In this talk we discuss many-body electric multipole insulators with dipole conserving symmetries. We present rank-2 response theories for a 2D quadrupole insulator and a 3D chiral hinge insulator. We demonstrate how many-body operators for determining electric multipoles can be used to make a criterion for distinguishing multipole metals from multipole insulators in systems with conserved multipole moments. If time permits we will also show that some classes of non-interacting Weyl semi-metals can exhibit a rank-2 vector charge response theory.