A general contractor requires a subcontractor to name it as an additional insured on the subcontractor's liability policy. The practical effect is that the general contractor:

解析

An additional insured endorsement extends the named insured's liability coverage to another party, typically for liability arising out of the named insured's work or premises, so the general contractor gets a defence and indemnity under someone else's policy. It does not make that party a named insured, so no right to cancel, amend, or collect return premium comes with it. It also grants no first-party property coverage, because the endorsement operates only on the liability side.