Demonstration Downloads

Demonstrations of FormFill and CableCalc are available from this site:


Free Program Downloads

CableCalc icon

CableCalc Level P will calculate radial and ring circuits wired in twin & earth cable. We're even including free technical support by email.

FormFill icon

FormFill Level P is a fully working, unlimited use version that includes Domestic Minor Works and Domestic Electrical Installation Certificates (up to 12 ways) which print to plain paper or PDF file.

Manual Downloads

Get Adobe Acrobat ReaderThe latest versions of our manuals for our software are now available on-line from this site. You will need Adobe Acrobat reader, available free of charge to view them.

If you wish to view the manuals on-line then simply click on one and it will be opened in Adobe Acrobat Reader, however if you have a slower connection (56.6K or less) then it is recommended that you download these files and view them from your computer. This can be done by right clicking on the file, and selecting Save Target As.

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PDF Document


7101 Kb


PDF Document


7337 Kb


Web Updates

Program Updates

Here at Castline Systems, we do not believe in charging the full price of a program if a lower major version is already owned. We offer special rates applying to those wishing to purchase an upgrade, these rates can be obtained by phone - (01293) 871751, or by E-Mail -