Non-Class 1E Distribution System

Question 0

State the possible characters for the second position in the electrical distribution system nomenclature.
example: PBA-SO3

Answer 0

A - 13.8 KV
B - 4.16 KV
G - 480 VAC LC
H - 480 VAC MCC
K - 125 VDC
N - 120 VAC INST
E - 4.16 KV DG
Q - 120 VAC UPS

Question 1

State the possible characters for the first position in the electrical distribution system nomenclature.
example: PBA-SO3

Answer 1

N - Non-Class

P - Class

Question 2

State the possible characters for the third position in the electrical distribution system nomenclature.
example: PBA-SO3

Answer 2

A - Train A
B - Train B
C - Train C
D - Train D
N - Non Train

Question 3

State the possible characters for the fourth position in the electrical distribution system nomenclature.
example: PBA-SO3

Answer 3

D - Distribution Panel
M - Motor Control Center (Bus - generally < 50 HP loads)
L - Load Center (generally > 50 HP loads)
S - Switchgear

Question 4

State the possible characters for the last two positions in the electrical distribution system nomenclature.
example: PBA-SO3

Answer 4

The last two numbers are particular to the equipment.

Question 5

What is required for NAN-S01 and NAN-S02 Fast Bus Transfer to NAN-S03 and NAN-S04?

Answer 5

1. The ‘BUS XFR SWITCH’ must be in AUTO
2. Generator trip must have occurred
3. Early ‘b’ contact on NAN-S01 normal supply breaker must
   be closed
4. Synch Check relay must be satisfied
5. No bus lockout (86)