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The phrase "are required when the" is correct and usable in written English.
It can be used in contexts where specific conditions or criteria must be met for something to be necessary or mandatory.
Example: "Documents are required when the application is submitted to ensure all information is complete."
Alternatives: "must be provided when the" or "are necessary when the".
Exact(27)
In addition, more attractive support schemes are required when the technological level is improved.
The sciences call for induction from experience, though deductive processes are required when the laws of science are formalized into mathematical terms.
With water as dispersion medium, lower temperatures are required when the solvent property of water towards the PVME stabilizer becomes good enough to effect steric stabilization.
HTS cable terminations are required when the insulated shield HTS cables connect with other conductors such as a bus or a overhead lines.
Decisions are required when the automated system sensors detect that a safety condition has developed that would be hazardous to the equipment or humans in the vicinity of the equipment.
Matrix elements of physical operators are required when the accurate theoretical determination of atomic energy levels, orbitals and radiative transition data need to be obtained for open-shell atoms and ions.
Similar(33)
That is, a bond is required when the will does not waive the requirement for the named executor.
A small height is required when the cross section area is constant.
Currently, health agencies recommend that no sun-protection is required when the UV Index UVIis is less than 3.
Surgical treatment is required when the fracture is unstable, and/or when there is significant fragment displacement.
And reversal will be required when the tainted evidence is introduced in intentional violation of constitutional standards.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com