What is an acceptable megger reading for QMB?
Issue:
Megger readings on QMB
Product Line:
QMB panelboard, switchboard with QMB distribution.
Environment:
Products sold in North America
Resolution:
UL standards do not specify an acceptable megger reading. UL standards require a dielectric voltage withstand test be conducted at twice rated voltage plus 1000V for one minute ( phase to phase and phase to ground).
NEMA standard PB1.1, section 7.4 says a reading of less than 1 meg ohm should be investigated as a possible `` unsafe condition``.
Megger readings on QMB
Product Line:
QMB panelboard, switchboard with QMB distribution.
Environment:
Products sold in North America
Resolution:
UL standards do not specify an acceptable megger reading. UL standards require a dielectric voltage withstand test be conducted at twice rated voltage plus 1000V for one minute ( phase to phase and phase to ground).
NEMA standard PB1.1, section 7.4 says a reading of less than 1 meg ohm should be investigated as a possible `` unsafe condition``.
Released for: Schneider Electric Canada
Need help?
Product Selector
Quickly and easily find the right products and accessories for your applications.
Get a Quote
Start your sales inquiry online and en expert will connect with you.
Where to buy?
Easily find the nearest Schneider Electric distributor in your location.
Help Center
Find support resources for all your needs, in one place.