This photo refers to our380KV double circuit transmission mast , it is single-circuit transmission line, and one phase carries four split conductors. These towers are made of bigger pole section, or several sections combined together.  For this monopole, there are no any cross-arms, and only insulator connected and fixed at monopole itself. At both sides of monopole, one side 380KV and the other side 69KV or 138KV. 

This type of 380KV davit cross-arm single circuit transmission monopole

were produced and combined by solid pipe at large diameter and pole section connection as follow:

(1) Flange connection
(2) Slip joint
(2) Step type
(3) Stagger type
(4) Others

Pole foundation types have:

（1）        Direct embedment

（2）        Anchor bolt

（3）        Based plate

（4）        Vibratory steel caisson

Today, with over 10 years of experience and our commitment to excellence, MEGATRO remains an industry leader in the manufacture and design of steel tubular & angular & monopole structures for all Highway, Municipal, Custom, telecom, lighting and electric Utility applications. MEGATRO has a complete staff of professional engineering personnel trained in the PLS Pole program and three different manufacturing processes for producing steel towers, poles and other supports. We utilize the latest versions of PLS-CADD, PLS-POLE, TOWER, AutoCAD and other CAD software. The structure shall be designed according to load combinations given as per IEC 61936-1 and as illustrated below:
Normal loads
1 Dead weight load
2 Tension load
3 Erection load
4 wind load
 
Exceptional loads
1 Switching forces
2 short-circuit forces
3 Loss of conductor tension
4 Earthquake forces

MEGATRO is one of the few manufactures who assemble a face of

380KV double circuit transmission mast . This attention to quality may not be the cheapest process but it does insure every tower meets our high standards of quality. And it helps to reduce on-site construction cost due to mismatched assemblies. After fabrication all 

380KV double circuit transmission masts are delivered to the galvanizing facility to be Hot DIP Galvanized. Towers are processed through the facility by Caustic Cleaning, Pickling, and then Fluxing. These strict procedures insure years of maintenance free towers. MEGATRO'

380KV double circuit transmission masts systems can accommodate a variety of cross-arm. MEGATRO also offers a wide variety of accessories and mounts. 

Other information:
Availability size: Based on the customer's requirements.
Material: Chinese material or as per clients requirement
Package: Both parties discuss before delivery
Port of Loading: Qingdao Port
Lead Time: One month or based on the customer's needs
Minimum order: 1 set
Fabrication standard: Chinese Standard or other standard which client accepted