Question 1

Can this be installed at a breaker box on a 200amp main breaker?

Accepted Answer

Yes, sort of. You will need 2 meters with their respective current transformers (those black donuts). One donut for each of the main power wires coming from the meter. Since these donuts aren’t split, you will need to disconnect the cables while still live, unless you remove the power meter. Total power used is the sum of the meters. Basically, you will need an electrician. Or you could by the MTP 3100 or equivalent. It comes with 2 current transformers that are split, so that you open them, slide on the cable, and then close them around the cables. No cutting or disconnecting power. The current transformers are connected to a wireless transmitter that transmits to the base station which sums up the power consumed/cost per hour based on your kWh rate and weekly consumption graph from the 120V and 240V loads instantaneously. There is also a cable and software to connect to your PC.

Question 2

Power source? Does this run off the power of the circuit being tested or does it need a separate power source? Is it "self powered"?

Accepted Answer

It probably can but if you look at the images posted by the seller, it has a wiring diagram that says "Use isolated power source" for the meter's function.  Probably because the meter measures 0-90VDC but is only able to handle a 0-30VDC power source.  
  The last image has a very clear wiring diagram that's easy to red and understand from there on out though.  Good luck.

Question 3

I need this meter to measure ac volts and dc volts thanks

Accepted Answer

No - it only does AC volts and amps.  You likely need 2 individual meters.

Question 4

The paperwork doesn't show the cutout size. Does anyone know how big the hole needs to be?

Accepted Answer

Dear customer,
Cutout size is 68mmx37.5mm
Best regards,
DROK

ASIN	B01M8LCWNW
Best Sellers Rank	#241,355 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #3,604 in Voltage Testers
Brand Name	DROK
Colour	Black
Customer Reviews	4.4 4.4 out of 5 stars (577)
Item Dimensions	7 x 4 x 3 Centimeters
Item Weight	0.05 Kilograms
Manufacturer	DROK
Maximum Alternating Current	200 Amps
Maximum Operating Voltage	500 Volts
Measurement Type	Ammeter
Minimum Operating Voltage	500 Volts
Model Number	200069
Number of Items	1
Number of Packs	1
Part Number	200069
Power Source Type	Corded Electric
Specification Met	CE
Style Name	Digital

DROK 0.39 Inches LED 2in1 Multimeter AC 500V 200A Voltmeter Ammeter, AC Volts Meter Panel Ammeter Gauge with Current Transformer, 2-Wires Digital Ammeter Volts Meter Tester

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