I need an outdoor junction box for 12.9mm armoured cable. I see that the holes on this are M20; is there space to drill out to M22?

Hi, thank you for your product enquiry.The knock-outs are 20mm diameter as standard but also have provision to be drilled out to a maximum size of 25mm, so they would be suitable for your requirements.

Are there terminal/conection points inside this junction box, Could really do with a picture of what's inside really.

Yes, there are terminal connectors inside the box. They are comprised of a (loose) strip of ordinary insulated connectors. It all works, 'though I would have preferred the connectors secured to the base of the box, like a junction box.

For the junction box if a cable comes in through the back how do I make it waterproof for water running down the wall?

You can buy a Wiring Grommet Rubber https://www.amazon.co.uk/FIXMAN-255645-Rubber-Grommets-35pce/dp/B01MA6T2HD/ref=alp_dpwidget_a_w_?th=1&psc=1&smid=A3P5ROKL5A1OLE If you search enough you can buy individual. I would suggest you also use a circle of sealant around the box for extra precaution.

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Masterplug WPJB Outdoor Weatherproof Junction Box, 5 Pole Terminal Block, IP66 Rated, Grey

Masterplug WPJB Outdoor Weatherproof Junction Box, 5 Pole Terminal Block, IP66 Rated, Grey

Product ID: 47927949

Details

Brand
Masterplug
Colour
Grey
Material
Acrylonitrile
Product dimensions
5D x 15W x 15H
Style
Outdoor Box 5

📏Compact 15x15x5 cm size

🔌5 pole terminal block for versatile wiring

🛡️IP66 weatherproof & dustproof

€ 22.83

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Weatherproof your wiring with confidence — the pro’s choice for outdoor power!

SEAMLESS INSTALLATION - Colour-matched covers conceal fixing screws for a sleek, professional finish that blends into any outdoor environment.
BUILT TO LAST 25 YEARS - Backed by Nexus’s quarter-century warranty, ensuring durable performance and peace of mind for your projects.
COMPACT YET ROOMY DESIGN - 15x15x5 cm dimensions provide ample space for up to 10mm² wires without bulky overkill.
ULTIMATE OUTDOOR PROTECTION - IP66 rating guarantees total defense against dust and heavy rain, keeping your connections safe come rain or shine.
VERSATILE 5 POLE TERMINAL BLOCK - Supports multiple cable connections with ease, perfect for complex outdoor electrical setups.

The Masterplug WPJB Outdoor Weatherproof Junction Box is a robust, IP66-rated solution designed to protect outdoor electrical connections from dust and water ingress. Featuring a 5 pole terminal block and multiple cable entry points, it offers versatile wiring options within a compact 15x15x5 cm grey ABS enclosure. With colour-matched screw covers and a 25-year warranty from Nexus, it combines durability, functionality, and sleek design for professional-grade outdoor installations.

Specifications

ASIN	B006GAEUC2
Best Sellers Rank	9,769 in DIY & Tools ( See Top 100 in DIY & Tools ) 22 in Surface Mounted Junction Boxes
Brand Name	Masterplug
Capacity	10 millimetres
Colour	Grey
Country of Origin	China
Customer Reviews	4.6 4.6 out of 5 stars (539)
EU Spare Part Availability Duration	25 Years
Finish Type	Painted
Global Trade Identification Number	05015056524290, 05050765022354
Installation Type	Screw-In
Item Dimensions D x W x H	5D x 15W x 15H centimetres
Item Type Name	IP66 Junction Box with 5 way terminal block
Item Weight	0.44 Pounds
Manufacturer	Nexus (Jiaxing)
Material	Acrylonitrile Butadiene Styrene
Model Number	WPJB-01
Number of Items	1
Number of Packs	1
Part Number	WPJB-01
Specification Met	IP66
Style	Outdoor Weatherproof Junction Box, 5 Pole Terminal Block
Unit Count	1.0 count

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