About us

SJ Electrical Engineering Co., Ltd.

We specialize in the design and installation of high-voltage (HV) and low-voltage (LV) electrical systems. Our experienced team is continuously trained in technical standards and safety practices. We provide comprehensive services covering installation, inspection, maintenance, and crane operations—delivering reliable, efficient, and safe electrical solutions.

HV / LV

Safety First

Our Services

End-to-End HV & LV Solutions

High Voltage Installation
Pole installation, high-voltage cable stringing, and transformer installation (suspended, on-frame, or ground-mounted), including power line routing to factories, high-rise buildings, and housing projects.
Electrical Relocation & Retrofit
Dismantling old poles and power lines, relocating installations, installing switch blades, and upgrading electrical systems to support factory expansion.
Transformer Installation
Installation of outdoor and interphase transformers with oil cooling systems, including dismantling, replacement, or upgrading to higher-capacity units.
Protection & Safety Systems
Installation of lightning poles, air terminals, grounding systems, and Snake Guards to prevent reptile intrusion, with Partial Discharge inspections.
Inspection & Maintenance
High-voltage equipment inspection, line cleaning, transformer repair, system dismantling, and transformer rental, including outsourcing pole installation for communities.
Accessories Installation
Installation of cover drop-out fuse TR and other high-voltage protection devices.