IEC-60617 Symbol Preview - One-Line Bus-tap

Horizontal Symbol	Vertical Symbol	Description
HDV1_BT_1-	VDV1_BT_1-	Bus-tap - main/dot
HDV1_BTT_1-	VDV1_BTT_1-	Bus-tap - dual/tee
HDV1_BTL_1-	VDV1_BTL_1-	Bus-tap - dual/corner