Guidance Note 3: Inspection & Testing (17th Edition, BS use EDIS in a way that enables compliance with Guidance Note 3. . EDIS Certificate PDF, includes the text from the Additional Comments field. EP4. Version 3, May 1. Electrical Safety Guidance Note 1 - General Guidance . 17th edition of the Institute of Electrical Engineers Regulations (IEE Regs) for. Size Report. DOWNLOAD PDF to the foregoing. Examples of such documentation are shown in the IEE Guidance Notes 3 on inspection and testing.
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items Ahead of the publication of BS , the Institution of Engineering and Technology (IET) and the British Standards Institution (BSI) have now. items The IET has launched a new version of the Wiring Regulations e-books. Wiring Regulations Digital: Online is a web-based e-book solution for. dealt with in Part 6 of the IEE Regulations, Chapters 61, Initial Verification, and Guidance Note 3 Section 2 and the IEE Regulations state the preferred testing.
Get up-to-speed with BS 18th Edition with this essential bundle! This book is vital for all involved in the electrical industry, including designers, installers, and those involved in testing and inspection of electrical installations. All new electrical installations will need to comply with BS from 1st January See a comprehensive list of the changes found in BS BS Corrigendum - December A corrigendum to BS has been issued highlighting eleven corrections.
Note the warnings given in Section 2.
Electric shock hazards can arise from, for example, capacitive loads such as cables charged in the process of an insulation test, or voltages on the earthed metalwork whilst conducting a loop test or RCD test. The test limits quoted in these guidelines are intended to minimise the chances of receiving an electric shock during tests. The inspector must also be fully versed in the inspection and testing procedures and employ suitable testing equipment during the inspection and testing process.
Likewise, following the periodic inspection and testing of an existing installation, a Periodic Inspection Report, together with a schedule of inspections and a schedule of test results, is required to be given to the person ordering the inspection. It is necessary for the user e.
It is recommended that those providing documentation to the person ordering the work recommend that the forms be passed to the user including any downloadr of a domestic property. The landlord should maintain the installation in a condition suitable for the use intended, and ensure that repairs are undertaken by a competent person. A tenant has a duty to ensure that those parts of the installation that are his or her responsibility are maintained in a safe condition, and to ensure that repairs are carried out only by a competent person.
Whilst there is no obligation to inspect and test any part of the existing installation that does not affect and is not affected by the alteration or addition, observed departures are required to be noted in the comments box of Electrical Installation Certificates single signature or multiple signature and Minor Works Certificates. This will enable deterioration to be identified. They can also be used as a management tool to ensure that maintenance checks are being carried out and to assess their effectiveness.
As far as reasonably practicable, an inspection shall be carried out to verify: i all fixed equipment and material is of the correct type and complies with applicable British Standards or acceptable equivalents ii all parts of the fixed installation are correctly selected and erected iii no part of the fixed installation is visibly damaged or otherwise defective.
Inspections Inspection is an important element of inspection and testing, and is described in Section 2. Tests The tests are described in Section 2. Results The results of inspection and tests are to be recorded as appropriate.
This can enable the condition of equipment and the effectiveness of maintenance to be monitored.
Relevant Criteria The relevant criteria are, for the most part, the requirements of the Regulations for the particular inspection or test. The criteria are given in Sections 2 and 3 of this Guidance Note. There will be some instances where the designer has specified requirements which are particular to the installation concerned. For example, the intended impedances may be different from those in BS In the absence of such data the inspector should apply the requirements set out in BS Verification The responsibility for comparing inspection and test results with relevant criteria, as required by Regulation , lies with the party responsible for inspecting and testing the installation.
The IEE Wiring Regulations BS defines different distribution systems as follows: IT: A systems having no direct connection between live parts and Earth, the exposed-conductive-parts of the electrical installation being earthed. This, in single-phase applications, means that the output of the isolating transformer is floating and no reference to earth exists. TN-S: A system having separate neutral and protective conductors throughout the system. TT: A system having one point of the source energy directly earthed, the exposed conductive-parts of the electrical installation being connected to earth electrodes electrically independent of the earth electrodes of the source.
TN-C: A system in which neutral and protective functions are combined in a single conductor throughout the system. In order to determine the classification of a medical location, it is necessary that the medical staff indicate which medical procedures will take place within the location. Based on the intended use, the appropriate classification for the location shall be determined. Note: Guidance on the allocation of a group number and classification of safety service for a medical location is shown in Section 3 Associated Information Part A The possibility that certain medical locations may be used for different purposes which necessitate a higher group allocation should be addressed by risk management.
As an example,load and earth fault currents associated with TN-C systems can circulate through the casing of Class I equipment thus causing electromagnetic interference with sensitive electronic medical equipment.. Protection by insulation of live parts and by barriers or enclosures is essential. However, as prescribed by IEC this limit is reduced to 25 V a. Normally protection by insulation of live parts and by barriers or enclosures applies only to SELV systems where the nominal voltage exceeds 25 V a.
What is implied here is that this type of protection is essential even when the nominal voltage does not exceed 25 V a. Theatre luminaries are normally supplied from the TN-S system via a safety isolating transformer. Note: In normal applications, the use of obstacles can be used as a measure for protection against direct contact with live parts where the application is limited to an area accessible only to skilled person, or to instructed person under the direct supervision of a skilled person.
Note: In normal applications, placing out of reach can be used as a measure for protection against direct contact with live parts where the application is limited to an area accessible only to skilled person, or to instructed person under the direct supervision of a skilled person.
Limits of conventional touch voltage in normal applications is 50 V.
Table 41 C as shown below defines the maximum disconnection time, under fault condition, on TN and IT systems for various nominal voltages. If such disconnecting time cannot be guaranteed, it is necessary to take other protection measures such as supplementary equipotential bonding.
Phase to phase voltage. Note: This implies that all socket-outlets in group 1 locations should be protected by RCDs. Note: The mechanism controlling its movement. Circuits for X-ray units. Circuits for large equipment with a rated power greater than 5 kVA. Circuits for non-critical electrical equipment non life-support. Note: Circuits used for connecting medical electrical equipment or medical systems for life-support and surgical applications in the patient environment should be supplied from the medical IT system.
On single first fault condition a low capacitive current a few mA will flow to earth which is insufficient to trip a 30 mA RCD. Under double fault conditions the RCD would not trip as no imbalance is detected. Care shall be taken to ensure that simultaneous use of many items of such equipment connected to the same circuit cannot cause unwanted tripping of the residual current protective device RCD. Note: The standard also recommends that TN-S systems are monitored to ensure the insulation level of all live conductors.
This recommendation ensures that any inadvertent short circuit between the earth and neutral conductor, thus creating a TN-C system, is identified.
This recommendation is not a mandatory requirement by the standard. The use of isolating transformers creates a safer environment to the patient and staff by minimising hazards from touch voltages and ensuring continuity of supply under single fault conditions. Isolating Transformers alone are not intended to protect against microshock and must be associated with circuit monitoring, supplementary equipotential earth bonding and an assessment of the treatment area.
The output of the isolating transformer is kept free from any earth connection. This concept affords better protection from potentially lethal shock hazards due to the absence of a low impedance earth return path. However, due to the capacitance of the line conductors to earth, there will always be a capacitive current flow to earth. The medical IT IPS system shall be equipped with an insulation monitoring device in accordance with IEC with the following additional requirements: The internal impedance shall be at least k.
The test voltage shall not be greater than 25 V d. The test current shall, even under fault conditions, not be greater than 1 mA peak.
Indication shall take place at the latest when the insulation resistance has decreased to 50 k. A test device shall be provided. These additional requirements are not at present covered by IEC They would be omitted once they are included in further editions of IEC IMDs are active devices monitoring continuously the insulation of the circuits connected to them; even if these circuits are not carrying any load current. In contrast to RCDs, being passive devices, their activation can only be achieved when the circuits are loaded.
A green signal lamp to indicate normal operation. A yellow signal lamp which lights when the minimum value set for the insulation resistance is reached.
It shall not be possible for this light to be cancelled or disconnected. An audible alarm which sounds when the minimum value set for the insulation resistance is reached.
This audible alarm may be silenced. The yellow signal shall go out on removal of the fault and when the normal condition is restored. Note: The type of equipment referred to here is normally connected permanently, i. An example of this is an X-ray unit or a laser. This should not be interpreted that one can terminate this final circuit with a single socket-outlet where loads connected to the latter are not pre-determined.
An indication of the limit being reached avoids excessive overloading. Although high temperature is normally associated with overload, it can also occur in non-ventilated enclosures. The rated voltage Un on the secondary side of transformers shall not exceed V a. The maximum limit of the output rated voltage allowed by the IEC for a medical IT transformer, either singlephase or 3-phase line to line applications, is limited to V a.
Note: It is essential that this requirement for leakage currents is specified as an additional requirement to IEC As it stands, IEC specifies these leakage currents to a limit of 3. This requirement enhances the safety applications of the transformer and brings it in line with IEC Screening against electrical interference fields, if installed. Connection to conductive floor grids, if installed. Metal screen of the isolating transformer, if any. Note: Fixed conductive non-electrical patient supports such as operating theatre tables and dental chairs should be connected to the equipotential bonding conductor unless they are intended to be isolated from earth.
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