Insulating material Vo

[intense]

Can anyone shed some light on the above material specification . I need to know if what V o actually is ? ie a material type or some to do with flame retardent class for insulating materials?

The above is used in a description for a comb bus bar assembly for single phase mcb distribution.

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[jbartos]

It could be an abbreviation of potentially several materials:
Vypro which is trade name for Polypropylene
Vinyon which is trade name for Polyvinylchloride
Velon which is trade name for Polyethylene HD
etc.
Reference:
Fink D.G. and Carroll J.M. "Standard Handbook for Electrical Engineers," McGraw-Hill Book Co., 10th Edition, 1968, Tables 4.67 and 4.70
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