In Indonesia, the phase (live) wires are color-coded as black (L1), brown (L2), and grey (L3), carrying the electrical current from the power source to the load.

Phase Wire Color Standards

Indonesia follows the PUIL 2011 standard, adapted from IEC 60446, for electrical wiring color codes:

• Black wire (L1): The primary phase wire used in most household circuits, carrying live current from the substation into the building. It should never be used as neutral or ground .
• Brown wire (L2): Typically used for higher power applications, such as machine operations or commercial installations .
• Grey wire (L3): Serves as an additional phase wire for modern commercial and industrial needs, providing higher electrical capacity .

Neutral and Ground Wires

• Blue wire: Neutral wire, negatively charged or near zero, returning current to the source and serving as a reference point in the circuit .
• Green-yellow wire: Ground wire, providing a safe path for excess current to prevent electric shock or equipment damage .

Electrical System Overview

• Voltage and frequency: Indonesia uses 230 volts at 50 Hz .
• Plug types: Standardized on Type F sockets, compatible with Type E and C plugs, but Type F is required for grounding safety .
• Safety compliance: Electrical installations must comply with SNI (Indonesian National Standard) to ensure safety, reliability, and legal compliance .

Practical Notes

• Always verify the wire color before connecting, as incorrect connections can cause electric shock, short circuits, or fire hazards.
• For industrial or multi-phase systems, L1, L2, and L3 allow three-phase power distribution, which is common in commercial and industrial settings.
• Older installations may have outdated color codes; modern rewiring typically follows the PUIL 2011 standard . Understanding these standards ensures safe and compliant electrical installations in Indonesia, whether for residential, commercial, or industrial applications.