DD IEC TS 62257-9-3-2007 pdf Recommendations for small renewable energy and hybrid systems for rural electrification- Part 9-3: Integrated system – User interface 

6.6 Protection against fraudulent use The interfaces shall be sealable by the local power distribution operator by means of approved seal fitting pliers. The seal shall prevent the user’s from accessing the power connection terminals and the protective conductor terminals. If necessary, on operator request, access will be prohibited to the front panels of the function blocks. The housing shall be designed such that the seals can be easily installed.
7 Information to be given and marking Information and marking shall be provided according to IEC 60439-3. The information may be given on a nameplate or by other means provided that it is legible and durable. The assembly shall carry at least the following information and marking: manufacturer’ s trademark, type reference, identification of neutral circuit (by N or light-blue color code), In stand-alone installations, for combined individual electrification systems producing both d.c. and a.c. power from a d.c. generator, the markings shall clearly identify the types of circuits with no possible ambiguity.
The following shall be identified: d.c. circuit and poles, a.c. circuit (Ph/N/ PE), earthing circuit. Where equipment has compliance marking or monograms indicating compliance with standards or with distinctive manufacturer s number serving as manufacturer’s trademark, these monogram/marking shall remain visible even after the conductors have been connected.
This procedure is intended to verify that the simplified user’s interface and the equipment connected to it comply with the applicable specifications. These requirements can be verified by examination of the markings or compliance certificate. The inspection procedure shall verifty, at least the following conditions to the extent that they apply: appropriateness of the protection against electrical shocks and overcurrents, identification of various circuits and conductors, identification of equipment and terminals, appropriateness of conductor cross sectional area and connections, accessibility for verification and maintenance, ccorrect operation of the contract management device. 8.3 Commissioning tests With the equipment powered up, these tests shall consist in verifying the compatibility of all the components of the simplified user’s interface and operation of all the devices, as well as the contract or energy manager operating points.