Appointment
SIP is a self-supporting insulated power wire.
It is used to transfer electricity in a power grid from 220 volts to 35 kV.
The main purpose is to install and connect main power transmission lines and branches from them.
What does it consist of?
The wire has a zero-bearing core. Depending on the brand, it can be insulated or non-insulated.
There are three phase aluminum cores with polyethylene insulation around it.
All the veins are twisted together. They do not have a common shell.
What are the advantages?
Installation of high-voltage lines does not require additional fittings (support insulators).
There is no possibility of wires crossing each other.
Trunk lines take up little space. This is important in urban environments.
Complete safety from exposure to electric current is ensured.
The cable design prevents the accumulation of snow and ice, which contributes to the long-term operation of the network.
Special piercing clamps are used to perform the branches. This eliminates the need to remove the insulation of the cores.
Splicing a wire with a copper wire cable does not create any difficulties or limitations.
There is no possibility of illegal connections or theft of electricity.
The cross-linked polyethylene insulation is a reliable protection against adverse weather conditions.
It has a long service life.
Cable Parameters
Type and cross section
Each type of power cable has its own design and insulation properties made of polyethylene. This determines their purpose and scope of application.
Depending on the size of the cores, cables of various cross-sections are distinguished: 16, 25, 35, 50 mm2, etc. A cable with a cross-section of 16 mm2 is most often used.
Isolation
Special polyethylene is used in cable grades SIPT-1; SIPT-2 and SIP-1 "A", where:
C is self–supporting;
And – isolated;
P – wire;
T – thermoplastic insulation;
1, 2 – type of construction;
A - insulation made of light-stabilized thermoplastic polyethylene.
Insulation including molecular cross-sections in polyethylene is used in the following cables:
- SIP-2 (non-insulated zero core) and SIP-2 "A";
- there is no zero core in the SIP-4;
- there is also no zero core in the SIP-5, the remaining two or three strands are covered with a separate shell of molecular polyethylene.
There is only one insulated aluminum core in the SIP-3 wire. Polyethylene insulation contains particles that protect the wire from the harmful effects of light. It is mainly used for the home.
Specifications
Cables with one, two and four cores are used with a network load of up to 1 kV. For a three-core cable, it increases to 35 kV.
The temperature regime of the gasket is not lower than minus 20 degrees.
Cable operation is possible in a wide temperature range: from minus 500 to plus 500 C.
The warranty period is 5 years.
How do I choose the necessary SIP cable?
Choosing a brand
They choose it depending on what needs it is needed for.
Determination of the number of insulated cores
For a 220 volt single-phase network, zero and phase wires are used. If grounding is necessary, then another wire is additionally installed.
With a 380 volt network load, 4 wires are taken (three of them for phases, one zero) or five: phase wires, ground wire and zero wire.
Grounding is necessary when installing metal structures to protect against electric shock.
Which section should I choose
The cross-section of the cores is selected depending on the load in the network.
With small cross-sections, overheating of the cable cores and damage to the polyethylene insulation are observed. A fire is possible as a result of a short circuit.
If you select too large a cross-section, installation and connection become more complicated, because the connecting devices will not match the power used and the required core cross-section.
Determination of load capacity
To choose the right wire cross-section, it is important to calculate the load in the network.
Then, from the tables with the load characteristics of the wires, the required core cross-section is found.
The maximum permissible load is selected from the table above the calculated power.
When more than one load is connected to the cable, all the capacities add up. Even with a small first deposit, this welcome bonus can make a significant difference in your betting opportunities. New players simply need to use promo code for 1xbet in the registration form to activate this special offer on the 1xBet website or app. The promotion matches your first deposit 100% up to $100, and with the promo code, you effectively receive a 130% boost. This means a $10 deposit becomes $13, a $50 deposit becomes $65, instantly giving you extra funds to wager with. The bonus applies across all sports markets, from pre-match to live betting, with fair wagering conditions.