There are MC4 Style Branch Connector Cables which are approved by CE, TUV, UL etc.
This Y Style MC4 compatible Solar Cable Connector Set is a perfect solution to parallel connect multiple panels together in a solar field, and is typically used in parallel applications.
Easy to install and easy to use.
Product Name: Solar Panel Connector; Package Content: (1 x 2 Male to 1 Female + 1 x 1 Male to 2 Female) Connector
Type: Y Type(1 to 2); Net Weight: 120g
Material: PA, PC; Main Color: Black
Total Length: 35cm/ 14"; Ingress Protection Rating: IP67
Cable Type: PV1-F; Rating Voltage: DC 1000V, AC 600V/1000V