I have posted this before but have just experienced it again while working at a factory with many old and new isolators and switchfuses.
It seems that not too many sparks are aware of this.
On OLDER metalclad isolators ( MEM especially) with the switch OFF the window shows the colour RED (as in STOP) With the switch ON the window shows the colour GREEN (as in go)
On NEW isolators OFF shows GREEN ( for safe) and ON shows RED (for danger)
Moving from one to the other ,isolating machines etc was causing a bit of confusion with the colours. A quick glance " Oh that one,s off )
It seems that not too many sparks are aware of this.
On OLDER metalclad isolators ( MEM especially) with the switch OFF the window shows the colour RED (as in STOP) With the switch ON the window shows the colour GREEN (as in go)
On NEW isolators OFF shows GREEN ( for safe) and ON shows RED (for danger)
Moving from one to the other ,isolating machines etc was causing a bit of confusion with the colours. A quick glance " Oh that one,s off )