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?
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.
Indeed, and that is the reason for using the DNO’s maximum value for your design, rather than the figure you measured.
Point taken, but e.g. Table 41.3 gives maximum values for Zs, not R1 + R2; and an EICR looks at circuits as is, not who was responsible for their design.
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.
Indeed, and that is the reason for using the DNO’s maximum value for your design, rather than the figure you measured.
Point taken, but e.g. Table 41.3 gives maximum values for Zs, not R1 + R2; and an EICR looks at circuits as is, not who was responsible for their design.
