Medical Facilities Application catalogue

Introduction of covered fields Medical Facilities Hospital building and grounds - Challenges presented to an electrical installation in a hospital Hospitals building are wide and diverse. They start outside the perimeter fence, or sometimes even a kilometer away. 3-wire measurements of the earthing system use a lot of space, and the larger the system, the further away one needs to stake the measurement electrode. In densely populated areas, this might not be possible, and alternative methods must be employed. The 2-clamp method is simple and reliable – but one has be aware of its weaknesses and...

Contents Medical Facilities Hospital wards and patient recovery areas - These spaces are filled with medical appliances and often Biomedical Appliances also drugs, other liquids and at times food. Patients can interact with all of them, making spillages and mechanical damage common. Corrosion is a serious hazard as it can cause voltage drops on bad connections or between metal parts without additional equipotential bonding. Examples include accessible conductive parts on medical equipment, appliances or beds and protective earth. Usually there is a lot of them to check, which makes simple automated...

Electrical Safety and Quality Bundle Case Solutions@Metrel® INNOVATIVE APPROACH Application bundles are combinations of tools in a set for each application, location or measurement regimen. They can be customised to match your needs or preselected by Metrel. Licenses for the instrument, PC and Android software, customisation and appropriate accessories are included. Each solution also includes literature and posters, both printed and electronic, as well as training for the users to maximise the benefit to them. While the standard sets cover the anticipated installations, special locations and...

By your responsibility Selection guide Each facility has its own work organization, but it is common to find two profiles that deal with electrical safety and functionality: an electrical engineer that has a lot of installations and equipment to care for, and an occupational safety professional that may be the first person to respond to a problem. Metrel has prepared a choice of instruments that either give very accurate results, or are particularly easy to use and can be handled by electrical laypersons. Choose the instruments depending on your responsibility and level of electrical knowledge....

Hospital earthing and lightning protection Solutions by the Field of Use Medical Facilities

Many hospital complexes grow organically, essentially not planned for their final size when the building began. Constructing, maintaining and testing the resulting earthing system can be a serious challenge. Hospitals and other large building complexes (e.g. large shopping malls or factories) can become a major part of common power earthing system in the area. They can have an internal substation with earthing for the whole complex constructed with a particularly low impedance (TN part of the system), and its underground distribution has to be taken into account for the wider surroundings. Each...

2-clamps method for measuring lightning and earth protection Hospital earthing and lightning protection Particularly in urban areas, the classic earthing measurement with rod electrodes isn't possible. There is neither space to place them at sufficient distance from the object to be tested, nor is there access to the actual soil to drive in the rod. One has to make do with what there is. One of the options is the measurement with two clamps. It is useful for distributed earthing system with a lot of electrodes or for lightning conductors, and quicker and easier to perform than the rod measurements....

only be noticed if there are previous measurements which show a trend. The whole resistance of the system is still low enough, and one failed connection somewhere might not make a difference. 1 10 = 10 Ω + Ω = 10 Ω + Ω = 11.67 Ω 6 6 10 Equation 1: Example of calculation for 6 earthing electrodes with 10Ω resistance each. Rm is the measured leg. Measuring and Regulation Equipment Manufacturer The method lacks a way of proving the result similar to changing the positioning of electrodes in the 3-wire method. The results have to be taken in good faith. It is very important to check for any other...

Hospital earthing measurement with fall of potential method Hospital earthing and lightning protection Measuring earthing resistance can be both difficult and tedious. It requires special equipment and multiple repetition of measurements, particularly on large systems with multiple earthing points. The fall-of-potential method also called the 3-wire or 3-spike method, is a common way of measurement and the first recommendation by standard IEEE 80. It is particularly useful for earths in remote locations. The three spikes are the earth electrode under test and two extra, often labelled P (for...

The electrodes can also be placed as vertices of the equidistant triangle. Measurement result at any electrode positioning should be checked by repetition at different distances. S electrode is moved about 10% closer to, then further from the E in regard to original position. Standard IEC 60364-6 advises moving it by 6m each time. The reading shouldnآt change more than 10%. Otherwise, the probes should be moved further away from the electrode under test. If there is a suspected object underground, moving the spikes to a different position would help. It is good practice to repeat the measurement...

Mains bonding and touch voltages during fault current Hospital earthing and lightning protection Equipotential bonding is a system that lowers potential differences in an installation by bonding the conductive parts together and to protective earth. It is possibly the most important safety measure in an installation. The earthing system is meant to shorten the duration of the hazardous voltages, while equipotential bonding lowers the voltage differential between points of contact during a fault. Any conductive surface or item should be considered for bonding, regardless of its relationship with...