§253 電気トレースヒーティングシステム

Notes: - This section only applies to electrical trace heating systems which are placed on the market pursuant to Directive 2014/34/EU by a manufacturer as electrical equipment. - It is not intended to deal with electrical trace heating installations which are designed, installed and approved in accordance with particular national regulations in the Member States.

Conformity assessment of different types of electrical trace heating systems (1) Electrical trace heating systems designed for use in potentially explosive atmospheres are electrical equipment pursuant to Directive 2014/34/EU. In many cases certain characteristics, relevant for safe operation, in particular the temperature class, are determined by the design and the installation. Therefore the process of placing on the market has to take on board these special conditions. Consequently it is necessary to apply certain special requirements regarding installation of these products. It is particularly important to specify the responsible person /the manufacturer, the supplier (designer) or the installer) who ensures that the electrical heating system complies with the requirements of Directive 2014/34/EU and therefore takes over the responsibility of a manufacturer. These questions cannot be answered clearly and comprehensively for all electrical trace heating systems, as a differentiation needs to be made between specific designs and techniques.

(2) The measures required for the explosion protection of electrical trace heating systems depend on the category (respective zone classification), the explosion group, and the temperature class involved. Directive 2014/34/EU does not require category 3 systems to be certified by a notified body. The manufacturer is required to apply the modules as described in Annex VIII (Internal control of production) for conformity assessment. The manufacturer compiles an EU declaration of conformity and the technical documentation that enables assessment of conformity with the requirements of the Directive. Hence, the product shall not have the number of a notified body affixed, unless individual testing pursuant to Annex IX is involved. Existing industry standards do not address the installation of electrical trace heating systems in zone 0 (category 1), so this will not be examined any further. The following statements apply exclusively to category 2 electrical trace heating systems.

(3) It should be noted in particular that the existence of EU-type examination certificates which only apply to individual system components of a trace heating system is inadequate. As temperatures may vary, depending on the type of the heating cables and installation conditions involved, each system needs to be examined individually. The applicable EU conformity assessment procedure should be employed to suit the design. Therefore, the manufacturer of the trace heating system is required to apply one of the possible conformity assessment procedures pursuant to Directive 2014/34/EU for electrical equipment. As regards category 2 these are the following modules:

- Annex III and VI, or - Annex III and VII, or - Annex IX.

(4) Different types of trace heating systems:

a) Trace heating systems with a temperature class depending on the construction of the trace heater: In the case of electrical trace heating systems with a temperature class depending on the construction of the trace heater (hereinafter referred to as type A), the temperature class is defined by the construction of the heating cable. Typically, a type A trace heating system is understood to be a trace heating system with a self-limiting characteristic. Therefore a trace heating system type A is an equipment according to Directive 2014/34/EU, even if the installation has not yet taken place. The manufacturer needs an EU Type Examination Certificate issued by a Notified Body. The manufacturer of trace heating system type A is responsible for placing the product on the market together with an appropriate EU Declaration of Conformity, CE marking and instructions for use. Instructions for use shall serve as the information for appropriate commissioning, assembling and installation of the system in accordance with the manufacturer’s specifications. The specific temperature class is indicated on the marking of the trace heating system The employer is responsible to install the trace heating system in accordance with Directive 1999/92/EC. The manufacturer's instructions for use must be taken into account during installation. In addition, also the requirements with respect to the skills of personnel during installation must be considered during installation. If a trace heating system type A is to be operated with a more restrictive temperature class than the temperature class that results from the construction of the heating cable, see b).

b) Trace heating systems with a temperature class depending on the configuration:

In the case of electrical trace heating systems with a temperature class depending on the configuration (described below as type B), important parameters relevant to explosion protection - in particular the temperature class - are mainly determined by the individual design, configuration of the heating circuit and the installation method. In general, type B trace heating systems include fixed resistance heating cables. Because of specific characteristics of trace heating systems type B, the placing on the market occurs only after the installation, as the temperature class only can be verified at that time by a final commissioning test. It means that the manufacturer affixes CE marking, the name plate including temperature class and issues the EU declaration of conformity only during or after installation. The manufacturer is responsible for the installation of the trace heating system. However, the manufacturer can subcontract partial steps of the manufacturing process, in particular installation to a third party if there are corresponding contractual agreements with the manufacturer. The manufacturer obliges the subcontractor with these contractual agreements to respect the requirements of the manufacturer’s EU type examination certificate (e.g., for qualification of personnel). The manufacturer is responsible for all issued documents. Engineering or installation companies act as a manufacturer, if they design trace heating systems Type B out of different components and install them on site. The reason why they are regarded as manufacturer is, that they place type B electrical trace heating systems on the market under their name or trademark. Therefore, such a company must get their own certificates of conformity and fulfil all obligations of the manufacturer, including EU Declaration of Conformity, the CE marking and instructions for use.

Note: The aforesaid does not replace inspections prior to putting into service required by Member State legislation in the field of Directive 1999/92/EC.

Annex 1

Example of a trace heating system:

For design, installation and maintenance, the application guide EN 60079-30-2 may be used, this guide is written in conjunction with the product standard EN 60079-30- 1, according to which trace heating systems for use in potentially explosive atmospheres are usually assessed and certified.

Annex 2

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