In order to make your laboratory safer, more beautiful and more practical, I hope the following contents can help you.
1、 The insulation resistance between laboratory wires and between wires is 0.5m ω above.
1. Qualified: the pipes are laid and connected tightly, the pipe opening is smooth, the protection opening is perfect, the exposed pipes and their supports are straight and firm, and they are arranged in order, and there are no obvious wrinkles at the bending of the pipes. The box with the protective layer of concealed pipes with perfect paint and anticorrosion is set correctly and fixed reliably, the pipe entering the box is straight, and the pipe opening of the box (the exposed length of the box is less than 5mm) is fixed, The thread of the nut exposed from the lock nut of the piping is equipped with a compensation device in the deformation seam of 2 ~ 4 buttons. The compensation device can move freely. The connection is tight and firm through the grounding branch line of buildings and equipment. The cross section of the grounding (connecting zero) line is selected correctly. The parts that need anti-corrosion are coated evenly without leakage.
2. Excellent: on the basis of qualification, the laboratory line enters into the electrical equipment and equipment with correct pipe orifice position, the compensation device is flat, the pipe orifice is smooth, the protective opening is firm, the jacket protective tube with reliable connection with the pipe is correctly indicated in the concealed engineering record, the box is clean and free of garbage, the wire is neat, and the protective sleeve (protective opening and protective sleeve) is perfect and does not fall off.
2、 Porcelain clip, porcelain post (bead) and porcelain bottle wiring engineering.
1. Qualified: it is strictly forbidden to twist, dead turn and damage the insulation layer. The porcelain and its bracket shall be firmly installed, the porcelain shall not be damaged, the porcelain bottles shall not be upside down, the spacing between the wire and the porcelain fixing points shall be correct, the bracket shall be painted completely, the wire shall be laid flat and orderly, and the two ends of the wire shall be fixed reliably with the beam, wall, floor, line, etc. which are fixed reliably with the porcelain and pass through the deformation joint of the protective tube
2. Excellent: on the basis of qualification, the porcelain should be arranged in order and evenly spaced. The wires with clean surface should enter the electrical equipment, and the wires with good insulation treatment should be bent and branched in order.
3、 Sheath wiring construction.
1. Qualified: no distortion, death, insulation damage, sheath fracture and other defects are allowed. It is strictly forbidden to directly embed the plastic sheath line into the plastering layer. The sheathed wire shall be laid flat and orderly, and the two ends of the conductor passing through the deformation joints of beams, walls, floors, lines and other buildings with protective pipes shall be fixed reliably. The remaining sheathed wire shall be firmly connected, packed firmly, insulated well, and the joint of the core wire shall be set in the junction box and electrical equipment
2. Excellent: on the basis of being qualified, the open laying part of the conductor is in close contact with the surface of the building, and multiple parallel laying intervals are consistent. The distribution box with neat branches and elbows is in the right position, and the cover is neat and flat. When the conductor enters the distribution box or electrical equipment, there is an appropriate amount of surplus.