Common Technical Requirements of Connecting Cables of Diesel Genset

Oct. 29, 2021

General technical requirements of users for connecting cables of diesel generator sets.

1. Diesel generator power supply maintenance box

The maintenance power box and power distribution box of all diesel generator sets are series products of the same brand from the same manufacturer. The shape and color of the box shall be unified and coordinated, and the permission of the owner shall be obtained. The box shall be made of glass fiber reinforced polycarbonate. The protection grade of wet indoor places such as grille shall reach IP65, and that of dry indoor places such as power transformation and distribution room shall reach IP41. The box shall be flame retardant, fully insulated, corrosion-resistant, aging resistant and impact resistant. The box adopts modular combination.

2. Diesel generator cable (wire) junction box

When the cross section of the power supply cable does not match with the incoming terminal of the supporting electric control box (cabinet) of mechanical equipment and cannot be directly connected, the diesel generator manufacturer is responsible for providing the cable junction box. The quantity of junction boxes shall be configured by the diesel generator manufacturer according to the actual situation of the supplied equipment, and the cost shall be included in the quotation of cables.

The junction box shall be provided with copper terminal block (or terminal block) for reliable connection of power cables and control cables. The terminal block or terminal block shall meet the requirements of electrical strength under rated and fault conditions, and shall meet the requirements of electrical safety clearance.

All junction boxes are required to purchase products of the same brand from the same manufacturer. The shape and color of the box shall be unified and coordinated in the whole plant, and the permission of the owner shall be obtained. The box shall be the same as the power distribution box.


Shangchai diesel generator


3. Cable for diesel generator

When bidding, the diesel generator manufacturer shall provide the unit price per meter according to the cable specification. When the actual construction cable length exceeds the cable length provided in the bidding, the excess cable cost shall be settled according to the unit price per meter provided in the bidding according to the actual length.

XLPE insulated PVC sheathed power cables shall be used, and XLPE insulated steel tape armored PVC sheathed power cables shall be used for outdoor direct buried laying.

All electrical parameters of the cable shall meet the requirements under its service conditions, and the cable performance shall meet the requirements of national standard (GB) and international standard (IEC).

20% spare capacity shall be reserved for the core of control cable, but the total number of cores shall not be less than 4.

The cross section of control cable of voltage and current measurement circuit shall not be less than 2.5mm2, and that of other control circuits shall not be less than 1.5mm2.

Flame retardant wires and cables shall meet the requirements of national standard GB / t18380.3; Fire resistant wires and cables shall meet the requirements of national standard GB / t12666.6

The period from the date of cable delivery to the date of on-site construction and installation shall not exceed 12 months.

4. Cable tray of diesel generator

Cable ladders and trays shall be hot dip galvanized cable trays.

The position of cable support marked on the construction drawing is only approximate. For example, in order to avoid beams, obstacles and existing facilities, the diesel generator manufacturer can make small changes in the direction and install some elbows and offset devices to suit the actual trend.

The tray of outdoor cable tray is provided with a cover plate, which can shade and avoid dust to protect the cable.

In order to prevent electromagnetic interference and ensure the normal operation of control cables, the bridge used in the project shall be provided with partitions to separate power cables and control cables according to the design requirements.

5.Cable waterproof and fireproof sealing device

The cable waterproof and fireproof sealing device must be adopted at the cable trench of the substation, blower room and dehydration room of the project. The sealing element is composed of metal frame, several sealing modules and a pressing device. The specific method is: firstly, the metal frame is embedded on the wall of the structure through the civil diesel generator manufacturer, and the cable passes through the metal frame, Then peel the core layer of the module according to the different diameters of the cable to match the outer diameter of the cable, then install the module into the frame to clamp the cable, and then insert and fasten the pressing device to form a waterproof seal. In the civil construction stage, the metal frame of the cable plugging device shall be embedded in the wall in time, and the metal frame shall be spot welded with the reinforcement in the wall to ensure the accurate positioning of the metal frame.

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