Whats The Minimum Insulation Resistance Of Selv Circuit?

[buddha]

the smart screen test says its anything equal or greater than 0.25 M ohms,the red regs book says equal to or greater than 0.5M ohms????????????

 

[SPECIAL LOCATION]

Table 61 in both Red book pg 158, and green book pg 191  state  SELV minimum 0.5Mohms

it was the Brown book Table 71A page 173 that stated 0.25Mohms...

{in all cases test voltage is @ 250v}

looks like Smart Screen ain't so "Smart"

opcorn

p.s.  you should be using the Green book now! :innocent

 

[buddha]

thanks,our teacher gave us this question answer sheet with this on it,(as if things arent confusing enough haha).

I will get the green book when i get some cash,are there many differences?

 

[Joseph Howarth]

only 100 or so changes and additions. Mainly some more special locations and lightning / SPD protection

I've been taught 0.5 Mohms for SELV

 

[buddha]

thanks

 

[Sidewinder]

There are MORE than 100 changes, it would be easier to count the number of pages that do not have changes between the current & last version!

 

[buddha]

There are MORE than 100 changes, it would be easier to count the number of pages that do not have changes between the current & last version!

better get down the shop and get the green book then,are things like maximum Zs readings different,how much is a new green regs book?

 

[Technician]

When you have the new book, look in the margin for

a thin black vertical line.  That indicates where there

has been a change from the previous version to the

new.

 

[elec dept]

When you have the new book, look in the margin for

a thin black vertical line.  That indicates where there

has been a change from the previous version to the

new.

Never even noticed those lines until you mentioned them!! Learn something new every day!

 

[buddha]

When you have the new book, look in the margin for

a thin black vertical line.  That indicates where there

has been a change from the previous version to the

new.

thanks mate