Deba nv recommendations concerning the installation room The safety of the system is determined by more factors than the intrinsic safety of the construction in itself.

Therefore, Deba nv operates a number of installation directions in its technical documentation. These directions are subdivided in recommendations concerning:

• the floor spaceRead more.
  The surface on which the medium voltage switchgear is to be installed must be sufficiently strong and completely level. The maximum permissible difference in level is 2 mm/m.
• the surrounding conditionsRead more.
  The DF-2 cubicles have been designed for indoor installation in the following surrounding conditions:

  description	value
  Ambient temperature	min. -15 °C / max +45 °C
  Relative air humidity	min. 10 % / max. 70 % (without the formation of condensation)
  Installation altitude	max. 1000 m above sea level

  This means that one has to:

  • Avoid installation in dusty areas.
  • Avoid installation in areas with high relative air humidity.
  • Avoid installation in areas subject to lightning strikes.
  • Avoid installation in surroundings where the cells can come into contact with aggressive gases or fluids.

  Contact Deba nv when cubicles must be installed in areas where the surrounding conditions cannot be guaranteed.

• Ventilation Read more.
  • Ensure that there is good ventilation of the installation area.
  • Protect the ventilation openings so that small animals or vermin do not have access to the installation area.

  In particular, special attention should be given to the ventilation if the medium voltage switchgear contains one or more transformer.

  • Consult the following table when calculating the ventilation value.

  The table indicates the power losses of cast resin transformers.

  transformer capacity (in KVA)	P tot (W)
  100	1.605
  160	2.175
  250	2.850
  315	3.412
  400	4.012
  500	4.837
  630	5.745
  800	6.787
  1.000	7.875
  1.250	10.350
  1.600	12.450
  2.000	16.125

• the free height of the installation areaRead more.

  The free space above the construction must be at least 2,200 mm. Depending on the Utility, an even larger minimum space may be required. An ideal - and accepted by all Utilities - amount of free space is 2,500 mm.

  With cast resin transformers with a power of >= 1,250 KVA, the free height must be at least 2,500 mm.

• the sizes of the entrance doors in the installation area Read more.

  The dimensions given apply for all doors accessing the installation area. These minimum door sizes therefore also apply when the installation area is not directly accessible from the outside.

  omschrijving	waarde
  Height of the entrance door	min. 2.200 mm
  Width of the entrance door	min. 100 mm + width of the widest cell

  If the medium voltage switchgear does not contain transformer cubicle(s), a minimum door height of 2,000 mm will be sufficient.
  If a transformer is included, refer to the transformer dimensions. For the correct dimensions of the various cubicles, see "Dimensions and weights".
  
  If the medium voltage switchgear must be installed in basements or storage basements, an entrance hatch must be supplied which length as well as its width is at least 400 mm larger than the dimensions of the largest cubicle or the transformer.

• the free passage in front of the cellsRead more.

  The free passage in front of the cubicles depends on the composition of the medium-voltage switchgear.

  If the medium-voltage switchgear does not contain transformer housings, the minimum free passage is 1,500 mm. The preferable amount of free passage is 2,500 mm. In the case of medium-voltage switchgear with a transformer housing, with a power of >= 1.000 KVA the free passage has to be minimum of 2,000 mm.

• the arc-proofness Read more.

  To prevent major material damage and serious physical injury or electrocution in the (unlikely) event of an internal arc, the following installation instructions apply:

  • Leave at least 150 mm free between the rear wall of the cubicles and the wall of the installation. This way, the over-pressure valves of the back plate can operate in the (unlikely) event of an internal arc.

  A transformer housings can be positioned with its rear side against the wall.

  • Anchor each cubicle of the medium voltage switchgear using four bolts in the floor.
  • Connect the cubicles together using the attachment material supplied.
  • Ensure proper fitment of the end panels.

  In medium voltage switchgears installed in accordance with the above-described installation procedure, the (unlikely) event of internal arc will always be restricted to the compartment in which it occurred.