Preparation before installation:
Planning and design: Determine the complete pipeline route and list all required accessory types and quantities.
Check materials: Ensure that conduits, cable trays, and fittings are all made of PVC-U material and have matching dimensions.
Preparation tools: PVC pipe cutter or saw (for cutting), file (for deburring), PVC special adhesive, cleaning cloth, ruler, pencil, level ruler, electric drill (for fixing pipe clamps).
Safety first: Ensure that the work area is powered off.
Installation steps (taking adhesive catheter system as an example):
Cutting and processing: Cut the catheter to the desired length, thoroughly remove burrs on the inner and outer edges with a file, and ensure that the incision is level.
Dry assembly inspection: Pre assemble all conduits and fittings without applying glue, check if the path is correct and if the fittings are in place.
Cleaning and gluing: Use a cleaning cloth to wipe away dust and oil stains from the outside of the conduit port and the inside of the accessory socket. Apply a layer of PVC special adhesive evenly on the outside of the catheter port, and also apply a thin layer on the inside of the accessory socket.
Connection and fixation:
Immediately insert the catheter into the fitting socket, rotate slightly to ensure even distribution of glue, and hold tight for a few seconds.
After bonding, the angle and position should be adjusted quickly, as the glue solidifies quickly (usually within a few seconds of initial fixation).
During the curing period of the bonding point (usually 2-5 minutes according to the adhesive instructions), use pipe clamps to securely fix the piping system to the wall or bracket. The spacing between fixed points should comply with the specifications (for example, about one fixed point every 1 meter for a straight section of a Φ 20 pipe).
Installation of special accessories:
Box fitting: One end of the fitting is glued or screwed into the conduit, and the other end is threaded through the knock off hole in the bottom box and secured with a locking nut inside the box.
Cable trunking system: The bottom box of the cable trunking is usually fixed with screws, and the accessories and cable trunking are often connected by snap fit or screws, with the cover plate fastened at the end.
Wiring: After the entire pipeline system is firmly installed and the glue is completely cured (usually after 24 hours), the threading operation can be carried out.
Important precautions:
Correct use of adhesive: PVC-U special adhesive (solvent based) must be used instead of ordinary adhesive. Apply evenly and in moderation to avoid excessive flow into the tube.
Environmental ventilation: Maintain good ventilation during adhesive application to avoid inhaling volatile gases.
Thermal expansion: When laying in a long straight line, the thermal expansion coefficient of PVC should be considered, and expansion joints should be installed if necessary.
Grounding continuity: The PVC-U piping system itself is an insulator and does not provide a grounding path. Therefore, an independent grounding protection wire (PE wire) must always run through the pipeline, and all metal equipment (such as switch boxes, lamps) must be reliably grounded through this PE wire.
Compliance with regulations: The entire installation must strictly comply with local electrical installation regulations and standards.