Current Transformers (CTs)

To determine the amount of Amperage Points/CTs needed in your assembly for ever meter point, it will vary on the voltage system.

• 120V_1ø2 wire voltage systems require 1 CT per meter point (1:1).
• 120/240V_1ø3 wire and 120/208V_2ø3 wire voltage systems require 2 CTs per meter point (1:2).
• 120/208V_3ø4 wire, 240/416V_3ø4 wire, 277/480V_3ø4 wire, 347/600V_3ø4 wire, 208V_3ø3 wire, 416V_3ø3 wire, 480V_3ø3wire and 600V_3ø3 wire voltage systems require 3 CTs per meter point (1:3).

Solid cores are provided with 6 ft. leads and the window size varies on the amperage:
	Inside Diameter	Outside Diameter	Thickness
100:0.1A - 0.5" window	0.5"  (12.7 mm)	1.1" x  1.1"  (27.94mm)	0.79"  (20.06mm)
200:0.1A - 0.75" window	0.75" (19.5mm)	1.9" (48.26mm)	0.68" (17.27mm)
400:0.1A - 1.68 window	1.68" (42.67mm)	2.78" (70.61mm)	0.8" (20.32mm)
600:0.1A - 3.75" window	3.5" (88.9mm)	4.7" 119.38mm)	0.86" (21.84mm)

Split cores are provided with a minimum of 2 ft. leads and the window size varies on the amperage:

• 100:0.1A - 0.75" window + 2 ft. leads
• 200:0.1A - 0.75" window + 2 ft. leads
• 400:0.1A - 1.25" window + 3 ft. leads