is this suitable for 10 gauge wire

Yes, it can work with 10 gauge wire. Cables Diameters: 4-8mm / 0.16-0.31".

What is the internal dimensions?

I dont have one in front of me, but i used them to splice underground low voltage lights. there was plenty of room to make the straight splice through on the set screw insulated terminals it comes with , then push the wires back out so all you are left with is straight wires and no slack. silicone both ends for added protection and it works great. Not sure how big your needing, but my guess would be i could see 14-uf max . Possibly 12-2 , but i would have to test one first.Hope it helps

LemonBest 2pcs Waterproof Outdoor External 2 Way PG9 Electrical Junction Box Underground Cable Line Wires Power Cord Connector Protection

产品编号: 33548507

细节

Material
Plastic
Brand
LemonBest
Color
Black
Style
Protection
Product Dimensions
1.6"D x 4.5"W

⚡AC 450V Voltage

💧IP65 Waterproof

🔌17.5A Current

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S$24

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描述

🔒 Secure Your Connections with Style!

DURABLE DESIGN - Crafted from high-quality plastic, ensuring longevity and resistance to fading.
COMPLETE PACKAGE - Includes 2 junction boxes, terminals, screws, and waterproof rings for all your needs.
CONVENIENT WIRING - Simplifies the process of connecting outdoor lamps and lanterns.
ULTIMATE PROTECTION - Provides full protection for your cable lines, keeping connections safe and secure.
SEAMLESS INSTALLATION - Easily installable both horizontally and vertically for versatile use.

The LemonBest 2pcs Waterproof Outdoor Electrical Junction Box is designed for durability and safety, featuring an IP65 waterproof rating, high-quality plastic construction, and a complete installation package. Perfect for outdoor electrical connections, it ensures your wiring remains protected and functional for years to come.