UNDERGROUND CONSTRUCTION
FRAMES & COVERS, CARRIAGEWAY No. 3, 3A, 3C & 3D

Frames and Covers, Carriageway No. 3, 3A, 3C & 3D

Frames and Covers, Carriageway No. 3
Double-triangular type 27" x 72" clear opening for use on each carriageway joint boxes. Six covers are required.

Fitted with Covers, Carriageway No. 2.

Frames, Carriageway No. 3 was made obsolete in 1984.

Frames and Covers, Carriageway No. 3A
Double Triangular Type 27" x 72" clear opening for use each on carriageway joint boxes. Heavy Duty design where traffic loading conditions are severe. Six covers are required.

Cover made of Spheroidal Graphitic Iron marked HD.

Frames and Covers, Carriageway No. 3C
Double Triangular Type 27" x 72" clear opening for use each on carriageway joint boxes. Heavy Duty design where traffic loading conditions are severe. Six covers are required.

Cover made of Spheroidal Graphitic with improved design.

Frames and Covers, Carriageway No. 3D
Double Triangular Type 27" x 72" clear opening for use each on carriageway joint boxes. Thought to be of a later design.