ABSTRACT
There may be a requirement to determine the voltage at the terminals of equipment to ensure that items of electrical equipment will function correctly and safely. BS 7671 is a little vague on exactly how this may be achieved, mentioning measuring circuit impedances or using calculations. The voltage drop is probably best established by measuring the voltage at the origin and at the end of a particular circuit, subtracting the two and ensuring the drop does not exceed the values indicated in Table 14.1 (it is not usually required to establish this during an initial verification); 3% for LV lighting circuits, 5% for LV power circuits, hence:
This page intentionally left blank
