Activity 2: Protection Against Electric Shock

Automatic disconnection of supply may be used as protection against electric shock.

• True

• False

Protective earthing and bonding can be utilised for basic protection.

• True

• False

A step-up transformer may be used to supply an SELV source.

• True

• False

A circuit protected by an RCD on a TT system shall satisfy the following condition: Rₐ × IΔn ≤ 50V.

• True

• False

A barrier may be employed as a means of basic protection.

• True

• False

Fault protection may be assured by insulating live parts.

• True

• False

A 30mA RCD may be utilised as additional protection if basic protection fails.

• True

• False

Contact with live parts can be prevented by fitting barriers.

• True

• False

A TT system has a nominal voltage of 230V a.c. to earth and should have maximum disconnection time of 0.2 second.

• True

• False

Insulation of live parts would be utilised for fault protection purposes.

• True

• False