[ Ammeters; Connections for electric lines; ] Contacts, electric; Converters, electric; Couplings, electric; [ Electrical adapters; Measuring apparatus, namely, clamp meters for measuring electricity; Resistance measuring instruments; ] Step-up transformers; [ Surveying machines and instruments; ] Switches, electric; Transformers; [ Voltmeters; Computer terminals; ] Electric control panels; [ Electrical ducts; ] Electrical plugs and sockets [ ; Telephone terminal ]