Emerson 510 Manuel D’Utilisation

Installation, Operation and Maintenance Manual

 

4

 

IO-70103 Rev 0, 1/2013

 

Surge Protective Devices

 

  

  

All electrical connections should be installed by a qualified 
(licensed) electrician only.   All wiring must comply with the 
National Electrical Code (NEC) and applicable local 
codes.

    

 

  

Before making connections to the unit, verify that the unit 
model number and nameplate voltage rating are 
appropriate for connection to the intended power source. 
See the chart on page 3 for voltage rating applications 
with typical power source configurations.

    

With parallel connection, the size of 

the wiring to the SPD unit is independent of the protected 
circuit s ampacity. NEC Article 285-21(B) requires surge 
suppressor connecting conductors to be at least #14 
copper or #12 aluminum.  To reduce the wiring impedance 
to surge currents, it  is  recommended that  the phase, 
neutral (if required), and  ground  conductors  are  twisted 
together  and  routed  in the same raceway (conduit). Avoid 
any sharp bends in the conductors.

 

The SPD unit conducts 

practically no current under normal operation and only 
conducts very short duration transient surge currents.

 

NEC Considerations - The following is from the National 
Electric Code 2008 Edition.

 

 

NEC 285.23 Type 1 SPD s. Shall be installed in 
accordance with 285.35(A) and (B).

 

(A) Installation. Type 1 SPD s shall be installed as 
follows:

 

(1)  Type 1 SPD s shall be permitted to be connected to 
the  supply  side  of  the  service  disconnect  as 
permitted  in

 

230.82(4) or

 

(2)  Type  1  SPD s  shall  be  permitted  to  be 
connected  in Type 2 locations as specified in 285.24.

 

(B) At the service. When installed at the services, the 
grounding conductor of a Type 1 SPD shall be connected 
to one of the following:

 

(1) Grounded service conductor

 

(2) Grounded electrode conductor

 

(3) Grounding electrode for service

 

(4)Equipment grounding terminal in the service equipment

 

To obtain the voltage 

protection ratings (VPR s), as obtained by Underwriters 
Laboratory,  Incorporated,  in  accordance  with  the  Standard 
for Safety, Surge Protective Devices (SPD s), Standard 1449, 
Third Edition, released (2009), marked on this product, the 
wire size listed for each product must be utilized to connect 
the unit to your facilities

 

power grid. Connections made with 

conductors other than the wire size listed may result in 
different VPR s.

 

Representative samples of 

these products have been investigated by Underwriters 
Laboratories,  Incorporated  to  withstand,  without  exposing 
live circuits or components at system voltages and fault 
currents up to 200,000 AIC, as described in the Standard for 
Safety, Surge Protective Devices (SPD s), Standard 1449, 
Third Edition, released (2009).

 

The performance and 

safety of any SPD system is dependent on proper grounding 
and bonding. Grounding is required for safety. Correct 
implementation also enhances equipment performance. 
Incorrect grounding can reduce or impede the SPD s 
operation.

 

All electrical circuits to the SPD must include an equipment- 

grounding conductor as 
required by the NEC and local 
codes. 

 

An insulated grounding conductor is required in addition to any 
metallic raceway, which may be used as a grounding conductor. 
For parallel-connected SPDs, the grounding conductor should 
be  the  same  wire  size  as  the  associated  power 
conductors.