explaining why you believe that what I have written was incorrect. And sign your name to it, or be damned as a coward. Shalom S. 02:56, 16 September 2010 (UTC)
The Zeppelin-Lindau D.I had stressed skin fuselage and wings.. In mechanical engineering, stressed skin is a rigid construction in which the skin or covering takes a portion of the structural load, intermediate between monocoque, in which the skin assumes all or most of the load, and a rigid frame, which has a non-loaded covering.
In 2007, PID was reported in a number of solar panels from Evergreen Solar (Photon 1/2008 and 8 /2008). In this case, the degradation mechanism occurring in photovoltaic modules containing the more common front junction (n+/p) crystalline silicon solar cells when the modules were in negative voltage potential with respect to ground.
Reema construction is a system of building using prefabricated reinforced concrete panels which came into being in the late 1940s and was still in use well into the 1960s. Buildings made in this way are currently (2008) very hard to obtain finance on in the UK, primarily due to potential problems with similar large panel system construction ...