bigger than a cu

[i=p/u]

was woking with panel today that these circuit breakers
http://www.mebamfg.com/pdf/NF250-CS-Moulded-Case-Circuit-Breaker.pdf

can you use one side as a live feed to another circuit breaker

what is bs numbers for these circuit breakers is it bs 4752

you can set the I (amps) with a dial and there is a red button to test the thermal magnetic disconnection

big board than normal for me

 

[i=p/u]

so it says 100A 3p which is really 300A in total but will trip if one phase reaches the 100A. i will hang him but im doing me best

You got it, 100A per phase.

Look at it another way, it’s a house with a 300A single phase service head. Same ****e different location. Bigger bang!

Don’t worry about it, it’s the worse thing you can do. You’ve tested live before, you know to keep your pinkies out of harms way. Use your common sense.

BUT do not go in to the main incoming cubical without supervision, two heads are better than one. If you feel uncomfortable with something, say so and stop.

 

[brucelee]

what page in gn3 is this... cant be in gn3, cant cant cant, isit in the new wiring regs under different class

Hi mate what is the BS number for the CBs you want the max Zs values for

sorry mate just re read your initial post and the vaues i have given you are for bs 3871 sorry mate
lol

 

[i=p/u]

yeah for bs 3871 type2 m9

 

[brucelee]

then they are the values and are on page 111 GN3

 

[brucelee]

they are also in the old OSG page 103 to a 100A max fuse size
and the elecys guide to building regs i think
there is a lso a pdf of all fuses on the forum somewhere

 

[i=p/u]

chicken and ham good man. you ever find that pdf id be interested and greatfull...

as we all know out on site is worth ten times a classromm

 

[i=p/u]

just checking brucelee, that when asks for max permitted id multiply gn3 max by 1.2

 

[Richard Burns]

chicken and ham good man. you ever find that pdf id be interested and greatfull...

as we all know out on site is worth ten times a classromm

These are some of the Zs references I have gleaned from the forum:
View attachment Zsflyers.pdf
View attachment ZS values - maximums.pdf
View attachment Zs values for older protection devices.pdf

 

[i=p/u]

Thank you Mr Burns. i will add to my collection, even tho ive never heard of some of them. but ty

 

[i=p/u]

comes to my next question..... the circuits im testing tomorro are all in service already and mostly on double pole rcbos. i cant insulation resistance the full board in one go can i , even tho is only a coil?????

 

[i=p/u]

guys, the boss hasnt give me an r1+ r2 socket with test equipment, can i just get a plug and drill 3 small holes init and use this,#

your views please

 

[Richard Burns]

guys, the boss hasnt give me an r1+ r2 socket with test equipment, can i just get a plug and drill 3 small holes init and use this,#

your views please

Please don't, not really safe at all. Just ask your boss for a test socket.

 

[i=p/u]

even tho only for dead testing..., i can remove items for live testing... but agree should have all equipment im use too

 

[i=p/u]

hmm hmm