Hi James, Max Ze for TNCS is 0.35…. What happens when you then have large protective devices for outgoing ways. For example perhaps the consumer unit is more than 3 meters away so you have to use a 100A bs88 fuse.. same for blocks of flats.. this has a max ZS of 0.34.. if the Ze is close to maximum, how on earth are you supposed to get round it ?
Hi, The figure of 1.2 is a multiplier to allow for the operating temperature, and we multiply this by the tabulated value for R1+R2. There is a worked example in one of my earlier videos. Please see the link ua-cam.com/video/-kLZt7oamNA/v-deo.html Regards James
Hi James,
Max Ze for TNCS is 0.35…. What happens when you then have large protective devices for outgoing ways. For example perhaps the consumer unit is more than 3 meters away so you have to use a 100A bs88 fuse.. same for blocks of flats.. this has a max ZS of 0.34.. if the Ze is close to maximum, how on earth are you supposed to get round it ?
Thanks
Hi,
You're welcome.
Regards
James
It didnt saeem to work out quite as expected should it not be (R1+R2/1000)/1.20 ? Some example measurements would be useful
Hi,
The figure of 1.2 is a multiplier to allow for the operating temperature, and we multiply this by the tabulated value for R1+R2. There is a worked example in one of my earlier videos. Please see the link ua-cam.com/video/-kLZt7oamNA/v-deo.html
Regards
James