Max Earth Fault Loop Impedance

[Hp1]

Hi,
Can anyone advise me where i can find the max EFLI for a BS 1361 35A consumer Unit fuse fitted in a MEM Memera Switch disconnector.

Manmy Thanks

Harry

 

[JohnD]

http://www.tlc-direct.co.uk/Book/5.3.4.htm

But 35A fuse???? can you show us a picture of it? And of the Switch Disconnector too How old is it? Do you know the part no?

 

[Spark123]

They do make a 35A fuse, the information isn't very easy to find. They may even be a BS88. Might be better to give MEM technical a phone, is it part no LC35 ?

 

[Hp1]

Hi,

It is a BS1361, Unfortunately I did not take a picture. They do make 35a see the link
http://www.thefusecompany.com/fuse.php?cPath=42&products_id=137&sid=7c45cbfef3cab9575800dbac8896f521

I will ring NAPIT and ask them for the value in the morning.

I came across this when carrying out a PIR and need the value so i can check book value against measured value. I'm very surprised I can't find this info somewhere on line. Thank you John d and spark123 for your help.

Harry

 

[Spark123]

There is a time/current curve graph here: http://www.memonline.com/time05.html

 

[Hp1]

Thank you spark123.

much appreciated

Harry

 

[Hp1]

Hi Spark123,
Looking at the 0.4s disconnection time I make Zs = 230/200 i.e 1.15 Ohms or 0.92 Ohms as an 80% figure. Would you agree.

Once again many thanks

Harry

 

[Spark123]

Looks OK to me! Worth double checking with Napit though. Might be they still use 240v as in the 16th edition.

 

[Hp1]

Hi Spark123,

I think your right until 1 July we need to calculate using 240v ( Open circuit voltage at Tx).

Harry