hi can anyone help I have a 3 phase bussbar protected by BS 88-2 fuses rated at 630 amps I need to know what is the max Zs allowed for this ?
Discuss Max Zs for Bs88-2 630amp fuse in the Talk Electrician area at ElectriciansForums.net
Reading it, the Lawson ref lists 240V and this may be 230V, if that makes any sense?Cooper Bussmann list it as 0.054 ohms for a 630A BS88 HRC fuse
Accurately measure some 1.5 singles to say 0.10 ohm. Take a Zs at the busbar with meter leads only then take another reading with your known resistance in series with one of the meter leads and then deduct the 0.10 ohm and see if it differs from the original reading. This often works if you are very close to the transformer.And you think the reading is not realistic because of the transformer ? How would you recommend putting a resistance on the circuit bearing in mind it's an open occupied hotel ! Sorry I've never come across this problem and not really tested bussbar
Hi Andy if you could pass this on would be greatOne little word of warning, if you are measuring your Zs very close to a transformer, you may find you get false (high) readings due to the impedance of the transformer windings. I have done a little spreadsheet that will calc the Zs at the incoming terminals of a switchboard fed by a transformer. Let me know if you would like this.
Reply to Max Zs for Bs88-2 630amp fuse in the Talk Electrician area at ElectriciansForums.net
We get it, advertisements are annoying!
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.