So just now I was adding an extra light over my day bed it's a vintage 60 watt bulb looks like an old radio valve it even has the little glass pip on top. Anyhow as I was wiring it up two whiskas of wire touched there was barely any sound but it popped the 5 amp fuse in the plug adaptor and tripped 16 amp MCB how is this even possible even under partial short circuit conditions surely a 5 amp fuse should clear before a 16 amp MCB?
To go slightly off topic our local substation has a cable which runs most of the length of my street down to a link box then from the link box back up the street to feed the houses and a shop at the top of the road. When our nearest sub had a fault a short circuit in the LV that goes to the link box we were back fed from another substation the point I'm trying to make is just because your near the tranny don't assume you are on a short length of cable from it. My appoligies if I'm stating the obvious especially to our more seasoned members
The nearest tranny to us is about three doors down on the other side of the road. Ze is 0.21Ω which seems a bit high except that we are on a corner and the cable goes all the way past the house, round the corner, and back in.
Kelly does prompt an interesting question. Suppose that you normally have a low Ze and despite that one or more circuits have a marginal Zs. If the DNO alters it's configuration, ADS may not be quite as fast as it should be.
To go slightly off topic our local substation has a cable which runs most of the length of my street down to a link box then from the link box back up the street to feed the houses and a shop at the top of the road. When our nearest sub had a fault a short circuit in the LV that goes to the link box we were back fed from another substation the point I'm trying to make is just because your near the tranny don't assume you are on a short length of cable from it. My appoligies if I'm stating the obvious especially to our more seasoned members
The nearest tranny to us is about three doors down on the other side of the road. Ze is 0.21Ω which seems a bit high except that we are on a corner and the cable goes all the way past the house, round the corner, and back in.
Kelly does prompt an interesting question. Suppose that you normally have a low Ze and despite that one or more circuits have a marginal Zs. If the DNO alters it's configuration, ADS may not be quite as fast as it should be.
