Access electrical panels

Water, gas, electrical and drain lines are contained in chases which run vertically between floors on either side of the hall. Outside each laboratory there is a locked access panel in the chase, the key to which is kept in the laboratory. In an emergency any utilities to a single laboratory may be shut off from this chase. Of course, the building is equipped with the usual array of smoke and heat detectors and fire alarms. 

The containment vessel is mounted over the axles of the trailer with the door facing the front of the trailer. The water and reagent tanks are at the front of the trailer. The area between these components serves for preparing and loading the mnnition. All controls and instramentation displays are readily accessible from this working area. The electrical supply panels and the hydraulic pump are mounted at the rear of the trailer. Piping and electrical conduit run under the main deck. 

Each circuit should be clearly identified and labeled to correspond to a circuit breaker in a service panel. Access to these service panels should be provided to most laboratory employees, but they should not be permitted to remove the protective panel covers protecting the wiring. No closet containing an electrical service panel should be allowed to be used for a storage closet by laboratory personnel. Access to the panel should not be blocked by extraneous items, and accidental contact with the wires should not be possible, especially for an untrained person entering the space. 

Recommendation 6. A redesign of the layout is required to ensure appropriate access to the electrical service panel. If possible, it should be located adjacent to the operator console area to enable the operator to easily access the electrical circuits in the event of an emergency. If total relocation of the service panel from one side of the room to another is not possible or feasible because of building limitations, room design, or other factors, then the operator s console should be provided with a deadman switch that will deenergize all electrical power to the vapor degreasing system, including the crane. This relatively simple solution will provide the operator more control over the risk associated with critical electrical systems and subsystems. 

Stand alone fire or gas detection and alarm panels are normally provided in the main control facility for the installation. Recent trends also incorporate the transmittal of fire and gas alarms through the DCS into the main process alarm real time control panel. When alarm panels are located within a protected building, they should be located for easy access for emergency response personnel and proximity to manual electrical power shut off facilities. 

Maintenance to most occupants of the buildings involves work either in their immediate area or directly affecting their area. An exception is the electrical panel which controls the breakers to electrical circuits within a laboratory. As noted earlier, there are reasons why employees other than maintenance personnel will need (sometimes urgently) to deactivate electrical circuits, and if proper isolation of the panels is done to prevent access to active electrical wiring, the breaker panel closets can be made safely accessible. 

Prevent access to energy. An example is a key control on electrical panels. 

PLC Networks can be used by electric distributors to offer internet access as add value. The analyzed noise can affect the throughput in the distribution and it is necessary to install filters not only at the power source per PLC connection but also the filter must be installed at the main electrical panel. The general scheme can be seen in Figure 17. 

In addition to overcurrent devices, certain switching devices can reduce or eliminate electrical hazards. These include interlocks, lockouts, and thermal or overspeed switches. Interlocks are switches that prevent access to an energized or dangerous location. Often attached to access doors, panels, and gates, interlocks act to shut off power to the equipment whenever these devices are opened. Probably the most commonly used and most familiar interlock... 

How do you quickly power down a piece of equipment Where is the location of the emergency gas shut-off Do you know the location of the electrical panel for the laboratory in the event that you wish to disable electrical power to the lab Can you easily access the electrical panel or is it blocked by something ... 

There are a large number of machinery safety applications in which there is no justification, in terms of risk reduction, for having a dual channel singlefault tolerant single-fault detection architecture such as this. For example, an interlocked access door on an electrical panel in which the components are all protected to IP2X standard and which is only accessed once a week would only warrant a single channel category 1 interlock. 

Access to these electrical panels must never be blocked with equipment or stored materials that can prevent immediate and rapid access to the panel. In an emergency an item of equipment blocking the panel could result in a serious problem if quick access is necessary. Also, do not remove the panel cover or door these must be left in place to prevent inadvertent actuation of circuit breakers and to prevent device damage or personal injury. 

Figure 76 Cutaway of a generic commercial aero engine. (A) Electric control unit casing, (B) Acoustic lining panels, (C) Fan blades, (D) Nose cone, (E) Nose cowl, (F) Engine access doors, (G) Thrust reverser buckets, (H) Compressor fairing, (J) Bypass duct, (K) Guide vanes, (L) Fan containment ring, (M) Nacelle cowling.

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