Abstract
IEC 60670-24:2024 applies to enclosures and parts of them for housing protective devices and other power dissipating electrical equipment intended to be used with a rated voltage not exceeding 400 V and a total incoming load current not exceeding 125 A for household and similar fixed electrical installations. These enclosures are intended to be installed in locations where unskilled persons have access. They are intended to be equipped with electrical equipment by skilled persons (installers). These enclosures are intended to be installed where the prospective short circuit current does not exceed 10 kA unless they are protected by current limiting protective devices with a cut-off current not exceeding 17 kA. Enclosures complying with this document are suitable for use at ambient temperature not normally exceeding 40 °C, but their average temperature over a period of 24 h does not exceed 35 °C, with a lower limit of the ambient air temperature of −5 °C. This third edition cancels and replaces the second edition published in 2011. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) revision of requirements for protection against electric shock in Clause 10;
b) addition of requirements for functional earthing in 11.101;
c) revision of the requirements for fixing of flush type and semi-flush type enclosures in 12.12;
d) revision of the requirements for resistance of insulating material to abnormal heat and to fire in Clause 18;
e) addition of calculations to take into account the power loss of electronic devices in Clause AA.6;
f) addition of tests and requirements for enclosures exposed to direct sunlight with the related Annex CC;
g) addition of tests and requirements for enclosures with separate area to accommodate multimedia-equipment with the related Annex DD;
h) addition of tests and requirements for enclosures used with connected devices or equipment with the related Annex EE.
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