YJY cable is a YJV cross-linked insulated power cable with the outer sheath modified to Y polyethylene material, which does not contain harmful halogens. Below, we will explain what YJY cable means, what YJY cable is, and the difference between YJY cable and YJV cable.
1. What does YJY cable mean?
YJY cable stands for copper-core cross-linked polyethylene insulated and polyethylene sheathed power cable. Cross-linked polyethylene insulated power cable is suitable for fixed installation in distribution networks or industrial installations with a power frequency rated voltage of 0.6/1kV and below.
YJY cable characteristics:
1. Power frequency rated voltage: U0/U (Um) 0.6/1 (1.2) kV.
2. The maximum permissible long-term operating temperature of the cable conductor is 90°C.
3. During a short circuit (maximum duration not exceeding 5 seconds), the maximum permissible temperature of the cable conductor does not exceed 250°C.
4. The ambient temperature during cable installation should be no less than 0°C. 5. The cable bending radius must be no less than 15 times the cable's outer diameter.
2. What is YJY cable?
Like YJV cable, YJY cable is a power cable. This type of cable is required for the main line from the substation to the user's home. The model letters in YJY cable have the following meanings:
YJ - Cross-linked polyethylene
Y - Polyethylene
YJY: Cross-linked polyethylene insulated and polyethylene sheathed power cable
The meanings of the various model letter codes in the cable model:
1. Insulation type: V stands for polyvinyl chloride; X stands for rubber; Y stands for polyethylene; YJ stands for cross-linked polyethylene; Z stands for paper.
2. Conductor material: L stands for aluminum; T (omitted) stands for copper.
3. Inner sheath: V stands for polyvinyl chloride sheath; Y stands for polyethylene sheath; L stands for aluminum sheath; Q stands for lead sheath; H stands for rubber sheath; F stands for neoprene sheath.
4. Features: D stands for non-drip; F stands for phase separation; CY stands for oil-poor dry insulation; P stands for shielding; Z stands for direct current. 5. Control layer: 0: None; 2: Double steel belt; 3: Fine steel wire; 4: Thick steel wire.
6. Outer sheath: 0: None; 1: Fiber sheath; 2: PVC jacket; 3: Polyethylene jacket.
7. Flame-retardant cables are preceded by ZR; fire-resistant cables are preceded by NH; and fire-resistant cables are preceded by DH.
III. Differences between YJY and YJV cables
1. The sheath material of YJY is polyethylene, which does not contain toxic halogens; while the sheath material of YJV is polyvinyl chloride, which contains toxic halogens.
2. V polyvinyl chloride cannot be cross-linked, while Y polyvinyl chloride can be cross-linked (after cross-linking, the "E" can be replaced by "Y").
3. PVC-sheathed cables are used in general applications, while YJY polyvinyl sheathed cables are used in enclosed or crowded locations, such as subway stations, large shopping malls, and larger underground business halls. 4. Before the copper price increase, YJY cable was approximately 20% more expensive than YJV (for small and medium cross-sections). Now, the price is less than 10%.
5. The former produces a large amount of harmful gases in a fire environment and can only be used in generally safe environments. The latter produces little or no harmful gases in a fire environment and is used in crowded places (such as shopping malls and conference halls). This type of cable is generally called "halogen-free, low-smoke power cable."
6. YJY is better than YJV in terms of water resistance and low-temperature resistance.
7. YJV is better than YJY in terms of flame retardancy.
8. In terms of price, there is little difference between YJV and YJY. However, the price of cross-linked polyethylene (XLPE) is higher than that of polyvinyl chloride (PVC), so YJY is slightly higher than YJV. More information about YJY cable.
