Published:
18 March 2014
Category:
Q&A
Rob asks this question, which concerns the supply cables to a remote meter, and the size that they should be. It has been answered by Schneider Electric (Theme – Power):
This Q & A is one of thousands posted in our Technical Expertise area, and answered on a daily basis by our Voltimum Experts.
Question: So that we can monitor usage of an area of our site, we will be fitting a remote meter. The supply to be monitored is 200A TPN through 70mm 4C SWA cable, and the meter supply cable from this will be a maximum of 600mm long.
The meter is protected by 1A 'fast blow' fuses in DIN rail-mounted lever action fuse carriers. The terminals have a 4mm capacity, which is obviously not large enough for a 200A rated cable.
Will a 4mm cable be OK to use as a feed to the meter through the fuses?
If not how do I calculate the size needed?
Answer by Merlin Gerin and Square D technical experts: You haven’t supplied the part numbers of the meter and current transformers concerned, but…
…as a general statement, assuming that the current transformer is in the ratio 200/5, the maximum load will be 5A.
The cable size of 4mm is more than adequate for this 5A maximum load.
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