Can a 3m 314-box idc connector be used to splice 2 speaker wires together. i need to extend my speakers wires so i can move my amp. thanks...

Yes you can use them connecting speaker wires.

Will this work for 18 gauge underground dog fence? Also rewiring a horse trailer?

it will work for that gauge size. The things you will want to avoid is any frequent change of tension on the wire, and of course having it protected. It's moisture resistant, not waterproof.

UL listed and approved?

The Part Number 3M314 Scotchlok is UL LIsted

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3M Scotchlok Electrical IDC (Insulation Displacement Connector) 314-BOX, Pigtail, Self-Stripping, Moisture-Resistant, Blue, 22-14 AWG (solid/stranded), Pack of 50

3M Scotchlok Electrical IDC (Insulation Displacement Connector) 314-BOX, Pigtail, Self-Stripping, Moisture-Resistant, Blue, 22-14 AWG (solid/stranded), Pack of 50

Product ID: 18778940

Details

Color
Blue
Connector Type
Idc
Contact Material
Brass
Insulation Material
Nylon
Terminal
Idc

⚡600V/1000V voltage rating

💧Moisture-resistant seal with grease

🔥Flame retardant nylon insulation

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€ 76.04

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Description

⚡ Connect with confidence — the pro’s choice for flawless, moisture-proof wiring!

PRO LEVEL DURABILITY - Flame retardant nylon insulation ensures safety and longevity in demanding environments.
POWER READY PERFORMANCE - Rated for up to 1000 volts, perfect for industrial and signage applications.
MOISTURE LOCK TECHNOLOGY - Mineral oil-based grease seals out moisture and corrosion for reliable connections.
QUICK CLEAN INSTALLATION - Self-stripping design and easy crimping tools make professional repairs a breeze.
VERSATILE WIRE COMPATIBILITY - Fits 22-14 AWG solid or stranded copper wires, covering a broad range of wiring needs.

The 3M Scotchlok 314 IDC Connector is a flame retardant, nylon-insulated wire connector designed for quick, reliable connections of 2 or 3 wires (22-14 AWG). Featuring a moisture-resistant seal with mineral oil grease, it supports up to 600V for building wire and 1000V for signs and fixtures, operating safely at temperatures up to 221°F. UL Listed, CSA Certified, and RoHS compliant, this pack of 50 connectors is ideal for industrial use, ensuring corrosion-resistant, durable electrical connections in rugged conditions.

Specifications

ASIN	B00P1UENB6
Best Sellers Rank	#15,775 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #8 in IDC Electrical Terminals
Brand Name	3M
Color	Blue
Connector Gender	Female
Connector Type	Idc
Contact Material	Brass
Customer Reviews	4.8 4.8 out of 5 stars (1,062)
Gauge	14.0
Global Trade Identification Number	00054007092308
Included Components	IDC Connectors
Insulation Material Type	Nylon
Item Dimensions L x W x H	11"L x 6"W x 10.25"H
Item Weight	24 Grams
Manufacturer	3M
Material Type	Brass
Maximum Voltage	1000 Volts
Model	80000209561
Number of Items	50
Part Number	314-POUCH
Specification Met	CSA, RoHS, UL
Temperature Rating	221 degree fahrenheit
Terminal	Idc
UPC	054007092308
Unit Count	50.0 Count

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