Enclosure supply inlets

There are many different combinations of supply inlets and exhaust enclosures, where the system has been designed as a whole. Two of these enclosures are described in some detail abrasive blasting rooms with a person working inside the enclosure, and hospital isolation rooms. 

Blowing hot air A typical arrangement is shown in Figure 31.9. The bus duct enclosure is provided with inlet and outlet valves at suitable locations. Hot air is supplied through the inlet valve until the interior of the enclosure is completely dry. The blowing equipment comprises an axial flow fan. a heater unit, an inlet air filter unit, pressure... 

Gas boosters may be fitted with motor enclosures or designed to operate at lower rotating speeds. Alternatively, they may be housed in an acoustic enclosure within the boiler house. The booster and drive unit can be supplied with anti-vibration mountings to isolate it from the floor or steelwork and flexible bellows fitted to the gas inlet and outlet connections. 

In that case braided wire can also be used. In the past, major power supply manufacturers had their own special custom-made metal brackets to connect the earth prong of the IEC inlet socket to the enclosure. But nowadays, standard IEC 320 inlets with built-in metal brackets are directly available, such as that from Methode Electronics Inc. at www.methode.com. 

We ask — is it really a good idea to place a small inductor (e.g. a bead or small toroid with a few turns) somewhere in the earth connection Suppose we place it on the wire connecting the ac inlet to the enclosure (or PCB to inlet). This is then called a ground choke or earth choke. It is commonly found on low-power evaluation boards (from vendors promoting their clever IC solutions), but rarely seen on a commercial power supply. 

The section below the stack (and the fans) was used to host the electronic control boards, the DC-DC converters, and the H2 supply structure. Small fans were used to keep the control boards from overheating, and the hotter air was sent out of the system from the openings on the enclosure, as shown in Figure 5.7. The H2 supply structure included a pressure sensor, an inlet solenoid valve, an outlet solenoid valve, and metal piping. Table 5.3 shows the key parameters of the system. 

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