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Question:

Why some cable tray to spray, what is the role?

Why is the wire hot when a short circuit occurs?

Answer:

General cable tray production are customized 30 meters, 50 meters. And is the rubber and plastic line, the wolf cable type can be based on the requirements around the different meters, and is the national standard rubber cable.
The state does not specify that small plastic lines are generally 100 meters in packaging. The other looks at the size of the disk and the customer's own needs.
Who provided the more to the sub-gave to whom, thank you for helping

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