Lập kế hoạch & Dự toánCâu 364 / 521
On an electrical floor plan, the switch symbol marked with a subscript 3 (S3) indicates what device?
a.A three-way switch
b.A single-pole switch
c.A switch rated 3 amperes
d.Three switches ganged together
Giải thích
The subscript on a switch symbol denotes the switch type: S3 is a three-way switch used to control a load from two locations. A plain S is single-pole, and the subscript is not an ampere rating or a device count.
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