Our Voltimum Experts answer your questions on a daily basis in our Technical Expertise area. This one, about cable tray and ladder and the minimum cable CSA required for earth bonding, is answered by SELECT:
|
| Look it up in Table 54.8 (BS7671: 2008). |
|
Question: What is the minimum cross-sectional area of earthing cable required for the earth bonding of cable trays and ladders?
Also, what is the minimum cross-sectional area of earthing cable for the earth bonding of IT cable trays?
Answer: Unless the metal cable support system introduces a potential that does not already exist in the location in which the system is installed, it would not need to be bonded.
However, in practice you would normally bond the cable tray to prevent any potential coming into the building from any another location.
You should use Table 54.8 from BS7671: 2008 (the 17th Edition) to determine the correct size of conductor.
To see many more Q & A in Voltimum UK's Experts Area, please click on the link: www.voltimum.co.uk/consult.php?universe=consult.index.questions
|
BookmarkThis
Back