Hi,
With reference to the post in "Changes for the 18th Edition", what is the reason for considering 1 Sec (see snap below) disconnection time for Other circutis in TN system.
As per BS 7671:2018 Regulation 411.3.2.3 - In a TN system, a disconnection time not exceeding 5 s is permitted for a distribution circuit and for a circuit not covered by Regulation 411.3.2.2.
So is this supposed to be 5 Sec as per the BS 7671?
Hi Shane,
My query is regarding the disconnection time fixed 1 Sec (as in snap below) for "Other circuits" in TN system. This value is same in a new project with default 18th edition also. Should the value be 5 Sec as per BS 7671:2018?
Hi Yadagani,
This may just be a display issue as I believe the software does take the figures you mention into account - please see the following excerpt from the manual:
I am consulting our development team to see if this is the case.
Shane Regan | Principle Building Performance Support Engineer