Flame-retardant
Flame-retardant self-supporting wire with an insulated neutral core
SIPn-2 is a version of SIP-2 with flame-retardant insulation. 3 insulated phase conductors + an insulated neutral messenger of aluminium alloy; the insulation is flame-retardant UV-stabilised cross-linked polyethylene. It is used for 0.4 kV trunk overhead lines with enhanced fire safety requirements and for the reconstruction of existing lines.
A version of SIP-2 with flame-retardant insulation. The geometry and cross-sections are identical to those of SIP-2.
| Type / size | Cores | Neutral cross-section, mm² | Outer Ø, mm | Weight, kg/km |
|---|---|---|---|---|
| SIPn-2 3×16+1×25 | 3+1 | 25 | 19 | 220 |
| SIPn-2 3×25+1×35 | 3+1 | 35 | 21.5 | 310 |
| SIPn-2 3×35+1×50 | 3+1 | 50 | 24 | 420 |
| SIPn-2 3×50+1×54.6 | 3+1 | 54.6 | 26.5 | 540 |
| SIPn-2 3×70+1×70 | 3+1 | 70 | 28.5 | 720 |
| SIPn-2 3×95+1×70 | 3+1 | 70 | 30.5 | 860 |
| SIPn-2 3×120+1×95 | 3+1 | 95 | 34 | 1080 |
| SIPn-2 3×150+1×95 | 3+1 | 95 | 36.5 | 1250 |
SIPn-2 is a modification of SIP-2 with flame-retardant insulation. The index “n” in the designation per GOST 31946-2012 (Amendment No. 1) means that the UV-stabilised cross-linked polyethylene of the insulation is made of a flame-retardant compound. The conductors, cross-sections and mechanical characteristics are the same as for SIP-2: the maximum conductor temperature is +90°C in normal operation and +250°C under short circuit.
Like SIP-2, it has an insulated neutral messenger. The difference is its behaviour in a fire: the insulation does not support the propagation of flame along the wire, which is important for installation on building facades and in densely built-up areas.
The wire is intended for the same lines as SIP-2 — 0.4 kV trunk overhead lines — but with enhanced fire safety requirements.
Phase conductors (3 pcs)
Stranded, of aluminium alloy.
Insulated neutral messenger
Of aluminium alloy. Carries the mechanical load.
Insulation
Flame-retardant UV-stabilised cross-linked polyethylene (XLPE).
Stranding
The phase conductors are stranded around the insulated neutral messenger.
Cross-section of SIPn-2 – 3 phases + an insulated neutral in flame-retardant insulation
Detailed specifications are given in the TCG datasheet
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