Delta MCS-1800 Specifications download pdf (Page 66)

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APPLYING SURGE PROTECTORS

Figure 2. Typical Installation of Equipment within a Small

Area

• Ground wires to the suppressors are very short.

• An optional (depending on code) ground conductor

connects the ground bus to the main building power

ground. This conductor may be quite long, but that does

not create a problem now that the ground area has been

established.

Protecting Multibuilding Data and Control Systems

The Protection Zone Concept can also be applied to

multibuilding, multidrop data and control systems. In Figure

3, the surge protectors located at the building entrance are

improperly positioned to protect the CPU and the controllers.

During lightning activity, ground potentials at opposite ends

of a building can be thousands of volts, causing damage

to electronic equipment. Also, surge protectors for data

lines that enter buildings have series resistance. The series

resistance of the surge protectors is additive. The total series

resistance often is too great and can cause communication

or data line problems. The installation in Figure 3 shows ﬁve

protectors in series over the length of the data line.

To properly configure surge protection on a multibuilding,

multidrop system (see Figure 4), connect the surge protector

on each controller drop so that the protector is not in series

with the main data line. When connected in this manner,

no more than two surge protectors are connected in series.

Using the Protection Zone Concept, locate the data line

surge protectors within the protection zone window along

with an AC service outlet surge protector for each respective

controller. Remember to keep the ground connections to the

single point ground very short.

Summary

Remember the following when applying surge protection:

1. Keep all grounds inside the protection zone at the same

potential. If different ground potentials are present on

electronic equipment, damage will occur regardless of

the suppression used.

2. Protect all electrical and data circuits entering or leaving

the protection zone at the protection zone ground

window. Doing this keeps circuits at a safe voltage with

respect to the ground window. This safe voltage is the

clamp voltage (let-through voltage) of the respective

suppressors.

The majority of surge protection installations are fairly simple

and only involve bonding suppressor grounds to AC service

grounds at the ground window. Existing sites may involve

some rewiring to accomplish the best results. In order to

keep the data line surge suppressor ground and AC service

ground wires very short, wiring must sometimes be moved.

When applying surge protectors, using the Protection Zone

Concept will effectively protect EMS and BAS installations.

Data

Ground

Data Line

Surge Protector

Data Line

AC Power

Ground #2

Data Line

AC Power

Ground #1

Ground #3

AC Power

The Protection Zone

AC Outlet #1

AC Outlet #3

AC Outlet #2

Building 1

CPU

Building 2

C C

Data Line

Building N

C CC

CPU

Main Processing Equipment Distributed EMS/BAS ControllersSurge Protector

Figure 3. Improper Positioning of Surge Protectors

Building 1

Building 2

Building N

CPU

Main Processing EquipmentDistributed EMS/BAS Controllers

AC Power

CPU

AC Power

Data

Line

AC Power

Conductor from data line SP ground and AC power

SP ground to single point ground must be very short

Power

Surge Protector

Model HSP-121BT1RU AC Power Surge Protector

Model PC642C Data Line Surge Protector

Figure 4. Proper Positioning of Surge Protectors

March 2014

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Delta MCS-1800 Specifications Page 66

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