The noun equipment does not have a plural form. It is used in the singular only, with a singular verb, and there is no word "equipments." Nouns like this are called "noncount nouns" (or "
Can I say equipment are?
Equipment is collective noun and as such can be used in plural. Although there are a lot of collective nouns that can be used with -s or without and they mean different things.
Is it or are for equipment?
Equipment is a noncount noun which means that it has no plural form. Even when it refers to more than one thing, it is still grammatically singular, so you should use a singular verb: Most of the equipment was defective.