Don’t understand our terminology or a little lost with our acronyms? See the information
below and in the following pages:
|
2N |
Measure of resilience (see pages 2-4) |
|
A |
Ampere (Unit of electrical current) |
|
AHU |
Air Handling Unit |
|
ATS |
Automatic transfer switch |
|
CER |
Central equipment room |
|
CRAC |
Computer Room Air Conditioning |
|
DX |
Direct expansion |
|
EPO |
Emergency Power Off |
|
HV |
High voltage |
|
kVA |
kilo volt amp (unit of electrical power) |
|
mVA |
mega volt amp |
|
MTBF |
Mean time between failure |
|
MTTR |
Mean time to repair |
|
N+1 |
Measure of resilience (see pages 2-4) |
|
PDU |
Power distribution unit |
|
SPOF |
Single Point of Failure |
|
UPS |
Uninterruptible power supply |
Discrimination
This refers to the relationship between the operating characteristics of cables,
fuses and circuit breakers. A system with satisfactory discrimination will clear
an electrical fault quickly and as close to the fault as possible; thus avoiding
unnecessary impact on other circuits/systems.
Failure scenario testing
Failure scenario testing is a procedure adopted in critical environments that comprises
a series of tests undertaken by the Operational Staff for the purposes of familiarisation
with likely critical failures and the procedures necessary to maintain continuity
of engineering systems operation to support the business requirements.