can i use this connector for277v fluroscent ballast?

I don't see why not. As long as the wire fits into the opening, it should work fine...

Can these be used to connect different gauge wire? (e.g. 18 gauge to 16 gauge)

Yes. They can work with 14 to 22 gauge wires.

Do you need to strip the wire first?

No. It will cut through the outside casing. Works fine for my automower wire

Will this wire connector work for WR 165 landroid?

Yes. This will work with any electrical wire and is ideally used for on-ground or in-ground purposes to protect connections from the elements. Dog fencing, landroid bounding wire, etc.

Colour	20PCS
Connector Type	Idc
Contact Material	Gel
Insulation Material	Gel
Terminal	Pigtail
Material	Gel
Brand	GWHOLE
Specification Met	CSA, RoHS, UL
Product Dimensions	14L x 10W x 1.5H Centimeters
Maximum Voltage	600 Volts
Net Quantity	20.0 Count
Manufacturer	GWHOLE
UPC	706352777347
Country of Origin	USA
Item model number	Q163
ASIN	B07F9KH8PT

GWHOLE Pack of 20 Electrical IDC 314-BOX Wire Connectors for Robotic Lawn Mowers, Irrigation Applications…

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