具体要看你是用UL的哪个标准。举个例来说,UL499里有这么个条款:
26.1.1.2 The spacings specified in Tables 26.1 and 26.2 do not apply to the inherent spacings of a
component part of a heater; such spacings are judged under the requirements for the component in
question.
如果你的发热器满足了spacing要求,描述具体的spacing可以考虑不需要报备制造商,如果不满足spacing要求,按26.1.1.2来满足的spacing要求,那就必须报备制造商。为了保证spacing,一般都是会报备制造商的。