М-20/4 Anchor insert for a lightning rod of 29-31 m

It is used for the installation of detached lightning rods:
– art. M-20/29..31 – 29-31 m high;
– art. M-22/27..29 – 27-29 m high
To install the foundation also use:
– reinforcing steel of class A (ø10 … 14 mm) for the device of a reinforcing grid and a reinforcing framework of ~ 200kg;
– concrete of class B20 ~ 4,8 m3;
– crushed stone ~ 0.8 m3