Each span type will have a span definition. The span definition is a workbook associated with the span type containing all the dropper characteristics information.

Each span will have a corresponding worksheet inside the span definition workbook in the following format.

Length_Low. The Length_Low parameter is the lowest length of the span in metres where the dropper information listed should be used.

Length_High. The Length_High is the highest length of the span in metres where the dropper information listed should be used.

DefaultStartSystemHeight. The DefaultStartSystemHeight is the system height at the start of the span stated on the drawing for the given span type.

DefaultEndSystemHeight. The DefaultEndSystemHeight is the system height at the End of the span stated on the drawing for the given span type.

For symmetrical span types, the DefaultStartSystemHeight and DefaultEndSystemHeight should be the same.

MaxSystemHeightChange. This value should be marked as 0, as this is not currently used in Lineardraft.

Index. The Index column lists the total amount of droppers in the span, this includes a suppressed dropper at the end to represent the connection to the next wirepoint.

Length. This column lists the vertical length of each dropper.

Spacing. This column lists the horizontal length between each dropper.

Note: The sum of the spacing column must be equal to the Length_Low value.

AdjustSpacing. The AdjustSpacing column lists which dropper Spacings can be adjusted from the value at the minimum span length (Length_Low).

In the example image above, all the AdjustSpacing cells are listed as TRUE, therefore, all dropper spacings will be adjusted equally for span lengths above the Length_Low.

SuppressDropper. This column lists whether each dropper is to be displayed in Lineardraft.

Typically, the only dropper with SuppressDropper as TRUE is the final dropper.

Worksheet Name. The worksheet name should always be in the following format: 'Length_Low'-'Length_High'.