Because of theinfluence of wind in creating current, there is a relationshipbetween this oceanic circulation and the general circulationof the atmosphere. The oceanic circulation is shown on thechart following this page (winter N. hemisphere), with thenames of the major ocean currents.
Radiological Dispersion Device. Terrorist use of a Radiological Dispersion Device (RDD) â often called âdirty nukeâ or âdirty bombâ â is considered far more likely than use of a nuclear explosive device. An RDD combines a conventional explosive device â such as a bomb â with radioactive material.
RCDs 1 1. What is an RCD and what does it do? An RCD is defined, in BS 7671, as: âA mechanical switching device orassociation of devices intended to causethe opening of the contacts when theresidual current attains a given valueunder specified conditionsâ.. Types of RCDs. RCD is the generic term for a device. that operates when the residual. current in the circuit reaches a. predetermined value. The list above indicates the different. types of RCD available, a description of. each device and examples of how the. device is used.