IEC 62395 1 Edition 2 0 2013 09 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical resistance trace heating systems for industrial and commercial applications – Part 1 General and testing requirem[.]
General
Electrical resistance trace heating systems must be designed and built to guarantee electrical, thermal, and mechanical durability, ensuring reliable performance Under normal usage conditions, these systems should not pose any risk to users or their environment.
Trace heaters designated for low-risk mechanical damage areas undergo modified impact tests as outlined in sections 5.2.4 and 5.2.5, as well as a reduced force in the deformation test specified in section 5.2.6 Additionally, these heaters must be distinctly labeled in accordance with Clause 7.
Trace heaters and surface heaters may be supplied with additional mechanical protection to meet the requirements of this standard if they are supplied as an integral assembly
(prefabricated), and shall be marked as required by Clause 7, item g)
Trace heating equipment intended for use in contact with potable water shall be constructed of materials that meet relevant toxicity requirements
The manufacturer must specify the maximum withstand temperature in degrees Celsius Additionally, the materials utilized in the trace heater or surface heater should endure temperatures that are 20 K higher than the declared maximum withstand temperature, as tested according to section 5.2.11.
Electrically conductive covering
Trace and surface heaters must feature a uniformly distributed electrically conductive covering that covers at least 70% of the surface area Additionally, surface heating units should be designed so that the electrically conductive covering is positioned opposite the surface intended for heating.
Electrical circuit protection requirements for branch circuits
Trace heating systems must meet essential requirements, including the ability to isolate all line conductors from the power supply, over-current protection for each branch circuit, and Earth-fault protection for every branch circuit.
Trace heater or surface heater branch circuit electrical protection must effectively interrupt both earth faults and short-circuit faults It is essential to utilize an earth-fault protective device or a controller equipped with earth-fault interruption capability, with a recommended nominal trip rating of 30 mA However, in situations where capacitive leakage could cause nuisance tripping, devices with a trip current not exceeding 300 mA may be appropriate These protective devices should be used alongside circuit overcurrent protection In cases where maintenance and supervision guarantee that only qualified personnel will service the systems, and continuous circuit operation is critical for safe equipment or process functioning, earth-fault detection without interruption is permissible, provided that an alarm system ensures an acknowledged response.
Temperature requirements
A trace heating system must be designed to ensure that the surface temperature of the trace or surface heater remains below its maximum withstand temperature and any specified system temperature ratings under all foreseeable conditions This can be accomplished through a stabilized or controlled design approach.
In stabilized design applications, the maximum surface temperature of trace or surface heaters, which operate without thermostatic control, must adhere to either the systems approach outlined in section 5.2.13.2 or the product approach detailed in section 5.2.13.3.
The surface temperature obtained through controlled design is based on energy limitation by temperature controllers or limiting devices
Type tests – General
All trace heaters and surface heaters shall meet the requirements of the type tests given in
5.2 Trace heaters and surface heaters intended for applications described in Clause 1, items b), c) and d) shall also meet the requirements of 5.3, 5.4 and 5.5, respectively
Samples of trace heaters selected for testing shall be at least 3 m in length, unless otherwise specified
Integral components must undergo the same type testing as the trace or surface heater, unless specified otherwise Other system components, not classified as integral, should be assessed based on the applicable standards related to their design and functionality.
Tests shall be conducted at a room temperature between 10 ºC and 40 ºC unless otherwise specified
Separate samples shall be used for each test unless otherwise specified These shall be prepared in accordance with the manufacturer's recommendations.
Type tests – All applications
The dielectric test shall be performed on trace heaters or surface heaters in accordance with
Table 1 – Test voltages for the dielectric test
For single conductor series trace heaters or surface heaters the voltage shall be applied between the conductor and the metallic sheath, braid, screen or equivalent electrically conductive covering
For multi-conductor series trace heaters or surface heaters, voltage must be applied between the connected conductors and the metallic sheath, braid, screen, or equivalent conductive covering, as well as between each conductor individually with the other conductors connected together.
For parallel trace heaters or surface heaters the voltage shall be applied between the conductors connected together and the metallic sheath, braid, screen or equivalent electrically conductive covering
The dielectric test can also be performed by immersing trace or surface heaters in tap water at room temperature, which typically has a resistivity of 50,000 Ω·cm During the test, a voltage is applied between the heating conductors and the water.
The rate of rise shall be neither less than 100 V/s nor more than 200 V/s and maintained for
1 min at the specified test voltage without dielectric breakdown The test voltage waveform shall be essentially sinusoidal, with a frequency of 45 Hz to 65 Hz
For type tests 5.2.4 to 5.7.1 concerning MI trace heaters, the required test voltage specified in section 5.2.1 is adjusted to 2U + 500 V a.c for MI trace heaters with a rating of 30 V a.c or higher, and to √2U + 500 V d.c for those rated at 60 V d.c or higher.
When determining U, the correct use of phase-to-phase or phase-to-neutral voltage levels shall be considered
The electrical insulation resistance shall be measured on the test sample(s) prepared in accordance with 5.1 after the dielectric test specified in 5.2.1
For single conductor series trace heaters or surface heaters, it is essential to measure the resistance of the electrical insulation between the conductor and the metallic sheath, braid, screen, or any equivalent electrically conductive covering.
For multi-conductor series trace heaters or surface heaters with electrically insulated conductors, it is essential to measure the resistance of the electrical insulation This measurement should be taken between the connected conductors and the metallic sheath, braid, screen, or equivalent conductive covering, as well as between each individual conductor and the remaining connected conductors.
For parallel trace heaters or surface heaters, it is essential to measure the resistance of the electrical insulation between the connected conductors and the metallic sheath, braid, screen, or any equivalent electrically conductive covering.
The insulation resistance shall be measured by means of a d.c voltage of at least 500 V The measured value shall be not less than 50 MΩ
Flammability tests are required for trace heaters and surface heaters, including those with integral components, ensuring compliance across all sizes These tests must be conducted in a draught-free environment within a flame chamber or fume hood of at least 0.5 cubic meters For trace heaters, samples should measure a minimum of 450 mm in length and be positioned vertically, while surface heater samples must adhere to the same length requirement with a maximum width of 80 mm.
Wrap a gummed unbleached paper indicator around the sample, ensuring it extends 20 mm beyond the sample's edge Position the paper indicator 250 mm above where the inner blue cone of the flame touches the sample Additionally, place a layer of dry, pure surgical cotton, no deeper than 6 mm, beneath the sample, maintaining a distance of 250 mm from the cotton to the flame application point.
For the test, a laboratory burner compliant with ASTM D 5025-05 must be utilized The gas flame generated by this burner should be calibrated according to ASTM D 5207-09 Suitable fuels for this calibration include methane, propane, or natural gas, ensuring they meet the required grade.
The ASTM D 5207-09 procedure requires the flame to be adjusted to a height of 130 mm with a 40 mm inner blue cone The burner must be tilted at a 20° angle from the vertical, directing the flame to the heating device so that the tip of the inner blue cone touches the specimen 250 mm below the unbleached paper indicator and approximately 150 mm from the bottom of the sample For termination assemblies, the flame should contact the material at its most vulnerable point, while clamps supporting the sample must be positioned above the paper indicator and at least 80 mm below the flame application point.
The flame must be positioned so that the vertical plane of the burner tube's major axis is perpendicular to the sample For surface heaters, the flame is directed at the horizontal midpoint, with the unbleached paper indicator placed vertically above the flame, following the dimensions illustrated in Figure 1.
The flame shall be applied for 15 s and then removed for 15 s, until five such applications have been made
The test results are deemed satisfactory if the sample does not sustain combustion for over 1 minute after the fifth flame application, does not burn more than 25% of the extended unbleached paper indicator, and does not ignite cotton from falling burning particles.
Figure 1a – Height of natural gas flames Figure 1b – Vertical plane at right angles to sample under test Key
2 Support 5 Dry pure surgical cotton
Figure 1 – Flammability test Room temperature impact test
Electric trace heaters and surface heaters are typically protected by thermal insulation, providing mechanical safety in most applications However, there are instances where this protection is absent, such as during installation prior to insulation application or when the heaters extend from insulation into junction boxes or exposed outdoor areas.
A sample approximately 200 mm in length is placed on a rigid flat steel plate (approximately
The sample, weighing 21 kg and measuring 195 mm × 195 mm × 70 mm, is placed on a rigid substrate that minimally absorbs impact energy Positioned beneath a hardened steel cylinder, which has a diameter of 25 mm and a length of 25 mm, the sample is supported by this intermediate piece featuring smoothly rounded edges with a radius of approximately 25 mm.
To test surface heaters, a cylinder with a diameter of 5 mm is laid horizontally on the sample, with the axis of a trace heater positioned across the sample For trace heaters with a non-circular cross-section, they must be aligned so that the impact is applied along the minor axis, ensuring the sample is flat against the steel plate.
Type tests – Additional tests for outdoor exposed surface heating
The rated output of the trace heater or surface heater shall be verified by the procedure described in 5.2.10.3.3
Determination of maximum sheath temperature
The maximum sheath temperatures of the trace heater or surface heater shall be verified by the procedure described in 5.2.13.2.4
A sample of trace heater or a representative surface heater, measuring at least 3 meters, along with all integral connections and end terminations, must be submerged in water at a temperature range of 10 ºC to 25 ºC for a duration of 2,000 hours (12 weeks).
After conditioning, the sample will undergo a dielectric test (5.2.1) and must endure this test for 1 minute without experiencing dielectric breakdown Subsequently, the same sample will be evaluated using the electrical insulation resistance test (5.2.2), with the measured resistance required to be no less than 50 MΩ.
A sample of trace heater approximately 300 mm long, or a representative sample of a surface heater, shall be exposed to a source of a xenon arc light as described in Procedure B of
The samples undergo 20 days of exposure to xenon arc radiation, with a cycle consisting of 20 hours of light followed by 4 hours of darkness After this exposure period, the samples are removed from the testing apparatus and evaluated using the cold bend test as outlined in section 5.2.7.
Trace heaters or surface heaters having a continuous metal sheath with no outer jacket shall be exempt from this test
A trace heater or surface heater sample, measuring at least 200 mm in length, must undergo testing This sample should be positioned on a sturdy, flat steel support, utilizing a metal cutting edge for the procedure.
A 0.25 mm radius cutting edge must be positioned perpendicular to the sample An ohmmeter should be connected to the shorted conductors of the trace heater or surface heater, as well as to the metal cutting edge.
A proof load of 445 N will be gradually applied to the cutting edge as it contacts the sample An ohmmeter will be utilized to ensure that the cutting edge does not penetrate the insulation and make contact with the conductors of the trace heater or surface heater.
Six 1-meter samples of trace heater will undergo testing to measure the electrical resistance of their metallic sheath, braid, screen, or equivalent conductive covering This measurement will be conducted using an ohmmeter with an accuracy of ± 1%.
The average initial resistance shall be calculated
The samples will be positioned in the abrasion test apparatus depicted in Figure 12 One end of each sample will be secured to a horizontal reciprocating table, while the opposite end will be connected to a 340 g mass Each sample will rest on a 90 mm radius cylinder located at the table's end and will be covered with a fresh layer of grade material.
1/2 (medium) emery cloth, or 120 grit silicon carbide/resin bond abrasive paper The longitudinal axis of the cylinder shall be horizontal and perpendicular to each of the samples
The table shall commence reciprocating at a rate of approximately 30 cycles per minute Each cycle shall consist of one complete back-and-forth motion with a stroke of approximately
The testing procedure involves stopping the table every 50 cycles to reposition or replace the abrasive material, ensuring that all samples are subjected to a fresh surface during subsequent cycles After completing 2,500 cycles, the resistance of the conductive braid or sheath of each sample is measured again The average resistance is then calculated and compared to the initial average value, with the final average resistance not exceeding 125% of the initial average Additionally, if the samples are overjacketed, it is crucial that the underlying conductive braid or sheath remains unexposed.
Reciprocating table with 160 mm stroke
Quarter cylinder with radius of 90 mm
Figure 12 – Abrasion test Tension test
A 30 kg mass, or a mass sufficient to impose the manufacturer's stated maximum tensile value, whichever is greater, shall be suspended from the free end of the heating section of a
A 1-meter long sample will be tested for 1 hour, ensuring that one end is securely fastened Throughout the test, it is crucial that there is no breakage of the conductors or braid, and the insulation must show no visible damage.
(except in the areas where the sample was secured)
Rail system voltage spike test
Rail heating systems often experience voltage spikes from the power supply For outdoor metal structures, such as rail de-icing applications, trace heaters or surface heaters must undergo testing A sample of at least 2 meters of trace heater or a representative surface heater should endure 1,000 cycles of 5,000 V impulses, with each impulse having a rise time of 1.2 microseconds and a fall time of 50 microseconds After this testing, the sample must meet the criteria outlined in sections 5.2.1 and 5.2.2.
Rail system over-voltage test
Some rail heating systems can experience increased voltage conditions for extended periods
For outdoor metal structures requiring de-icing, a trace heater sample of at least 2 meters or a representative surface heater must be chosen This sample should be installed on a suitable mounting surface, including expansion loops and necessary accessories, following the manufacturer's installation guidelines Additionally, the ambient air temperature must be kept at the maximum specified for the system.
A voltage of 1,25 times the nominal operating voltage shall be applied for one hour The sample shall then pass the requirements of 5.2.1 and 5.2.2.
Type tests – Additional tests and test modifications for embedded heating
The rated output of the trace heater or surface heater shall be verified by the procedure described in 5.2.10.3.4
Determination of maximum sheath temperature
The maximum sheath temperatures of the trace heater or surface heater shall be verified by the procedure described in 5.2.13.2.5
The heater’s resistance to cutting shall be verified by the test described in 5.3.5
Trace heaters and surface heaters designed for embedded applications, like snow melting in concrete slabs, may be exempt from the flammability test outlined in section 5.2.3.
Type tests – Additional tests for applications of trace heating internal to
Type tests – Additional requirements for sprinkler systems
Normal and abnormal operation test
These tests are only applicable to trace heating systems intended for use on sprinkler systems
The trace heater and its components must comply with all relevant type tests outlined in section 5.2 Furthermore, they are required to successfully undergo both normal and abnormal operation tests to confirm their effectiveness Temperature control, as specified in section 4.4.1, is also a necessary inclusion.
Trace heating equipment must be installed on piping systems according to the manufacturer's guidelines It is essential to monitor temperatures to ensure that, when properly installed on a sprinkler system branch line and supply pipe configuration, the trace heater or surface heater maintains pipe surface temperatures between 4 °C and 38 °C.
The trace heater or surface heater shall be installed onto the piping arrangements shown in
Figures 13 (or Figure 14) and Figure 15 Figure 14 shows an alternative arrangement to
The test rig can be modified from the original design of 3 m of pipe with a 90 mm outside diameter and two sprigs to a more efficient setup featuring 2 m of pipe with the same diameter and a single sprig For tests conducted at the minimum ambient temperature, the sprig should be oriented vertically down, while for the subsequent test, it should be positioned vertically up This adjustment adheres to Schedule 40 specifications.
Steel piping or equivalent materials must be utilized for constructing piping arrangements If the manufacturer specifies the use of trace heaters or surface heaters with non-metallic piping, such as plastic, testing should follow the piping arrangement outlined in Figure 13.
Trace heating systems for sprinkler system mains and supply lines, as shown in Figure 15, will be tested with each piping material It is important to note that these systems do not apply to branch lines that contain sprinkler heads.
The installation of the trace heating system, along with thermal insulation, must adhere to the manufacturer's guidelines, ensuring that the trace heating is positioned at the nearest allowable distance to the sprinklers as illustrated in Figure 13 (or Figure 14).
Thermocouples shall be installed to measure the pipe surface temperatures at locations as shown in Figures 13 (or Figure 14) and Figure 15
Each arrangement must be installed in a conditioning test chamber, with sprinkler outlets oriented vertically The test conditions require maintaining thermal equilibrium, indicated by constant temperature readings, achieved when three successive readings taken at intervals of 10% of the elapsed test duration show no further increase, with a minimum interval of 15 minutes The test chamber temperature should be set to the minimum ambient temperature specified in the manufacturer’s installation instructions, not exceeding minus 20 °C, with the sample exposed to air movement of no more than 2 m/s, or at an ambient temperature of 35 ± 2 °C under the same air movement conditions.
2 On 32 mm outside diameter sprig pipe adjacent to sprinkler head
3 On 90 mm outside diameter branch pipe approx 0,3 m from sprig
4 On 90 mm outside diameter branch pipe approx 0,9 m from sprig
Figure 13 – Sprinkler system temperature control test – branch line arrangement
2 On 32 mm outside diameter sprig pipe adjacent to sprinkler head
3 On 90 mm outside diameter branch pipe approx 0,3 m from sprig
4 On 90 mm outside diameter branch pipe approx 0,9 m from sprig
Figure 14 – Sprinkler system temperature control test – branch line – alternative arrangement
1 On 110 mm outside diameter pipe approximately 1 m from valve flange
2 On 110 mm outside diameter pipe approximately 0,5 m from valve flange
3 On body of OS&Y (outside screw and yoke) valve, away from heater sample
Figure 15 – Sprinkler system temperature control test – supply pipe arrangement
When installed as intended on a sprinkler system branch line as specified below, with the primary temperature controls disabled, pipe surface temperatures shall not exceed 55 °C, or
8 °C less than the minimum temperature rating of the sprinklers intended to be used with the system, whichever is less
NOTE This can be achieved by the use of a separate high-temperature limit controller to de-energize the trace heater with automatic reset and annunciation
The trace heating system including insulation shall be installed onto the sprinkler branch line as specified in Figure 13 (or Figure 14 with ‘sprig up’) For spiral wrapped trace heaters use
120 % of the trace heater length specified by the manufacturer for those spiralled sections
Thermocouples shall be installed to measure the pipe surface temperatures as specified in
In the test setup depicted in Figure 13 (or Figure 14), the primary temperature control is turned off, and the trace heating system operates at 110% of its rated voltage The arrangement is placed in a conditioning chamber, ensuring that the sprinkler outlets are positioned in a vertical plane The test sample will be subjected to an ambient temperature of 35 ± 2 °C, with air movement limited to a maximum of 2 m/s.
Routine tests
The primary electrical insulation jacket of trace or surface heaters must endure a dry-spark test with a minimum voltage of 6,000 V a.c This test should utilize a sinusoidal waveform operating between 2,500 Hz and 3,500 Hz Specifically, for a 3,000 Hz supply, the product's speed in meters per second must not exceed 3.3 times the electrode length in centimeters, with this requirement being proportional to the frequency.
As an alternative to the dry-spark test, the dielectric tests in 5.2.1 shall be conducted (except that the test voltage is to be maintained for 1 s instead of 1 min)
After applying a metallic covering, braid, or equivalent conductive material, the heating device must undergo a dielectric test as specified in section 5.2.1, with the test voltage maintained for 1 second instead of 1 minute Additionally, non-metallic overjackets are required to pass a dry-spark test at a minimum voltage of 3,000 V a.c Alternatively, the dielectric tests outlined in section 5.2.1 can be performed, again with the test voltage held for 1 second.
The power output rating for each length of parallel trace heater must be verified for linearity through continuous or statistical testing methods For series resistance trace heaters or fixed resistive heaters, the power output rating is confirmed by measuring d.c resistance, conductance, or current at a specified temperature Testing criteria should align with the output verification tests outlined in section 5.2.10, ensuring that the measured power output remains within the manufacturer's declared tolerances.
General
All the markings specified in IEC 60519-1 that are applicable to trace heating are included in the following requirements.
Product markings
Trace heaters, surface heaters and field-assembled components shall be clearly and permanently surface-marked in accordance with Table 2 or shall have a durable tag/label
For trace heaters or surface heaters that have factory-fabricated terminations, as well as components with limited surface areas where clear printing is not feasible, the required markings must be placed on a durable tag or label This tag should be permanently affixed within 75 mm of the power connection fitting or gland, or the smallest unit container, rather than directly on the component itself.
ASSEMBLED COMPONENTS (except integral components) (1)
Manufacturer, trademark, or other recognized symbol of identification YES YES
Manufacturers' catalogue numbers, reference numbers, or models ensure that suitable applications—such as outdoor locations, wet environments, sprinkler systems, and internal tracing in potable water—are easily traceable to the corresponding product installation instructions and data sheets.
Month and year of manufacture, date coding, applicable serial number, or equivalent YES YES
The rated power output per unit length or surface area is defined at the specified rated voltage and a reference temperature, particularly for devices whose output varies with temperature This includes the resistance in ohms per unit length for series trace heaters, as well as the operating current or total wattage as relevant.
Trace heating equipment qualified for outdoor locations , wet locations, potable water and sprinkler systems is permitted to be so marked on the trace heating equipment YES YES
Applicable environmental requirements, such as IP (ingress protection) ratings, and area use requirements YES
(1) Other markings may apply for non-integral components
The manufacturer must supply specific installation instructions for trace heaters and surface heaters, including their components When termination and installation instructions are the same, guidance for different components and heaters may be consolidated.
Instructions must clearly specify applicable products and locations, including: a) intended uses as per Clause 1; b) a statement “Suitable for use with” followed by relevant trace or surface heaters; c) a requirement for earth-fault equipment protection for each circuit; d) a warning to “De-energize all power circuits before installation or servicing”; e) a reminder to keep ends of trace or surface heaters dry during installation; f) a caution for trace heaters in low mechanical damage areas; g) a directive that mechanical protection must remain in place for trace or surface heaters; h) a requirement to connect the metal sheath or equivalent to an earth terminal; i) a notice for pipe or vessel applications to post caution signs at appropriate intervals; j) a similar notice for outdoor de-icing applications; k) a statement that installation personnel must be suitably trained and supervised; l) a requirement for sprinkler systems to connect alarm outputs to fire detection systems; m) compliance with local codes and standards for sprinkler system installations.
Thermal insulation over trace heating must not obstruct the sprinkler or cover the wrench boss, as outlined in NFPA 13 Instructions for upright sprinklers should include specific information from IEC 62395-2:2013, particularly items e), f), and g), along with a reference to Figure 7 It is essential that sprinkler systems with trace heating are properly grounded Additionally, trace heating systems for fire sprinkler systems must be permanently connected to the power supply, and their design and monitoring should comply with IEC 62395-1.
The IEC 62395-2 standard specifies that if backup power is supplied for building electrical systems, it must also extend to the trace heating system Additionally, the intended applications for sprinkler systems should be clearly stated, such as whether they are for supply piping only or for both supply piping and branch lines, including sprinkler heads Furthermore, it is essential to indicate the minimum ambient temperature rating for these systems.
[1] IEC 60050 (all parts), International Electrotechnical Vocabulary (available at
[2] IEC/IEEE 60079-30-1 3 , Electrical apparatus for explosive atmospheres – Electrical resistance trace heating – Part 1: General and testing requirements
[3] NFPA 13, Standard for the installation of Sprinkler systems
Exigences de protection électrique applicables aux circuits terminaux 58
Essais de type – Toutes les applications 59
5.2.2 Essai de la résistance d'isolement électrique 60
5.2.4 Essai de tenue aux chocs à température ambiante 62
5.2.5 Essai de tenue aux chocs à température minimale 63
5.2.9 Essai de résistance à l'eau des composants intégrés 66
5.2.10 Vérification de la puissance assignée 67
5.2.11 Stabilité thermique des matériaux d'isolation électrique 70
5.2.12 Essai des performances thermiques des rộsistances de traỗage en parallèle 70 5.2.13 Détermination de la température de gaine maximale 72
5.2.14 Vérification du courant de démarrage 79
5.2.15 Vérification de la résistance électrique du revêtement électriquement conducteur 80 5.2.16 Essai de décharge de traction des connexions (terminaisons) 80
Essais de type – Essais complémentaires pour les installations de chauffage
5.3 en surface exposées à l'extérieur sans isolation thermique 80
5.3.1 Vérification de la puissance assignée 80
5.3.2 Détermination de la température de gaine maximale 80
5.3.3 Essai de résistance à l'humidité accrue 80
5.3.5 Essai de résistance à la coupe 81
5.3.8 Essai des pics de tension d'un système ferroviaire 82
5.3.9 Essai de surtension d'un système ferroviaire 82
Essais de type – Essais complémentaires et essais modifiés pour les
5.4.1 Vérification de la puissance assignée 83
5.4.2 Détermination de la température de gaine maximale 83
5.4.3 Essai de résistance à la coupe 83
Essais de type – Essais complémentaires pour les applications de systèmes
5.5 de traỗage à l’intộrieur des conduits et des tuyaux 83
5.5.1 Vérification de la puissance assignée 83
5.5.2 Détermination de la température de gaine maximale 83
5.5.3 Essai de résistance à l'humidité accrue 83
5.5.4 Essai de force de traction 84
Essais de type – Exigences supplémentaires pour les installations
5.6.1 Essai en fonctionnement normal et anormal 84
5.7.2 Vérification de la puissance assignée 87
Figure 2 – Essai de tenue aux chocs à température ambiante 62
Figure 3 – Exemple d’appareil d’essai de tenue aux chocs à température ambiante 63
Figure 4 – Exemple d’appareil d’essai de tenue aux chocs à température minimale 64
Figure 5 – Essai de pliage à froid 66
Figure 6 – Essai de résistance à l'humidité 67
Figure 7 – Vérification de la puissance assignée 69
Figure 10 – Plaque de fixation, le contact entre les rộsistances de traỗage ộtant autorisé 76
Figure 11 – Température de gaine maximale déterminée à l'aide de la théorie des produits 79
Figure 13 – Essai de contrôle de la température d'une installation d'arrosage – montage de dérivation 85
Figure 14 – Essai de contrôle de la température d'une installation d'arrosage – autre montage de dérivation 86
Figure 15 – Essai de contrôle de la température d'une installation d'arrosage – montage d'alimentation 86
Tableau 1 – Tensions d'essai pour l'essai diélectrique 59
SYSTÈMES DE TRAÇAGE PAR RÉSISTANCE ÉLECTRIQUE
POUR APPLICATIONS INDUSTRIELLES ET COMMERCIALES –
Partie 1: Exigences générales et d'essai
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La Norme internationale CEI 62395-1 a été établie par le comité d'études 27 de la CEI:
Chauffage électrique industriel et traitement électromagnétique
Cette deuxième édition annule et remplace l'édition précédente publiée en 2006 et constitue une révision technique
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
– Ajout d'essais pour le traỗage sur les installations d'arrosage;
– Modification de l'essai d'inflammabilité en vue d'une adaptation à la dernière version de la future norme CEI/IEEE 60079-30-1 1 ;
– Ajout d'un essai supplémentaire permettant de vérifier la température de gaine à l'aide d'un systốme de traỗage montộ sur une plaque de fixation
Le texte de cette norme est issu des documents suivants:
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant abouti à l'approbation de cette norme
Cette publication a été rédigée selon les Directives ISO/CEI, Partie 2
A comprehensive list of all parts of the IEC 62395 series, published under the general title "Electrical Resistance Tracing Systems for Industrial and Commercial Applications," is available for consultation on the IEC website.