Insulation Condition Test

What is insulation resistance?

The resistance to current leakage through and over the surface of insulation.

Insulation resistance value in a complete circuit must be

At least 1 Megohm

Insulation Resistance value in a lightning circuit must be

0.5 megohm

What cutters must maintain a machinery history

65 feet and longer

When equipment is transferred what must transfer with it?

All related machinery history including resistance test record cards

What happens when insulation of resistance windings on rotating machinery decreases?

The temperature of the winding insulation increases

What does a nomograph do?

Correction for tempature

What is the NAVSHIPS Form 531

Record resistance measurements of electrical equipment

What are the two important contents of machinery history?

Important information

Keep non-essential data out

What happens to insulation resistance when insulation absorbs moisture

Resistance decreases

Factors that affect insulation resistance?

Construction, Moisture, Temperature, Cleanliness, Condition of Insulation

How many volts does megohm meter operate with?

500 volts