Old mem mcb type

[graham123]

Hi all, anybody come across these mem mcbs. Don't know what type they are. All it has on them is 3871 part 1. Apologies for the picture will upload a better one tommorow. cannot even find anything on Google or eBay.

 

[spark 68]

Type 1..2.7 - 4In
Type 2..4 - 7In
Type 3..7-10In
Type 4...10 - 50In

Cheers Charlie, I have the curves and other data on this computer somewhere, plus a copy of the 15th Ed.

 

[stefan]

Glad someone finally knows what their talking about thank God

 

[Knobhead]

Hi all, anybody come across these mem mcbs. Don't know what type they are. All it has on them is 3871 part 1. Apologies for the picture will upload a better one tommorow. cannot even find anything on Google or eBay.

Didn't look very hard did you.

 

[graham123]

@tony If you could point me in the right direction Tony on the Internet that would be great!

 

[Knobhead]

Google!

 

[graham123]

Thanks Tony, so can you find any image of these on Google?

 

[graham123]

Better pic for you guys

 

[Anthony S]

Take the offending ones out and look on their sides for the number

 

[graham123]

 

[Anthony S]

Disconnection times need to be met, so if there's no Type number on the device, then you have to make a decision, its that simple.

 

[graham123]

Exactly my only option would be to take worst case senario and they are all type 4. But my max zs would exceed on pretty much every circuit. Limitaion on test sheet as type cannot be verified

 

[graham123]

I also can across some square d qo breakers they also don't have any type on them

 

[Anthony S]

Exactly my only option would be to take worst case senario and they are all type 4. But my max zs would exceed on pretty much every circuit. Limitaion on test sheet as type cannot be verified

Its already on the report is it not ?

 

[spark 68]

As a guess (I know, I know ) they are possibly type 1, looking at the part number it has the Amp rating, then the type and then two letters example; 5 1 EG, I don't suppose MEM themselves are any help ?

 

[Jonspark]

http://www.shepleyelectricalservices.com/Max ZS Table.pdf

does this help?