Abstract: An inverter arm is made up of two transistors electrically connected in series, each transistor having its own independent control unit. The control units are supplied by a common power supply unit ensuring galvanic insulation by means of a transformer with two distinct secondary windings. This galvanic insulation allows a potential difference of several hundred volts between the transistors and their control circuit.

Abstract: A high-safety container more particularly intended for dangerous products or installations. A tank includes an inner sidewall, a floor and a top which define a storage enclosure. A continuous leak-proof foundation basement includes a downwardly bulging cupola having a convex undersurface exposed throughout to external upwardly directed hydrostatic-like thrust. The tank floor is disposed above and laterally spaced from the upper concave face of the downwardly bulging cupola to define a lower ventilating gap therebetween. The pillars extend between the tank floor and the upper concave face to support the tank over the cupola. An outer wall integral with the cupola forms an upwardly projecting peripheral extension of the cupola. An annular space is defined between the outer wall and the inner side wall around the tank. A filler material disposed in the annular space contributes to the stability of the container with respect to lifting effects caused by hydrostatic thrust, even when the container is empty.