Will this work on 4/0 wire?

Yes I personally used it on 750MCM which is 5 times the diameter of 4/0. This is a great phase rotation meter.

Does it work on 480-V delta and wye systems?

Yes. It has worked perfectly on all systems and all voltages up to and including 480 for us. Excellent tool and much safer.

Will this work on the output of a VFD?

It should as long as the VFD is running (being commanded to go a direction at 50-60 HZ)

Can this be used on single phase 240 volt service?

Hi, phase sequence is only used to determine the correct phasing of the 3 phase supply. You need not use this device for single phase at all. You only need a volt meter to ensure that the supply is in order in terms of L N E.

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Extech 480400 Phase Sequence Tester

Product ID: 84072298

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Details

Brand
Extech
Power Source
Battery
Style
Durable
Item Weight
0.14 Kilograms
Item dimensions L x W x H
6.9 x 3.2 x 13

⚡Tests up to 690 VAC

📊Graphical multiline LCD display

🔄Detects phase orientation & sequence

Description

⚡ Stay ahead of the current with precision phase testing!

NO BATTERY HASSLE - Operates without batteries, so you’re always ready to test without downtime or extra costs.
POWERFUL VOLTAGE RANGE - Accurately tests phase sequence from 40 to 690 VAC, covering industrial and commercial needs.
INTUITIVE GRAPHICAL DISPLAY - Large multiline LCD visually shows phase orientation and live status for quick, confident diagnostics.
ROBUST USER FRIENDLY DESIGN - Durable double-molded housing with wide-jaw alligator clips ensures secure connections and long-lasting use.
PRECISION FREQUENCY COMPATIBILITY - Supports 15 to 400 Hz frequency range, perfect for diverse three-phase power systems.

The Extech 480400 Phase Sequence Tester is a compact, battery-free tool designed for professionals to accurately test and visualize phase orientation and sequence in three-phase power systems up to 690 VAC. Featuring a clear graphical LCD and rugged build, it ensures reliable, fast diagnostics across a wide frequency range, making it an essential device for electricians and engineers aiming for flawless power system management.

Specifications

Brand	Extech
Power Source	Battery Powered
Style	Durable
Item Weight	0.14 Kilograms
Item dimensions L x W x H	6.9 x 3.2 x 13 Centimeters
Specification Met	CE
Measurement Type	Phase Sequence Indicator
UPC	798256210433 793950484005
Manufacturer	Extech
Global Trade Identification Number	00793950484005
Country of Origin	USA
Model number	480400
Number of Memory Sticks	1
Item Weight	140 g
Product Dimensions	6.86 x 3.18 x 12.96 cm; 140 g
Batteries	1 Product Specific batteries required.
Item model number	480400
Item Height	12.96 Centimeters
Item Width	3.18 Centimeters
Are batteries included?	No

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