With some exceptions, an Employee is covered by the HCSO if the Employee works for an Employer covered by the HCSO and: 1  Is entitled to be paid the minimum wage; 2  Has been employed by the Employer for at least 90 calendar days; and. 3  Works at least 8 hours per week in San Francisco.
Vortex ring. Spark photography image of a vortex ring in flight. A vortex ring, also called a toroidal vortex, is a torus-shaped vortex in a fluid or gas; that is, a region where the fluid mostly spins around an imaginary axis line that forms a closed loop. The dominant flow in a vortex ring is said to be toroidal, more precisely poloidal.
However, and this is where many people get confused by this, a standard RCD does this by electronic determination of the load current via the detection circuitry unlike the MCB's and RCBO's. The torus forming the heart of the RCD has a small detection circuit attached to it via an op amp.or what it is worth, I have noticed lately that a number of manufacturers have started refering to Larger DC Sensing RCD's also as Main RCBO's, I suppose this is an attempt to clarify the whole situation and to ensure that Installers pick the correct protective device. securespark said: