# Safe Use Of Electricty Under Water Flashcards

What time frame must a protected circuit be?

20 milliseconds

30mA

Irrespective of voltage,( 50v +) how many ohms is a typical worst case figure for limb to limb contact on a diver?

500 ohms

If the voltage was 50v or less, what’s is the max amount of ohms considered safe for a diver?

750 ohms

What voltage is considered to be classed as high voltage?

A) 750 V

B) 1000V

C) 1500V

D) 2000V

B) 1000V

What voltage is considered to be classed as a low voltage?

A) any voltage up to 50V

B) any voltage up to 100v

C) any voltage up to 150v

A) any voltage up to 50V

What are the voltage ranges, to be considered for medium voltage?

50v-1000v

How many volts would be considered to be classed as ultra high?

30,000v

In diving, what is considered to be a safe range of frequency for a diver?

A) 40-50 Hz

B) 50-60 Hz

C) 50-70 Hz

D) 40-100 Hz

B) 50-60Hz

What is the maximum voltage for a diver on a dc circuit without a trip device?

30v

What is the normal voltage for a diver on a dc circuit without a trip device?

24 volts

What is the maximum voltage for a diver on an ac circuit without a trip device?

7.5 volts

What is the normal voltage for a diver on an ac circuit without a trip device?

6 volts

What is the maximum voltage for a diver on a dc circuit with a trip device?

285v

What is the normal voltage for a diver on a dc circuit with a trip device?

250 Volts

What is the maximum voltage for a diver on an ac circuit with a trip device?

250 volts