ෂෙන්හායි පිපිරුම්-සාධනය
විදුලි උපකරණ ඇගයීමේදී, it’s essential to thoroughly check the following:
1. පුපුරන සුලු පරිසරයක උපකරණ ක්රියාත්මක කිරීම.
2. උපකරණවල සුදුසු වර්ගීකරණ මට්ටම.
3. Accuracy of the electrical equipment’s thermal group classification.
4. විදුලි සහ රැහැන් ලේබලවල නිවැරදි බව.
5. Validity of labels on electrical equipment and wiring.
6. Compliance of enclosures, transparent components, metal seals, or adhesives with requirements.
7. Any visible, unauthorized alterations.
8. Proper and secure fastening of bolts, cable entry mechanisms (whether direct or indirect), and blanking plates.
සටහන: For d and e type devices, transparent components made of tempered glass must not be replaced arbitrarily. Only original parts should be used to meet the strength requirements for d type devices and the sealing requirements for e type devices.
9. Cleanliness and integrity of explosion-proof surfaces and linings (ඈ).
10. Gap sizes on explosion-proof surfaces remaining within permissible limits (ඈ).
11. Correctness of luminaire light source’s rated power, ආකෘතිය, and installation position.
සටහන: Luminaires with the same power but different models vary in heat output and components, and should not be replaced without consideration. උදාහරණ වශයෙන්, LED luminaires have high start-up temperatures, as do bulbs in other types of luminaires.
12. Security of electrical connections.
13. Condition of the enclosure lining.
14. Integrity of sealed and airtight circuit breakers.
15. Proper functioning of the restricted-breathing enclosure.
සටහන: The IP rating requirements are stringent, requiring the internal pressure of the device to remain stable under vacuum conditions.
16. Sufficient space between the motor fan and the enclosure or cover.
සටහන: The spacing should exceed 1% of the impeller diameter but be less than or equal to 5mm.
17. Adherence of breathing and draining devices to standards.
සටහන: Breathers and drainers are often specialized components in the explosion-proof chamber of “ඈ” type gas detectors. These devices come in various structures, including dust metallurgy, multi-layer metal mesh, rolled film, and labyrinthine designs.
18. Certification of safety barrier units, රිලේ, and other limited energy devices as explosion-proof, along with proper installation and භූගත කිරීම (i).
සටහන: Even though explosion-proof barriers are typically used in safe areas, they require specific certification.
19. Installation of intrinsic safety devices as per documentation specifications (pertains only to fixed equipment) (i).
20. Cleanliness and absence of damage on intrinsic safety device circuit boards (i).
21. Absence of defects like cracking in encapsulated shell materials (මීටර්).
සටහන: The symbols in parentheses at the end of each checklist item denote the specific පිපිරුම්-ප්රතිරෝධී වර්ගය to which the item applies. Items without parentheses are applicable to all explosion-proof types.