0.0084 inch or 0.21 mm dia

0.0092 inch or 0.23 mm dia

0.0100 inch or 0.25 mm dia

0.0076 inch or 0.19 mm dia

should be tight in the notch

should be loose in the notch

should be neither loose nor tight

may be either loose or tight

440 V / 11000 V

650 V / 1100 V

1100 V / 11000 V

11000 V / 132000 V

Paper insulated lead covered

Paper insulated lead core

Polythene insulated lead core

Polyvinyl insulated lead core

more flexible

more area of cross section

more resistance

more weight