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How does a KT or KH Busbar Trunking System (BTS) react to condensation?

There is a risk of condensation when air around KT /KH conductors is cooling.

For example, for humidity = 50% and ambient temperature at 50°C around working conductors. When the power disappears, the ambient temperature will be <37°C, and the humidity in the air starts to condense. This is called : dew point.

From 37°C to 4°C (ambient temperature), the condensation will increase:

- During this time:
  • with KH range: water can be evacuated through the holes in the casing
  • with KT range: water stagnates inside the casing at critical parts (jointing bloc, outlet...)
- After the re-starting of the busway: We'll have serious electrical risks with the KT range.

In conclusion :

- when KT or KH are running without any turn off, there is a thermal balance, therefore no condensation means no risk.
- If busway must be turned off for long time, it's necessary to have a security process before re-starting :
check for the prescence of humidity, if yes, carry out  preventive drying and check the insulating resistances (IEC 60439-1 & 8.3.4)
for further assistance regarding insulating test , starting after water damage please contact the Canalis technical team on  0870 608 8 608
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